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Yang Q, Zheng W, Zhao Y, Shi Y, Wang Y, Sun H, Xu X. Advancing dentin remineralization: Exploring amorphous calcium phosphate and its stabilizers in biomimetic approaches. Dent Mater 2024; 40:1282-1295. [PMID: 38871525 DOI: 10.1016/j.dental.2024.06.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2024] [Accepted: 06/05/2024] [Indexed: 06/15/2024]
Abstract
OBJECTIVE This review elucidates the mechanisms underpinning intrafibrillar mineralization, examines various amorphous calcium phosphate (ACP) stabilizers employed in dentin's intrafibrillar mineralization, and addresses the challenges encountered in clinical applications of ACP-based bioactive materials. METHODS The literature search for this review was conducted using three electronic databases: PubMed, Web of Science, and Google Scholar, with specific keywords. Articles were selected based on inclusion and exclusion criteria, allowing for a detailed examination and summary of current research on dentin remineralization facilitated by ACP under the influence of various types of stabilizers. RESULTS This review underscores the latest advancements in the role of ACP in promoting dentin remineralization, particularly intrafibrillar mineralization, under the regulation of various stabilizers. These stabilizers predominantly comprise non-collagenous proteins, their analogs, and polymers. Despite the diversity of stabilizers, the mechanisms they employ to enhance intrafibrillar remineralization are found to be interrelated, indicating multiple driving forces behind this process. However, challenges remain in effectively designing clinically viable products using stabilized ACP and maximizing intrafibrillar mineralization with limited materials in practical applications. SIGNIFICANCE The role of ACP in remineralization has gained significant attention in dental research, with substantial progress made in the study of dentin biomimetic mineralization. Given ACP's instability without additives, the presence of ACP stabilizers is crucial for achieving in vitro intrafibrillar mineralization. However, there is a lack of comprehensive and exhaustive reviews on ACP bioactive materials under the regulation of stabilizers. A detailed summary of these stabilizers is also instrumental in better understanding the complex process of intrafibrillar mineralization. Compared to traditional remineralization methods, bioactive materials capable of regulating ACP stability and controlling release demonstrate immense potential in enhancing clinical treatment standards.
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Affiliation(s)
- Qingyi Yang
- Department of Periodontology, School and Hospital of Stomatology, Jilin University, Changchun 130021, PR China; Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, School and Hospital of Stomatology, Jilin University, Changchun 130021, PR China
| | - Wenqian Zheng
- Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, School and Hospital of Stomatology, Jilin University, Changchun 130021, PR China
| | - Yuping Zhao
- Department of Periodontology, School and Hospital of Stomatology, Jilin University, Changchun 130021, PR China; Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, School and Hospital of Stomatology, Jilin University, Changchun 130021, PR China
| | - Yaru Shi
- Department of Periodontology, School and Hospital of Stomatology, Jilin University, Changchun 130021, PR China; Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, School and Hospital of Stomatology, Jilin University, Changchun 130021, PR China
| | - Yi Wang
- Graduate Program in Applied Physics, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA
| | - Hongchen Sun
- Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, School and Hospital of Stomatology, Jilin University, Changchun 130021, PR China
| | - Xiaowei Xu
- Department of Periodontology, School and Hospital of Stomatology, Jilin University, Changchun 130021, PR China; Jilin Provincial Key Laboratory of Tooth Development and Bone Remodeling, School and Hospital of Stomatology, Jilin University, Changchun 130021, PR China.
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Zheng S, Chen H, Lin Q, Zhu S. Effect of dentin conditioners on dentin bond strength: A systematic review and meta-analysis. J Prosthet Dent 2024:S0022-3913(24)00421-9. [PMID: 38981805 DOI: 10.1016/j.prosdent.2024.05.038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Revised: 05/29/2024] [Accepted: 05/31/2024] [Indexed: 07/11/2024]
Abstract
STATEMENT OF PROBLEM Although composite resin restorations have been widely used for dental restorations, the durability of the bond affects the rate of restoration failure. However, how multiple strategies for enhancing the resin-dentin bond affect durability is unclear. PURPOSE The purpose of this systematic review and meta-analysis was to evaluate the impact of dentin conditioners on resin-dentin bond strength with different pretreatments before the application of adhesives. MATERIAL AND METHODS The PubMed, Web of Science, EMBASE, and Cochrane Library databases were searched from 2013 to July 2023 for in vitro studies that evaluated the impact of dentin conditioners on resin-dentin bond strength. The meta-analysis was conducted using a random-effects model with pooled effect as standardized mean differences (α=.05). RESULTS A total of 23 studies met the inclusion criteria for qualitative analysis, of which 15 were used for quantitative analysis. The results demonstrated that, under dry bonding conditions, selective extrafibrillar demineralization dentin conditioners significantly enhanced the immediate bond strength (P<.001). The long-term bond strength was limited by the sample size of the subgroup, but a significant effect was found after using selective extrafibrillar demineralization dentin conditioners (P<.001). However, metal salt-based dentin conditioners improved the immediate bond strength only under wet bonding conditions (P=.010). Notably, acid-based dentin conditioners significantly improved the long-term bond strength under both dry and wet bonding conditions (P<.001 and P=.006). CONCLUSIONS The application of acid-based dentin conditioners significantly improved resin-dentin bond durability under both wet and dry bonding conditions. Furthermore, selective extrafibrillar demineralization dentin conditioners demonstrated remarkable effectiveness in improving resin-dentin bond durability under dry bonding conditions; however, more data are needed to support their use.
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Affiliation(s)
- Shuyao Zheng
- Postgraduate student, Department of Prosthodontics, Hospital of Stomatology, Jilin University, Changchun, Jilin, PR China
| | - Huan Chen
- Postgraduate student, Department of Prosthodontics, Hospital of Stomatology, Jilin University, Changchun, Jilin, PR China
| | - Qi Lin
- Postgraduate student, Department of Prosthodontics, Hospital of Stomatology, Jilin University, Changchun, Jilin, PR China
| | - Song Zhu
- Professor, Department of Prosthodontics, Hospital of Stomatology, Jilin University, Changchun, Jilin, PR China.
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Yao C, Liang S, Yu M, Wu H, Ahmed MH, Liu Y, Yu J, Zhao Y, Van der Bruggen B, Huang C, Van Meerbeek B. High-Performance Bioinspired Microspheres for Boosting Dental Adhesion. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2310251. [PMID: 38362704 DOI: 10.1002/smll.202310251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 01/13/2024] [Indexed: 02/17/2024]
Abstract
Dental adhesives are widely used in daily practice for minimally invasive restorative dentistry but suffer from bond degradation and biofilm attack. Bio-inspired by marine mussels having excellent surface-adhesion capability and high chemical affinity of polydopamine (PDA) to metal ions, herein, experimental zinc (Zn)-containing polydopamine-based adhesive formulation, further being referred to as "Zn-PDA@SiO2"-incorporated adhesive is proposed as a novel dental adhesive. Different Zn contents (5 and 10 mm) of Zn-PDA@SiO2 are prepared. Considering the synergistic effect of Zn and PDA, Zn-PDA@SiO2 not only presents excellent antibacterial potential and notably inhibits enzymatic activity (soluble and matrix-bound proteases), but also exhibits superior biocompatibility and biosafety in vitro/vivo. The long-term bond stability is substantially improved by adding 5 wt% 5 mm Zn-PDA@SiO2 to the primer. The aged bond strength of the experimentally formulated dental adhesives applied in self-etch (SE) bonding mode is 1.9 times higher than that of the SE gold-standard adhesive. Molecular dynamics calculations indicate the stable formation of covalent bonds, Zn-assisted coordinative bonds, and hydrogen bonds between PDA and collagen. Overall, this bioinspired dental adhesive provides an avenue technology for innovative biomedical applications and has already revealed promising perspectives for dental restorative dentistry.
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Affiliation(s)
- Chenmin Yao
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, Key Laboratory of Oral Biomedicine Ministry of Education, Hubei Key Laboratory of Stomatology, School & Hospital of Stomatology, Wuhan University, Wuhan, 430079, China
- Department of Oral Health Sciences, BIOMAT & UZ Leuven (University Hospitals Leuven), Dentistry, KU Leuven (University of Leuven), Leuven, 3000, Belgium
| | - Shengjie Liang
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, Key Laboratory of Oral Biomedicine Ministry of Education, Hubei Key Laboratory of Stomatology, School & Hospital of Stomatology, Wuhan University, Wuhan, 430079, China
| | - Miaoyang Yu
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, Key Laboratory of Oral Biomedicine Ministry of Education, Hubei Key Laboratory of Stomatology, School & Hospital of Stomatology, Wuhan University, Wuhan, 430079, China
| | - Hongling Wu
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, Key Laboratory of Oral Biomedicine Ministry of Education, Hubei Key Laboratory of Stomatology, School & Hospital of Stomatology, Wuhan University, Wuhan, 430079, China
| | - Mohammed H Ahmed
- Department of Oral Health Sciences, BIOMAT & UZ Leuven (University Hospitals Leuven), Dentistry, KU Leuven (University of Leuven), Leuven, 3000, Belgium
- Department of Dental Biomaterials, Faculty of Dentistry, Tanta University, Tanta, 31511, Egypt
| | - Yingheng Liu
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, Key Laboratory of Oral Biomedicine Ministry of Education, Hubei Key Laboratory of Stomatology, School & Hospital of Stomatology, Wuhan University, Wuhan, 430079, China
| | - Jian Yu
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, Key Laboratory of Oral Biomedicine Ministry of Education, Hubei Key Laboratory of Stomatology, School & Hospital of Stomatology, Wuhan University, Wuhan, 430079, China
| | - Yan Zhao
- Department of Chemical Engineering, KU Leuven (University of Leuven), Celestijnenlaan 200F, Leuven, B-3001, Belgium
| | - Bart Van der Bruggen
- Department of Chemical Engineering, KU Leuven (University of Leuven), Celestijnenlaan 200F, Leuven, B-3001, Belgium
| | - Cui Huang
- State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, Key Laboratory of Oral Biomedicine Ministry of Education, Hubei Key Laboratory of Stomatology, School & Hospital of Stomatology, Wuhan University, Wuhan, 430079, China
| | - Bart Van Meerbeek
- Department of Oral Health Sciences, BIOMAT & UZ Leuven (University Hospitals Leuven), Dentistry, KU Leuven (University of Leuven), Leuven, 3000, Belgium
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Chen Z, Wei Y, Liang L, Wang X, Peng F, Liang Y, Huang X, Yan K, Gao Y, Li K, Huang X, Jiang X, Chen W. Theaflavin -3,3'-digallate/ethanol: a novel cross-linker for stabilizing dentin collagen. Front Bioeng Biotechnol 2024; 12:1401032. [PMID: 38812911 PMCID: PMC11133682 DOI: 10.3389/fbioe.2024.1401032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2024] [Accepted: 04/16/2024] [Indexed: 05/31/2024] Open
Abstract
Objectives To study the ability of theaflavin-3,3'-digallate (TF3)/ethanol solution to crosslink demineralized dentin collagen, resist collagenase digestion, and explore the potential mechanism. Methods Fully demineralized dentin blocks were prepared using human third molars that were caries-free. Then, these blocks were randomly allocated into 14 separate groups (n = 6), namely, control, ethanol, 5% glutaraldehyde (GA), 12.5, 25, 50, and 100 mg/ml TF3/ethanol solution groups. Each group was further divided into two subgroups based on crosslinking time: 30 and 60 s. The efficacy and mechanism of TF3's interaction with dentin type I collagen were predicted through molecular docking. The cross-linking, anti-enzymatic degradation, and biomechanical properties were studied by weight loss, hydroxyproline release, scanning/transmission electron microscopy (SEM/TEM), in situ zymography, surface hardness, thermogravimetric analysis, and swelling ratio. Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy were utilized to explore its mechanisms. Statistical analysis was performed using one and two-way analysis of variance and Tukey's test. Results TF3/ethanol solution could effectively crosslink demineralized dentin collagen and improve its resistance to collagenase digestion and biomechanical properties (p < 0.05), showing concentration and time dependence. The effect of 25 and 50 mg/ml TF3/ethanol solution was similar to that of 5% GA, whereas the 100 mg/mL TF3/ethanol solution exhibited better performance (p < 0.05). TF3 and dentin type I collagen are mainly cross-linked by hydrogen bonds, and there may be covalent and hydrophobic interactions. Conclusion TF3 has the capability to efficiently cross-link demineralized dentin collagen, enhancing its resistance to collagenase enzymatic hydrolysis and biomechanical properties within clinically acceptable timeframes (30 s/60 s). Additionally, it exhibits promise in enhancing the longevity of dentin adhesion.
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Affiliation(s)
- Zhiyong Chen
- Guangxi Key Laboratory of Oral and Maxillofacial Rehabilitation and Reconstruction, Guangxi Clinical Research Center for Craniofacial Deformity, College & Hospital of Stomatology, Guangxi Medical University, Nanning, China
- Department of Prosthodontics, College & Hospital of Stomatology, Guangxi Medical University, Nanning, China
| | - Yingxian Wei
- Guangxi Key Laboratory of Oral and Maxillofacial Rehabilitation and Reconstruction, Guangxi Clinical Research Center for Craniofacial Deformity, College & Hospital of Stomatology, Guangxi Medical University, Nanning, China
| | - Likun Liang
- Guangxi Key Laboratory of Oral and Maxillofacial Rehabilitation and Reconstruction, Guangxi Clinical Research Center for Craniofacial Deformity, College & Hospital of Stomatology, Guangxi Medical University, Nanning, China
| | - Xu Wang
- Guangxi Key Laboratory of Oral and Maxillofacial Rehabilitation and Reconstruction, Guangxi Clinical Research Center for Craniofacial Deformity, College & Hospital of Stomatology, Guangxi Medical University, Nanning, China
| | - Fangfei Peng
- Guangxi Key Laboratory of Oral and Maxillofacial Rehabilitation and Reconstruction, Guangxi Clinical Research Center for Craniofacial Deformity, College & Hospital of Stomatology, Guangxi Medical University, Nanning, China
| | - Yiying Liang
- Guangxi Key Laboratory of Oral and Maxillofacial Rehabilitation and Reconstruction, Guangxi Clinical Research Center for Craniofacial Deformity, College & Hospital of Stomatology, Guangxi Medical University, Nanning, China
| | - Xin Huang
- Guangxi Key Laboratory of Oral and Maxillofacial Rehabilitation and Reconstruction, Guangxi Clinical Research Center for Craniofacial Deformity, College & Hospital of Stomatology, Guangxi Medical University, Nanning, China
| | - Kaiqi Yan
- Guangxi Key Laboratory of Oral and Maxillofacial Rehabilitation and Reconstruction, Guangxi Clinical Research Center for Craniofacial Deformity, College & Hospital of Stomatology, Guangxi Medical University, Nanning, China
| | - Yunxia Gao
- Guangxi Key Laboratory of Oral and Maxillofacial Rehabilitation and Reconstruction, Guangxi Clinical Research Center for Craniofacial Deformity, College & Hospital of Stomatology, Guangxi Medical University, Nanning, China
| | - Kangjing Li
- Guangxi Key Laboratory of Oral and Maxillofacial Rehabilitation and Reconstruction, Guangxi Clinical Research Center for Craniofacial Deformity, College & Hospital of Stomatology, Guangxi Medical University, Nanning, China
- Department of Endodontics, College & Hospital of Stomatology, Guangxi Medical University, Nanning, China
| | - Xiaoman Huang
- Guangxi Key Laboratory of Oral and Maxillofacial Rehabilitation and Reconstruction, Guangxi Clinical Research Center for Craniofacial Deformity, College & Hospital of Stomatology, Guangxi Medical University, Nanning, China
| | - Xinglu Jiang
- Guangxi Key Laboratory of Oral and Maxillofacial Rehabilitation and Reconstruction, Guangxi Clinical Research Center for Craniofacial Deformity, College & Hospital of Stomatology, Guangxi Medical University, Nanning, China
- Clinical Laboratory Medicine Department, College & Hospital of Stomatology, Guangxi Medical University, Nanning, China
| | - Wenxia Chen
- Guangxi Key Laboratory of Oral and Maxillofacial Rehabilitation and Reconstruction, Guangxi Clinical Research Center for Craniofacial Deformity, College & Hospital of Stomatology, Guangxi Medical University, Nanning, China
- Department of Endodontics, College & Hospital of Stomatology, Guangxi Medical University, Nanning, China
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Yu HP, Zhu YJ. Guidelines derived from biomineralized tissues for design and construction of high-performance biomimetic materials: from weak to strong. Chem Soc Rev 2024; 53:4490-4606. [PMID: 38502087 DOI: 10.1039/d2cs00513a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/20/2024]
Abstract
Living organisms in nature have undergone continuous evolution over billions of years, resulting in the formation of high-performance fracture-resistant biomineralized tissues such as bones and teeth to fulfill mechanical and biological functions, despite the fact that most inorganic biominerals that constitute biomineralized tissues are weak and brittle. During the long-period evolution process, nature has evolved a number of highly effective and smart strategies to design chemical compositions and structures of biomineralized tissues to enable superior properties and to adapt to surrounding environments. Most biomineralized tissues have hierarchically ordered structures consisting of very small building blocks on the nanometer scale (nanoparticles, nanofibers or nanoflakes) to reduce the inherent weaknesses and brittleness of corresponding inorganic biominerals, to prevent crack initiation and propagation, and to allow high defect tolerance. The bioinspired principles derived from biomineralized tissues are indispensable for designing and constructing high-performance biomimetic materials. In recent years, a large number of high-performance biomimetic materials have been prepared based on these bioinspired principles with a large volume of literature covering this topic. Therefore, a timely and comprehensive review on this hot topic is highly important and contributes to the future development of this rapidly evolving research field. This review article aims to be comprehensive, authoritative, and critical with wide general interest to the science community, summarizing recent advances in revealing the formation processes, composition, and structures of biomineralized tissues, providing in-depth insights into guidelines derived from biomineralized tissues for the design and construction of high-performance biomimetic materials, and discussing recent progress, current research trends, key problems, future main research directions and challenges, and future perspectives in this exciting and rapidly evolving research field.
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Affiliation(s)
- Han-Ping Yu
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China.
| | - Ying-Jie Zhu
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China.
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
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Sahadi BO, Sebold M, André CB, Nima G, Dos Santos A, Chiari MDESDC, Nascimento FD, Tersariol ILDS, Giannini M. Effect of experimental dentin etchants on dentin bond strength, metalloproteinase inhibition, and antibiofilm activity. Dent Mater 2024; 40:e12-e23. [PMID: 38368137 DOI: 10.1016/j.dental.2024.02.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Revised: 02/12/2024] [Accepted: 02/12/2024] [Indexed: 02/19/2024]
Abstract
OBJECTIVE this study evaluated dentin microtensile bond strength (µTBS) and failure modes (at 24 h and one year), bonding interface regarding hybridization, surface morphology regarding demineralization, in situ metalloproteinase (MMP) activity, and antibacterial effect of three dentin etchants compared to 35% phosphoric acid (PA). MATERIALS AND METHODS The Adper Single Bond 2 adhesive (3 M Oral Care) was applied on moist dentin etched with PA (control) or on air-dried dentin etched with 3% aluminum nitrate + 2% oxalic acid (AN), 6.8% ferric oxalate + 10% citric acid (FO), or 10% citric acid (CA). The µTBS test used 40 human teeth (n = 10). Failure modes and surface morphology were analyzed by scanning electron microscopy (n = 3), while bonding interface morphology and MMP activity were evaluated by laser scanning confocal microscopy (n = 3). Antibacterial activity was evaluated against S. Mutans biofilm by means of viable cells count (CFU/mL). RESULTS PA presented the highest bond strengths regardless of aging time. PA, AN, and CA showed stable bond strengths after one year of storage. Adhesive and mixed failures were predominant in all groups. Thin hybrid layers with short resin tags were observed for the experimental etchants. The AN-based etchant was able to inhibit MMP activity. All tested etchants presented antibacterial activity against S. Mutans biofilm. SIGNIFICANCE This study suggests different dentin etchants capable of inhibiting MMP activity while also acting as cavity disinfectants.
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Affiliation(s)
- Beatriz Ometto Sahadi
- Department of Restorative Dentistry, Operative Dentistry Division, University of Campinas, Piracicaba Dental School, Avenida Limeira 901, Areião, 13414-903 Piracicaba, SP, Brazil.
| | - Maicon Sebold
- Department of Restorative Dentistry, Operative Dentistry Division, University of Campinas, Piracicaba Dental School, Avenida Limeira 901, Areião, 13414-903 Piracicaba, SP, Brazil.
| | - Carolina Bosso André
- Department of Restorative Dentistry, Operative Dentistry Division, Federal University of Minas Gerais, School of Dentistry, Avenida Presidente Antonio Carlos 6627, Pampulha, 31270-901 Belo Horizonte, MG, Brazil.
| | - Gabriel Nima
- Department of Biomedical Sciences, Ethics, Research and Education, Universidad de los Andes, School of Dentistry, Monseñor Álvaro del Portillo 12455, Las Condes 12455, Santiago, Chile.
| | - Andressa Dos Santos
- Applied Chemistry Graduate Program, Midwest State University UNICENTRO, Alameda Élio Antônio Dalla Vechhia 838, Vila Carli, 85040-167 Guarapuava, PR, Brazil.
| | | | - Fábio Dupart Nascimento
- Department of Molecular Biology, Federal University of São Paulo, São Paulo 04021-001, SP, Brazil.
| | | | - Marcelo Giannini
- Department of Restorative Dentistry, Operative Dentistry Division, University of Campinas, Piracicaba Dental School, Avenida Limeira 901, Areião, 13414-903 Piracicaba, SP, Brazil.
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Wu YT, Lu PW, Lin CA, Chang LY, Jaihao C, Peng TY, Lee WF, Teng NC, Lee SY, Dwivedi RP, Negi P, Yang JC. Development of a zinc chloride-based chemo-mechanical system for potential minimally invasive dental caries removal system. J Dent Sci 2024; 19:919-928. [PMID: 38618085 PMCID: PMC11010630 DOI: 10.1016/j.jds.2023.08.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Revised: 08/01/2023] [Indexed: 04/16/2024] Open
Abstract
Background/purpose The chemo-mechanical caries-removal technique is known to offer advantages of selective dentin caries treatment while leaving healthy dental tissues intact. However, current sodium hypochlorite based reagents usually excessively damage dentin collagen. Therefore, the purpose of this study was to develop a novel chemo-mechanical caries-removal system to preserve the collagen network for subsequent prosthetic restorations. Materials and methods The calfskin-derived collagen was chosen as a model system to investigate the dissolution behavior of collagen under different operating conditions of chemical-ultrasonic treatment systems. The molecular weight, triple-helix structure, the morphology, and functional group of collagen after treatment were investigated. Results Various concentrations of sodium hypochlorite or zinc chloride together with ultrasonic machinery were chosen to investigate. The outcomes of circular dichroism (CD) spectra demonstrated stability of the triple-helix structure after treatment of a zinc chloride solution. In addition, two apparent bands at molecular weights (MWs) of 130 and 121 kDa evidenced the stability of collagen network. The positive 222 nm and 195 nm negative CD absorption band indicated the existence of a triple-helix structure for type I collagen. The preservation of the morphology and functional group of the collagen network on the etched dentin surface were investigated by in vitro dentin decalcification model. Conclusion Unlike NaOCl, the 5 wt% zinc chloride solution combined with ultra-sonication showed dissolution rather than denature as well as degradation of the dentin collagen network. Additional in vivo evaluations are needed to verify its usefulness in clinical applications.
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Affiliation(s)
- Yu-Tzu Wu
- Graduate Institute of Nanomedicine and Medical Engineering, Taipei Medical University, Taipei, Taiwan
| | - Po-Wen Lu
- Graduate Institute of Biomedical Materials and Tissue Engineering, Taipei Medical University, Taipei, Taiwan
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Shuang Ho Hospital, New Taipei, Taiwan
| | - Chih-An Lin
- Graduate Institute of Nanomedicine and Medical Engineering, Taipei Medical University, Taipei, Taiwan
| | - Liang-Yu Chang
- Graduate Institute of Nanomedicine and Medical Engineering, Taipei Medical University, Taipei, Taiwan
| | - Chonlachat Jaihao
- Graduate Institute of Biomedical Materials and Tissue Engineering, Taipei Medical University, Taipei, Taiwan
| | - Tzu-Yu Peng
- School of Dentistry, Taipei Medical University, Taipei, Taiwan
| | - Wei-Fang Lee
- School of Dental Technology, Taipei Medical University, Taipei, Taiwan
| | - Nai-Chia Teng
- School of Dentistry, Taipei Medical University, Taipei, Taiwan
| | - Sheng-Yang Lee
- School of Dentistry, Taipei Medical University, Taipei, Taiwan
| | - Ram Prakash Dwivedi
- School of Electrical and Computer Science Engineering, Shoolini University, Himachal Pradesh, India
| | - Poonam Negi
- School of Pharmaceutical Sciences, Biotechnology and Management Sciences, Shoolini University, Himachal Pradesh, India
| | - Jen-Chang Yang
- Graduate Institute of Nanomedicine and Medical Engineering, Taipei Medical University, Taipei, Taiwan
- International Ph.D. Program in Biomedical Engineering, Taipei Medical University, Taipei, Taiwan
- Research Center of Biomedical Device, Taipei Medical University, Taipei, Taiwan
- Research Center of Digital Oral Science and Technology, Taipei Medical University, Taipei, Taiwan
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Xiao P, Roy A, Wang X. In-silico simulation of nanoindentation on bone using a 2D cohesive finite element model. J Mech Behav Biomed Mater 2024; 151:106403. [PMID: 38237206 DOI: 10.1016/j.jmbbm.2024.106403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Revised: 01/10/2024] [Accepted: 01/11/2024] [Indexed: 02/03/2024]
Abstract
This study proposed and validated a 2D finite element (FE) model for conducting in-silico simulations of in-situ nanoindentation tests on mineralized collagen fibrils (MCF) and the extrafibrillar matrix (EFM) within human cortical bone. Initially, a multiscale cohesive FE model was developed by adapting a previous model of bone lamellae, encompassing both MCF and EFM. Subsequently, nanoindentation tests were simulated in-silico using this model, and the resulting predictions were compared to AFM nanoindentation test data to verify the model's accuracy. The FE model accurately predicted nanoindentation results under wet conditions, closely aligning with outcomes obtained from AFM nanoindentation tests. Specifically, it successfully mirrored the traction/separation curve, nanoindentation modulus, plastic energy dissipation, and plastic energy ratio obtained from AFM nanoindentation tests. Additionally, this in-silico model demonstrated its ability to capture alterations in nanoindentation properties caused by the removal of bound water, by considering corresponding changes in mechanical properties of the collagen phase and the interfaces among bone constituents. Notably, significant changes in the elastic modulus and plastic energy dissipation were observed in both MCF and EFM compartments of bone, consistent with observations in AFM nanoindentation tests. These findings indicate that the proposed in-silico model effectively captures the influence of ultrastructural changes on bone's mechanical properties at sub-lamellar levels. Presently, no experimental methods exist to conduct parametric studies elucidating the ultrastructural origins of bone tissue fragility. The introduction of this in-silico model presents an invaluable tool to bridge this knowledge gap in the future.
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Affiliation(s)
- Pengwei Xiao
- Department of Mechanical Engineering, University of Texas at San Antonio, USA
| | - Anuradha Roy
- Department of Management Science and Statistics, University of Texas at San Antonio, USA
| | - Xiaodu Wang
- Department of Mechanical Engineering, University of Texas at San Antonio, USA.
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Wang Y, Mao J, Wang Y, Jiang N, Shi X. Multifunctional Exosomes Derived from M2 Macrophages with Enhanced Odontogenesis, Neurogenesis and Angiogenesis for Regenerative Endodontic Therapy: An In Vitro and In Vivo Investigation. Biomedicines 2024; 12:441. [PMID: 38398043 PMCID: PMC10886856 DOI: 10.3390/biomedicines12020441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Revised: 02/02/2024] [Accepted: 02/09/2024] [Indexed: 02/25/2024] Open
Abstract
INTRODUCTION Exosomes derived from M2 macrophages (M2-Exos) exhibit tremendous potential for inducing tissue repair and regeneration. Herein, this study was designed to elucidate the biological roles of M2-Exos in regenerative endodontic therapy (RET) compared with exosomes from M1 macrophages (M1-Exos). METHODS The internalization of M1-Exos and M2-Exos by dental pulp stem cells (DPSCs) and human umbilical vein endothelial cells (HUVECs) was detected by uptake assay. The effects of M1-Exos and M2-Exos on DPSC and HUVEC behaviors, including migration, proliferation, odonto/osteogenesis, neurogenesis, and angiogenesis were determined in vitro. Then, Matrigel plugs incorporating M2-Exos were transplanted subcutaneously into nude mice. Immunostaining for vascular endothelial growth factor (VEGF) and CD31 was performed to validate capillary-like networks. RESULTS M1-Exos and M2-Exos were effectively absorbed by DPSCs and HUVECs. Compared with M1-Exos, M2-Exos considerably facilitated the proliferation and migration of DPSCs and HUVECs. Furthermore, M2-Exos robustly promoted ALP activity, mineral nodule deposition, and the odonto/osteogenic marker expression of DPSCs, indicating the powerful odonto/osteogenic potential of M2-Exos. In sharp contrast with M1-Exos, which inhibited the neurogenic capacity of DPSCs, M2-Exos contributed to a significantly augmented expression of neurogenic genes and the stronger immunostaining of Nestin. Consistent with remarkably enhanced angiogenic markers and tubular structure formation in DPSCs and HUVECs in vitro, the employment of M2-Exos gave rise to more abundant vascular networks, dramatically higher VEGF expression, and widely spread CD31+ tubular lumens in vivo, supporting the enormous pro-angiogenic capability of M2-Exos. CONCLUSIONS The multifaceted roles of M2-Exos in ameliorating DPSC and HUVEC functions potentially contribute to complete functional pulp-dentin complex regeneration.
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Affiliation(s)
- Yujie Wang
- Center of Stomatology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China; (Y.W.); (J.M.); (Y.W.)
- School of Stomatology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
- Hubei Province Key Laboratory of Oral and Maxillofacial Development and Regeneration, Wuhan 430022, China
| | - Jing Mao
- Center of Stomatology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China; (Y.W.); (J.M.); (Y.W.)
- School of Stomatology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
- Hubei Province Key Laboratory of Oral and Maxillofacial Development and Regeneration, Wuhan 430022, China
| | - Yifan Wang
- Center of Stomatology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China; (Y.W.); (J.M.); (Y.W.)
- School of Stomatology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
- Hubei Province Key Laboratory of Oral and Maxillofacial Development and Regeneration, Wuhan 430022, China
| | - Nan Jiang
- Central Laboratory, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Peking University School and Hospital of Stomatology, Beijing 100081, China;
| | - Xin Shi
- Center of Stomatology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China; (Y.W.); (J.M.); (Y.W.)
- School of Stomatology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
- Hubei Province Key Laboratory of Oral and Maxillofacial Development and Regeneration, Wuhan 430022, China
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Li M, Qiu Y, Wang Y, Zhang S, Duan L, Zhao W, Shi Y, Zhang Z, Tay FR, Fu B. A glycol chitosan derivative with extrafibrillar demineralization potential for self-etch dentin bonding. Dent Mater 2024; 40:327-339. [PMID: 38065798 DOI: 10.1016/j.dental.2023.11.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Revised: 11/22/2023] [Accepted: 11/23/2023] [Indexed: 02/12/2024]
Abstract
OBJECTIVES Extrafibrillar demineralization is an etching technique that removes only minerals from around the collagen fibrils for resin infiltration. The intrafibrillar minerals are left intact to avoid their replacement by water that is hard for adhesive resin monomers to displace. The present work reported the synthesis of a water-soluble methacryloyloxy glycol chitosan-EDTA conjugate (GCE-MA) and evaluated its potential as an extrafibrillar demineralization agent for self-etch dentin bonding. METHODS Glycol chitosan-EDTA was functionalized with a methacryloyloxy functionality. Conjugation was confirmed using Fourier transform-infrared spectroscopy. The GCE-MA was used to prepare experimental self-etch primers. Extrafibrillar demineralization of the primers was evaluated with scaning electron microscopy and transmission electron microscopy. The feasibility of this new self-etch bonding approach was evaluated using microtensile bond strength testing and inhibition of dentin gelatinolytic activity. The antibacterial activity and cytotoxicity of GCE-MA were also analyzed. RESULTS Conjugation of EDTA and the methacryloyloxy functionality to glycol chitosan was successful. The functionalized conjugate was capable of extrafibrillar demineralization of mineralized collagen fibrils. Tensile bond strength of the experimental self-etch primer to dentin was comparable to that of phosphoric acid-etched dentin and the commercial self-etch primer Clearfil SE Bond 2. The GCE-MA also inhibited soluble rhMMP-9. In-situ zymography detected minimal fluorescence in hybrid layers conditioned with the experimental primer. The GCE-MA was noncytotoxic and possessed antibacterial activities against planktonic bacteria. SIGNIFICANCE Synthesis of GCE-MA brought into fruition a self-etch conditioner that selectively demineralizes the extrafibrillar mineral component of dentin. A self-etch primer prepared with GCE-MA achieved bond strengths comparable to commercial reference adhesive systems.
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Affiliation(s)
- Mingxing Li
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Clinical Research Center for Oral Diseases of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou, China
| | - Yuan Qiu
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Clinical Research Center for Oral Diseases of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou, China
| | - Yinlin Wang
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Clinical Research Center for Oral Diseases of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou, China
| | - Sisi Zhang
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Clinical Research Center for Oral Diseases of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou, China
| | - Lian Duan
- College of Sericulture, Textile and Biomass Sciences, Southwest University, Chongqing, China
| | - Weijia Zhao
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Clinical Research Center for Oral Diseases of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou, China
| | - Ying Shi
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Clinical Research Center for Oral Diseases of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou, China
| | - Zhengyi Zhang
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Clinical Research Center for Oral Diseases of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou, China
| | - Franklin R Tay
- The Dental College of Georgia, Augusta University, Augusta, GA, USA.
| | - Baiping Fu
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Clinical Research Center for Oral Diseases of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou, China.
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11
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Reis-Havlat M, Alania Y, Zhou B, Jing SX, McAlpine JB, Chen SN, Pauli GF, Bedran-Russo AK. Modulatory role of terminal monomeric flavan-3-ol units in the viscoelasticity of dentin. J Biomed Mater Res B Appl Biomater 2024; 112:e35333. [PMID: 37792302 PMCID: PMC10842555 DOI: 10.1002/jbm.b.35333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 07/27/2023] [Accepted: 09/07/2023] [Indexed: 10/05/2023]
Abstract
Flavan-3-ol monomers are the building blocks of proanthocyanidins (PACs), natural compounds from plants shown to mediate specific biologic activities on dentin. While the stereochemistry of the terminal flavan-3-ols, catechin (C) versus epicatechin (EC), impacts the biomechanical properties of the dentin matrix treated with oligomeric PACs, structure-activity relationships driving this bioactivity remain elusive. To gain insights into the modulatory role of the terminal monomers, two highly congruent trimeric PACs from Pinus massoniana only differing in the stereochemistry of the terminal unit (Trimer-C vs. Trimer-EC) were prepared to evaluate their chemical characteristics as well as their effects on the viscoelasticity and biostability of biomodified dentin matrices via infrared spectroscopy and multi-scale dynamic mechanical analyses. The subtle alteration of C versus EC as terminal monomers lead to distinct immediate PAC-trimer biomodulation of the dentin matrix. Nano- and micro-dynamic mechanical analyses revealed that Trimer-EC increased the complex moduli (0.51 GPa) of dentin matrix more strongly than Trimer-C (0.26 GPa) at the nanoscale length (p < 0.001), whereas the reverse was found at the microscale length (p < .001). The damping capacity (tan δ) of dentin matrix decreased by 70% after PAC treatment at the nano-length scale, while increased values were found at the micro-length scale (~0.24) compared to the control (0.18 ; p < .001). An increase in amide band intensities and a decrease of complex moduli was observed after storage in simulated body fluid for both Trimer-C and Trimer-EC modified dentin. The stereochemical configuration of the terminal monomeric units, C and EC, did not impact the chemo-mechanical stability of dentin matrix.
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Affiliation(s)
- Mariana Reis-Havlat
- Department of General Dental Sciences, School of Dentistry, Marquette University, Milwaukee, WI, 53233, United States’
| | - Yvette Alania
- Department of General Dental Sciences, School of Dentistry, Marquette University, Milwaukee, WI, 53233, United States’
| | - Bin Zhou
- Pharmacognosy Institute and Department of Pharmaceutical Sciences (PSCI), College of Pharmacy, University of Illinois at Chicago, Chicago, IL, 60612, United States
| | - Shu-Xi Jing
- Pharmacognosy Institute and Department of Pharmaceutical Sciences (PSCI), College of Pharmacy, University of Illinois at Chicago, Chicago, IL, 60612, United States
| | - James B. McAlpine
- Pharmacognosy Institute and Department of Pharmaceutical Sciences (PSCI), College of Pharmacy, University of Illinois at Chicago, Chicago, IL, 60612, United States
| | - Shao-Nong Chen
- Pharmacognosy Institute and Department of Pharmaceutical Sciences (PSCI), College of Pharmacy, University of Illinois at Chicago, Chicago, IL, 60612, United States
| | - Guido F. Pauli
- Pharmacognosy Institute and Department of Pharmaceutical Sciences (PSCI), College of Pharmacy, University of Illinois at Chicago, Chicago, IL, 60612, United States
| | - Ana K. Bedran-Russo
- Department of General Dental Sciences, School of Dentistry, Marquette University, Milwaukee, WI, 53233, United States’
- Department of Oral Biology, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois 60612, United States
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12
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Cai J, Moradian-Oldak J. Triple Function of Amelogenin Peptide-Chitosan Hydrogel for Dentin Repair. J Dent Res 2023; 102:1434-1443. [PMID: 37880947 PMCID: PMC10767697 DOI: 10.1177/00220345231198228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2023] Open
Abstract
Biomimetic strategies like peptide-guided collagen mineralization promise to enhance the effectiveness of dentin remineralization. We recently reported that rationally designed amelogenin-derived peptides P26 and P32 promoted apatite nucleation, mineralized collagen, and showed potential in enamel regrowth and dentin remineralization. To facilitate the clinical application of amelogenin-derived peptides and to uncover their effectiveness in repairing dentin, we have now implemented a chitosan (CS) hydrogel for peptide delivery and have investigated the effects of P26-CS and P32-CS hydrogels on dentin remineralization using 2 in situ experimental models that exhibited different levels of demineralization. The efficacy of the peptide-CS hydrogels in dentin repair was evaluated by characterizing the microstructure, mineral density, mineral phase, and nanomechanical properties of the remineralized samples. The new strategy of atomic force microscopy PeakForce quantitative nanomechanical mapping was used for direct visualization and nanomechanical analysis of repaired dentin lesions across the lesion depth. Results from the 2 models indicated the potential triple functions of peptide-CS hydrogels for dentin repair: building a highly organized protective mineralized layer on dentin, occluding dentinal tubules by peptide-guided in situ mineralization, and promoting biomimetic dentinal collagen remineralization. Importantly, peptides released from the CS hydrogel could diffuse into the dentinal matrix and penetrate the dentinal tubules, leading to both surface and subsurface remineralization and tubule occlusion. Given our previous findings on peptide-CS hydrogels' potential for remineralizing enamel, we see further promise for hydrogels to treat tooth defects involving multiple hard tissues, as in the case of noncarious cervical lesions.
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Affiliation(s)
- J. Cai
- Center for Craniofacial Molecular Biology, Herman Ostrow School of Dentistry, University of Southern California, Los Angeles, CA, USA
| | - J. Moradian-Oldak
- Center for Craniofacial Molecular Biology, Herman Ostrow School of Dentistry, University of Southern California, Los Angeles, CA, USA
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13
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Tang W, Li Q, Sui Y, Dong X, Nie R, Meng X. The cross-linking and protective effect of artemisinin and its derivatives on collagen fibers of demineralized dentin surface. J Dent 2023; 138:104733. [PMID: 37783373 DOI: 10.1016/j.jdent.2023.104733] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Revised: 09/28/2023] [Accepted: 09/29/2023] [Indexed: 10/04/2023] Open
Abstract
OBJECTIVE To investigate the cross-linking and protective effect of artemisinin (ART), dihydroartemisinin (DHA), and artesunate (AST) on collagen fibers of demineralized dentin surface. METHODS Molecular docking was used to predict potential interactions of ART, DHA, and AST with dentin type I collagen. Human third molars without caries were completely demineralized and treated with different solutions for 1 min. The molecular interactions and cross-linking degree of ART and its derivatives with dentin collagen were evaluated by FTIR spectroscopy, total extractable protein content, and a ninhydrin assay. Scanning electron microscopy, hydroxyproline release, and ultimate microtensile strength tests (μUTS) were employed to confirm the mechanical properties and anti-collagenase degradation properties of dentin collagen fibers. RESULTS ART, DHA, and AST combined with dentin type I collagen mainly through hydrogen bonding and hydrophobic interactions, and the cross-linking reaction sites were mainly C=O and CN functional groups. Compared to the control group, ART and its derivatives significantly increased the degree of cross-linking. Additionally, significant increases were observed in resistance to enzymatic digestion and mechanical properties of the artemisinin and its derivatives group. CONCLUSION ART, DHA, and AST could cross-link with demineralized dentin collagen, through improving the mechanical properties and anti-collagenase degradation properties. CLINICAL SIGNIFICANCE The study endorses the potential use of ART and its derivatives as a prospective collagen cross-linking agent for degradation-resistant and long-period dentin bonding in composite resin restorations.
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Affiliation(s)
- Wenya Tang
- Department of Prosthodontics, Nanjing Stomatological Hospital, Medical School of Nanjing University, #30 Zhongyang Road, Nanjing, Jiangsu 210008, PR China
| | - Qiongfang Li
- Department of Prosthodontics, Nanjing Stomatological Hospital, Medical School of Nanjing University, #30 Zhongyang Road, Nanjing, Jiangsu 210008, PR China
| | - Yuan Sui
- Department of Prosthodontics, Nanjing Stomatological Hospital, Medical School of Nanjing University, #30 Zhongyang Road, Nanjing, Jiangsu 210008, PR China
| | - Xiaofei Dong
- Department of Prosthodontics, Nanjing Stomatological Hospital, Medical School of Nanjing University, #30 Zhongyang Road, Nanjing, Jiangsu 210008, PR China
| | - Rongrong Nie
- Department of Prosthodontics, Nanjing Stomatological Hospital, Medical School of Nanjing University, #30 Zhongyang Road, Nanjing, Jiangsu 210008, PR China
| | - Xiangfeng Meng
- Department of Prosthodontic Technology, Nanjing Stomatological Hospital, Medical School of Nanjing University, #30 Zhongyang Road, Nanjing, Jiangsu 210008, PR China.
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14
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Gong SQ, Tang L, Liu Z, Wang XY, Mao J, Li S, Liu Y. NDGA enhances the physicochemical and anti-biodegradation performance of dentin collagen. Oral Dis 2023; 29:3525-3539. [PMID: 36437605 DOI: 10.1111/odi.14453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Revised: 10/31/2022] [Accepted: 11/24/2022] [Indexed: 12/07/2023]
Abstract
OBJECTIVES Collagen fibrils from carious dentin matrix are prone to enzymatic degradation. This study investigates the feasibility and mechanism of nordihydroguaiaretic acid (NDGA), as a collagen crosslinker, to bio-modify the demineralized dentin matrix. METHODS The physicochemical properties of the crosslinked dentin matrix were characterized by swelling ratio, ninhydrin assay, Fourier Transform Infrared spectroscopy, and atomic force microscopy. The collagenase degradation resistance was evaluated by measuring loss of dry mass, hydroproline release, loss of elasticity, and micro-nano structure integrity. The cytotoxicity of NDGA-crosslinked dentin collagen was evaluated by flow cytometry. RESULTS NDGA crosslinked dentin matrix without destroying the integrity of collagen. Mechanistically, NDGA formed bisquinone bond between two adjacent o-quinone groups, resulting in NDGA polymeric matrix in which collagen fibrils were embedded. NDGA modification could significantly enhance the stiffness of dentin matrix at macro-nano scale. The NDGA-crosslinked dentin matrix exhibited remarkably low collagen degradation and sustained bulk elasticity after collagenase challenge, which were attributed to decreased water content, physical masking of collagenase bind sites on collagen, and improved stiffness of collagen fibrils. Notably, NDGA-crosslinked dentin matrix exhibited excellent biocompatibility. CONCLUSION NDGA, as a biocompatible collagen crosslinker, improves the mechanical properties and biodegradation resistance of demineralized dentin matrix.
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Affiliation(s)
- Shi-Qiang Gong
- Center of Stomatology, Tongji Hospital, Tongji Medical College, Hubei Province Key Laboratory of Oral and Maxillofacial Development and Regeneration & Huazhong University of Science and Technology, Wuhan, China
| | - Lin Tang
- Department of Prothodontics, Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology & Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health & NMPA Key Laboratory for Dental Materials, Beijing, China
| | - Zhuo Liu
- Center of Stomatology, Tongji Hospital, Tongji Medical College, Hubei Province Key Laboratory of Oral and Maxillofacial Development and Regeneration & Huazhong University of Science and Technology, Wuhan, China
| | - Xiang-Yao Wang
- Center of Stomatology, Tongji Hospital, Tongji Medical College, Hubei Province Key Laboratory of Oral and Maxillofacial Development and Regeneration & Huazhong University of Science and Technology, Wuhan, China
| | - Jing Mao
- Center of Stomatology, Tongji Hospital, Tongji Medical College, Hubei Province Key Laboratory of Oral and Maxillofacial Development and Regeneration & Huazhong University of Science and Technology, Wuhan, China
| | - Shuai Li
- Department of Oral Implantology, Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology & Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health & NMPA Key Laboratory for Dental Materials, Beijing, China
| | - Yan Liu
- Laboratory of Biomimetic Nanomaterials, Department of Orthodontics, Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology & Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health & NMPA Key Laboratory for Dental Materials, Beijing, China
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15
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Chen M, Ren M, Shi Y, Liu X, Wei H. State-of-the-art polyetheretherketone three-dimensional printing and multifunctional modification for dental implants. Front Bioeng Biotechnol 2023; 11:1271629. [PMID: 37929192 PMCID: PMC10621213 DOI: 10.3389/fbioe.2023.1271629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Accepted: 10/05/2023] [Indexed: 11/07/2023] Open
Abstract
Polyetheretherketone (PEEK) is a high-performance thermoplastic polymer with an elastic modulus close to that of the jawbone. PEEK has the potential to become a new dental implant material for special patients due to its radiolucency, chemical stability, color similarity to teeth, and low allergy rate. However, the aromatic main chain and lack of surface charge and chemical functional groups make PEEK hydrophobic and biologically inert, which hinders subsequent protein adsorption and osteoblast adhesion and differentiation. This will be detrimental to the deposition and mineralization of apatite on the surface of PEEK and limit its clinical application. Researchers have explored different modification methods to effectively improve the biomechanical, antibacterial, immunomodulatory, angiogenic, antioxidative, osteogenic and anti-osteoclastogenic, and soft tissue adhesion properties. This review comprehensively summarizes the latest research progress in material property advantages, three-dimensional printing synthesis, and functional modification of PEEK in the fields of implant dentistry and provides solutions for existing difficulties. We confirm the broad prospects of PEEK as a dental implant material to promote the clinical conversion of PEEK-based dental implants.
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Affiliation(s)
- Meiqing Chen
- Department of Stomatology, China-Japan Union Hospital of Jilin University, Changchun, China
| | - Mei Ren
- Department of Stomatology, China-Japan Union Hospital of Jilin University, Changchun, China
| | - Yingqi Shi
- Department of Stomatology, China-Japan Union Hospital of Jilin University, Changchun, China
| | - Xiuyu Liu
- Hospital of Stomatogy, Jilin University, Changchun, China
| | - Hongtao Wei
- Department of Stomatology, China-Japan Union Hospital of Jilin University, Changchun, China
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Yu J, Li Y, Liu X, Huang H, Wang Y, Zhang Q, Li Q, Cao CY. EDTA-functionalized silica nanoparticles as a conditioning agent for dentin bonding using etch-and-rinse technique. J Dent 2023; 134:104528. [PMID: 37105434 DOI: 10.1016/j.jdent.2023.104528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Revised: 04/22/2023] [Accepted: 04/24/2023] [Indexed: 04/29/2023] Open
Abstract
OBJECTIVE This study investigated the possibility of using ethylenediaminetetraacetic acid functionalized silica nanoparticles (EDTA-SiO2) as a dentin-conditioning agent using etch-and-rinse technique to promote the durability of dentin bonding. METHODS The SiO2-EDTA were synthesized by N- [(3- trimethoxysilyl) propyl] ethylenediamine triacetic acid (EDTA-TMS) and SiO2 (50 nm), then characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). The capacity of SiO2-EDTA to chelate calcium ions from dentin was examined by inductively coupled plasma-optic emission spectrometry (ICP-OES). The dentin surfaces conditioned with SiO2-EDTA were detected by field emission scanning electron microscopy (SEM), TEM and microhardness testing. For dentin bonding, dentin surfaces were adopted wet- or dry-bonding technique and bonded with adhesive (AdperTM Single Bond2) and applied composite resin (Filtek Z350) on them. The durability of dentin bonding was evaluated by mircotensile bond strength test, in-situ zymography and nanoleakage testing. RESULTS FTIR, TGA and XPS results showed that SiO2-EDTA contained N element and carboxyl groups. SEM, TEM and microhardness results indicated that SiO2-EDTA group created extrafibrillar demineralization and retained more intrafibrillar minerals within dentin surface. In the dentin bonding experiment, SiO2-EDTA group achieved acceptable bond strength, and reduced the activity of matrix metalloproteinase and nanoleakage along bonding interface. CONCLUSION It was possible to generate a feasible dentin conditioning agent (SiO2-EDTA), which could create dentin extrafibrillar demineralization and improve dentin bond durability. CLINICAL SIGNIFICANCE This study introduces a new dentin conditioning scheme based on SiO2-EDTA to create extrafibrillar demineralization for dentin bonding. This strategy has the potential to be used in clinic to promote the life of restoration bonding.
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Affiliation(s)
- Jianan Yu
- Stomatologic Hospital & College, Anhui Medical University, Key Lab. of Oral Diseases Research of Anhui Province, Hefei, 230032, China
| | - Yuexiang Li
- Stomatologic Hospital & College, Anhui Medical University, Key Lab. of Oral Diseases Research of Anhui Province, Hefei, 230032, China
| | - Xinyuan Liu
- Stomatologic Hospital & College, Anhui Medical University, Key Lab. of Oral Diseases Research of Anhui Province, Hefei, 230032, China
| | - Haowen Huang
- Stomatologic Hospital & College, Anhui Medical University, Key Lab. of Oral Diseases Research of Anhui Province, Hefei, 230032, China
| | - Yu Wang
- Stomatologic Hospital & College, Anhui Medical University, Key Lab. of Oral Diseases Research of Anhui Province, Hefei, 230032, China
| | - Qunlin Zhang
- Stomatologic Hospital & College, Anhui Medical University, Key Lab. of Oral Diseases Research of Anhui Province, Hefei, 230032, China; School of Pharmacy, Anhui Medical University, Hefei, 230032, China.
| | - Quanli Li
- Stomatologic Hospital & College, Anhui Medical University, Key Lab. of Oral Diseases Research of Anhui Province, Hefei, 230032, China
| | - Chris Ying Cao
- Stomatologic Hospital & College, Anhui Medical University, Key Lab. of Oral Diseases Research of Anhui Province, Hefei, 230032, China.
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Daood U, Fawzy A. Development of a bioactive dentin adhesive resin modified with magnesium-doped synthetic hydroxyapatite crystals. J Mech Behav Biomed Mater 2023; 140:105737. [PMID: 36827934 DOI: 10.1016/j.jmbbm.2023.105737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Revised: 02/14/2023] [Accepted: 02/16/2023] [Indexed: 02/19/2023]
Abstract
The aim is to evaluate the development of an experimental multi-mode/Universal resin-based dentin adhesive modified with synthetic Mg2+ doped hydroxyapatite crystals (HAp) having self-remineralization and antibiofilm properties. HAp doped with Mg2+ was prepared by the precipitation method. Experimental adhesives were subjected to degree of conversion and X-ray diffraction test for size and crystal structure. Bond strength was tested, and electron microscopy (SEM/TEM) imaging of resin-dentin interface was done along with nanoleakage, nanoindentation, confocal and Raman analyses. S. mutans was analysed using CLSM images against modified adhesive specimens. Nucleating abilities within the resin-dentin specimens are determined by measuring Ca2+. Alkaline phosphatase, Runx2, and Ocn transcripts are amplified using quantitative polymerase chain reaction (q-PCR). A calcium assay is performed to quantify level of mineralisation. When compared to control adhesives, the 0.5% Hap/Mg2+ containing experimental dentin adhesive demonstrated improved interaction with dentin. The preservation of uniform intact hybrid layer with the absence of nanoleakage indicated dentin bond integrity with 0.5% HAP/Mg2+ modified adhesive. Self-remineralization and antibiofilm potentials are supported.
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Affiliation(s)
- Umer Daood
- Restorative Division, School of Dentistry, International Medical University Kuala Lumpur, Bukit Jalil, 57000, Kuala Lumpur, Malaysia.
| | - Amr Fawzy
- UWA Dental School, University of Western Australia, Nedlands, WA, 6009, Australia
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18
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Zhao S, Zhang Y, Chen Y, Xing X, Wang Y, Wu G. Evaluation of Chitosan-Oleuropein Nanoparticles on the Durability of Dentin Bonding. Drug Des Devel Ther 2023; 17:167-180. [PMID: 36712950 PMCID: PMC9879028 DOI: 10.2147/dddt.s390039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Accepted: 01/14/2023] [Indexed: 01/23/2023] Open
Abstract
Purpose To evaluate the effects of dentin pretreatment with chitosan-loaded oleuropein nanoparticles (CONPs) on the durability of resin-dentin bonding interfaces. Methods Eighty freshly extracted non-carious human third molars were randomly divided into four groups (n = 20 each): a de-ionized water (DW) group, a chitosan (CS) group, a chlorhexidine (CHX) group and a CONP group. The dentin in the DW, CS, CHX, and CONP groups were pretreated with de-ionized water, 1.0 mg/L CS solution, 2% chlorhexidine solution, and CONP suspension (prepared with 100 mg/L oleuropein), respectively, followed by the universal adhesive and resin composites. The bonded teeth of each group were randomly divided into two subgroups: an immediate subgroup and an aged subgroup. The bonded teeth of each group were then cut into the bonded beams. We measured their microtensile bond strength (μTBS), observed the characteristics of bonding interface by atomic force microscope, calculated the percentage of silver particles in a selected area for interfacial nanoleakage analysis, and evaluated the endogenous gelatinase activity within the bonding interface for in-situ zymogram analysis. Data were analyzed with two-way ANOVA and LSD multiple comparison test (P < 0.05). Results Regardless of after 24 h or after thermocycling, CONP exhibited better μTBS (P < 0.05) than the other three groups except that there was not a statistical significance (P > 0.05) in the CONP and CHX groups after 24 h. Besides, the CONP group presented significantly higher modulus of elasticity in the hybrid layers (P < 0.05), lower expression of nanoleakage (P < 0.05), and better inhibitory effect of matrix metalloproteinases than the other three groups before and after thermocycling. Conclusion Altogether, the CONPs had the potential to act as a dentin primer, which could effectively improve the dentin-resin binding durability.
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Affiliation(s)
- Shuya Zhao
- Department of Pediatric Dentistry, Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, People’s Republic of China
| | - Yunyang Zhang
- Center of Modem Analysis, Nanjing University, Nanjing, People’s Republic of China
| | - Yun Chen
- Department of Pediatric Dentistry, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, People’s Republic of China
| | - Xianghui Xing
- Department of Pediatric Dentistry, Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, People’s Republic of China
| | - Yu Wang
- Department of Pediatric Dentistry, Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, People’s Republic of China
| | - Guofeng Wu
- Department of Prosthodontics, Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, People’s Republic of China,Correspondence: Guofeng Wu; Xianghui Xing, Email ;
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19
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Anada R, Hara ES, Nagaoka N, Okada M, Kamioka H, Matsumoto T. Important roles of odontoblast membrane phospholipids in early dentin mineralization. J Mater Chem B 2023; 11:657-666. [PMID: 36541228 DOI: 10.1039/d2tb02351b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The objective of this study was to first identify the timing and location of early mineralization of mouse first molar, and subsequently, to characterize the nucleation site for mineral formation in dentin from a materials science viewpoint and evaluate the effect of environmental cues (pH) affecting early dentin formation. Early dentin mineralization in mouse first molars began in the buccal central cusp on post-natal day 0 (P0), and was first hypothesized to involve collagen fibers. However, elemental mapping indicated the co-localization of phospholipids with collagen fibers in the early mineralization area. Co-localization of phosphatidylserine and annexin V, a functional protein that binds to plasma membrane phospholipids, indicated that phospholipids in the pre-dentin matrix were derived from the plasma membrane. A 3-dimensional in vitro biomimetic mineralization assay confirmed that phospholipids from the plasma membrane are critical factors initiating mineralization. Additionally, the direct measurement of the tooth germ pH, indicated it to be alkaline. The alkaline environment markedly enhanced the mineralization of cell membrane phospholipids. These results indicate that cell membrane phospholipids are nucleation sites for mineral formation, and could be important materials for bottom-up approaches aiming for rapid and more complex fabrication of dentin-like structures.
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Affiliation(s)
- Risa Anada
- Department of Biomaterials, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan. .,Department of Orthodontics, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan
| | - Emilio Satoshi Hara
- Department of Biomaterials, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan.
| | - Noriyuki Nagaoka
- Advanced Research Center for Oral and Craniofacial Sciences, Dental School, Okayama University, Okayama, Japan
| | - Masahiro Okada
- Department of Biomaterials, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan.
| | - Hiroshi Kamioka
- Department of Orthodontics, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan
| | - Takuya Matsumoto
- Department of Biomaterials, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan.
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20
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Lei Y, Xu J, Pan M, Chen Y, Li X, Zhu W, Shu C, Fang T, Liao H, Luo Q, Li X. Construction of an antibacterial low-defect hybrid layer by facile PEI electrostatic assembly promotes dentin bonding. J Mater Chem B 2023; 11:335-344. [PMID: 36412982 DOI: 10.1039/d2tb01683d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Dentin bonding is the most common form of human tissue repair among tissue-biomaterial adhesions, concerning billions of people's oral health worldwide. However, insufficient adhesive infiltration in the demineralized dentin matrix (DDM) always produces numerous defects in the bonding interface termed the hybrid layer, which causes high levels of bacteria-related secondary dental diseases, and less than 50% of the bonding lasts more than 5 years. Therefore, it is urgent and vital to construct an antibacterial low-defect hybrid layer to solve the durability-related problems. A DDM with a hydrogel-like surface formed by the hydration of highly-anionic non-collagenous proteins (NCPs) is firstly used as a template to electrostatically assemble polyethyleneimine (PEI). The formation of a stable antibacterial polyelectrolyte complex of PEI/NCPs rapidly eliminates NCP hydration capacity and significantly improves the infiltration of various adhesives. Simultaneously, both the PEI during the assembly and the PEI-assembled DDM can directly destroy a biofilm of S. Mutans on the DDM. Consequently, a long-term antibacterial and low-defect hybrid layer is successfully created, which greatly improves the bonding effectiveness. This helps to improve the clinical treatment of bacteria-based dental diseases and the tooth-restoration repair effect and prevent secondary dental diseases, having significance in clinical dentistry and providing insights for other tissue-biomaterial adhesions.
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Affiliation(s)
- Yuqing Lei
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Hangzhou 310000, P. R. China. .,Clinical Research Center for Oral Disease of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou 310000, China
| | - Jiajia Xu
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Hangzhou 310000, P. R. China. .,Clinical Research Center for Oral Disease of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou 310000, China
| | - Mengqi Pan
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Hangzhou 310000, P. R. China. .,Clinical Research Center for Oral Disease of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou 310000, China
| | - Yadong Chen
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Hangzhou 310000, P. R. China. .,Clinical Research Center for Oral Disease of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou 310000, China
| | - Xiaojun Li
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Hangzhou 310000, P. R. China. .,Clinical Research Center for Oral Disease of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou 310000, China
| | - Weipu Zhu
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Chang Shu
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Hangzhou 310000, P. R. China. .,Clinical Research Center for Oral Disease of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou 310000, China
| | - Tianxiang Fang
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Hongbing Liao
- Guangxi Key Laboratory of Oral and Maxillofacial Rehabilitation and Reconstruction, College of Stomatology, Guangxi Medical University, Guilin 530021, China
| | - Qiaojie Luo
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Hangzhou 310000, P. R. China. .,Clinical Research Center for Oral Disease of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou 310000, China
| | - Xiaodong Li
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Hangzhou 310000, P. R. China. .,Clinical Research Center for Oral Disease of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou 310000, China
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21
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Saad A, Penaloza Arias C, Wang M, ElKashty O, Brambilla D, Tamimi F, Cerruti M. Biomimetic Strategy to Enhance Epithelial Cell Viability and Spreading on PEEK Implants. ACS Biomater Sci Eng 2022; 8:5129-5144. [PMID: 36453830 DOI: 10.1021/acsbiomaterials.2c00764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
Polyetheretherketone (PEEK) is a biocompatible material widely used in spinal and craniofacial implants, with potential use in percutaneous implants. However, its inertness prevents it from forming a tight seal with the surrounding soft tissue, which can lead to infections and implant failure. Conversely, the surface chemistry of percutaneous organs (i.e., teeth) helps establish a strong interaction with the epithelial cells of the contacting soft tissues, and hence a tight seal, preventing infection. The seal is created by adsorption of basement membrane (BM) proteins, secreted by epithelial cells, onto the percutaneous organ surfaces. Here, we aim to create a tight seal between PEEK and epithelial tissues by mimicking the surface chemistry of teeth. Our hypothesis is that collagen I, the most abundant tooth protein, enables integration between the epithelial tissue and teeth by promoting adsorption of BM proteins. To test this, we immobilized collagen I via EDC/NHS coupling on a carboxylated PEEK surface modified using diazonium chemistry. We used titanium alloy (Ti-6Al-4V) for comparison, as titanium is the most widely used percutaneous biomaterial. Both collagen-modified PEEK and titanium showed a larger adsorption of key BM proteins (laminin, nidogen, and fibronectin) compared to controls. Keratinocyte epithelial cell viability on collagen-modified PEEK was twice that of control PEEK and ∼1.5 times that of control titanium after 3 days of cell seeding. Both keratinocytes and fibroblasts spread more on collagen-modified PEEK and titanium compared to controls. This work introduces a versatile and biomimetic surface modification technique that may enhance PEEK-epithelial tissue sealing with the potential of extending PEEK applications to percutaneous implants, making it competitive with titanium.
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Affiliation(s)
- Ahmed Saad
- Department of Mining and Materials Engineering, McGill University, MontrealH3A 0C5, Québec, Canada
| | | | - Min Wang
- Faculty of Dentistry, McGill University, MontrealH3A 0C5, Québec, Canada
| | - Osama ElKashty
- Faculty of Dentistry, McGill University, MontrealH3A 0C5, Québec, Canada.,Department of Oral Pathology, Faculty of Dentistry, Mansoura University, Mansoura35516, Egypt
| | - Davide Brambilla
- Faculty of Pharmacy, Université de Montréal, MontréalH3T 1J4, Québec, Canada
| | - Faleh Tamimi
- Faculty of Dentistry, McGill University, MontrealH3A 0C5, Québec, Canada.,College of Dental Medicine, Qatar University, University Street, Doha2713, Qatar
| | - Marta Cerruti
- Department of Mining and Materials Engineering, McGill University, MontrealH3A 0C5, Québec, Canada
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22
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Weerakoon AT, Condon N, Cox TR, Sexton C, Cooper C, Meyers IA, Thomson D, Ford PJ, Roy S, Symons AL. Dynamic dentin: A quantitative microscopic assessment of age and spatial changes to matrix architecture, peritubular dentin, and collagens types I and III. J Struct Biol 2022; 214:107899. [PMID: 36208858 DOI: 10.1016/j.jsb.2022.107899] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Revised: 08/16/2022] [Accepted: 09/19/2022] [Indexed: 12/07/2022]
Abstract
To investigate age and site-related changes to human dentin collagen, sound human teeth collected from donors aged 13-29 (young) and 50-74 (aged) years (n = 9/group) were cut to shallow and deep sites. Dentin collagen orientation and fibril bundling was investigated using the Picrosirius Red (PSR) stain observed under cross-polarized light microscopy (Pol), and collagen distribution was investigated using Confocal Laser Scanning Microscopy (CLSM). Collagen types III to I distribution in peritubular dentin (PTD) was revealed using Herovici stain and brightfield microscopy. Image analysis software and linear mixed modelling quantified outcomes. In situ dentin collagen was observed using Xenon Plasma Focussed Ion Beam Scanning Electron Microscopy (Xe PFIB-SEM). The PSR-Pol analysis revealed less coherently aligned and more bundled collagen fibrils in aged dentin (P = 0.005). Deep inner dentin collagen in both groups were less coherently aligned with reduced bundling. Regardless of age, CLSM showed collagen distribution remained stable; and more collagen type III was detectable in PTD located in inner dentin (Young: P = 0.006; Aged: P = 0.008). Observations following Xe PFIB-SEM cross-sectioning showed apatite-like deposits surrounding large intratubular collagen fibers, and evidence of smaller intertubular dentin collagen fibrils in situ. In conclusion, aging changes collagen network architecture, but not distribution or content.
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Affiliation(s)
- Arosha T Weerakoon
- School of Dentistry, The University of Queensland, Brisbane, Queensland, Australia.
| | - Nicholas Condon
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Australia
| | - Thomas R Cox
- Garvan Institute of Medical Research & School of Clinical Medicine, UNSW, Sydney, Australia
| | - Christopher Sexton
- School of Dentistry, The University of Queensland, Brisbane, Queensland, Australia
| | - Crystal Cooper
- Central Analytical Research Facility, Queensland University of Technology, Brisbane, Queensland, Australia; Centre for Microscopy, Characterisation and Analysis, University of Western Australia, Perth, Western Australia, Australia
| | - Ian A Meyers
- School of Dentistry, The University of Queensland, Brisbane, Queensland, Australia
| | - David Thomson
- School of Dentistry, The University of Queensland, Brisbane, Queensland, Australia
| | - Pauline J Ford
- School of Dentistry, The University of Queensland, Brisbane, Queensland, Australia
| | - Sandrine Roy
- Translational Research Institute, Brisbane, Queensland, Australia; Olympus Life Science, Australia
| | - Anne L Symons
- School of Dentistry, The University of Queensland, Brisbane, Queensland, Australia
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23
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Maloo LM, Toshniwal SH, Reche A, Paul P, Wanjari MB. A Sneak Peek Toward Polyaryletherketone (PAEK) Polymer: A Review. Cureus 2022; 14:e31042. [DOI: 10.7759/cureus.31042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Accepted: 11/03/2022] [Indexed: 11/06/2022] Open
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24
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Sodium carboxymethyl cellulose-based extrafibrillar demineralization to optimize dentin bonding durability. Dent Mater 2022; 38:2096-2114. [DOI: 10.1016/j.dental.2022.11.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 10/02/2022] [Accepted: 11/06/2022] [Indexed: 11/27/2022]
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25
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Weerakoon AT, Cooper C, Sokolowski KA, Meyers IA, Thomson D, Ford PJ, Sexton C, Symons AL. Effect of dentine site on resin and cement adaptation tested using X-ray and electron microscopy to evaluate bond durability and adhesive interfaces. Eur J Oral Sci 2022; 130:e12890. [PMID: 35959863 DOI: 10.1111/eos.12890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Accepted: 07/18/2022] [Indexed: 01/07/2023]
Abstract
Glass ionomer (GI) cements and self-etch (SE) or universal adhesives after etching (ER) adapt variably with dentine. Dentine characteristics vary with depth (deep/shallow), location (central/peripheral), and microscopic site (intertubular/peritubular). To directly compare adhesion to dentine, non-destructive imaging and testing are required. Here, GI, ER, and SE adapted at different dentine depths, locations, and sites were investigated using micro-CT, xenon plasma focused ion beam scanning electron microscopy (Xe PFIB-SEM), and energy dispersive X-ray spectroscopy (EDS). Extracted molars were prepared to deep or shallow slices and treated with the three adhesives. Micro-CT was used to compare changes to air volume gaps, following thermocycling, and statistically analysed using a quantile regression model and Fisher's exact test. The three adhesives performed similarly across dentine depths and locations, yet no change or overall increases and decreases in gaps at all dentine depths and locations were measured. The Xe PFIB-SEM-milled dentine-adhesive interfaces facilitated high-resolution characterization, and element profiling revealed variations across the tooth-material interfaces. Dentine depth and location had no impact on adhesive durability, although microscopic differences were observed. Here we demonstrate how micro-CT and Xe PFIB-SEM can be used to compare variable dental materials without complex multi-stage specimen preparation to minimize artefacts.
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Affiliation(s)
| | - Crystal Cooper
- Institute for Future Environments, Central Analytical Research Facility, Queensland University of Technology, Brisbane, Queensland, Australia.,Centre for Microscopy, Characterisation, and Analysis, The University of Western Australia, Perth, Western Australia, Australia
| | | | - Ian Arthur Meyers
- School of Dentistry, The University of Queensland, Brisbane, Queensland, Australia
| | - David Thomson
- School of Dentistry, The University of Queensland, Brisbane, Queensland, Australia
| | - Pauline Jane Ford
- School of Dentistry, The University of Queensland, Brisbane, Queensland, Australia
| | - Christopher Sexton
- School of Dentistry, The University of Queensland, Brisbane, Queensland, Australia
| | - Anne Louise Symons
- School of Dentistry, The University of Queensland, Brisbane, Queensland, Australia
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26
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Inglês M, Vasconcelos e Cruz J, Mano Azul A, Polido M, Delgado AHS. Comparative Assessment of Different Pre-Treatment Bonding Strategies to Improve the Adhesion of Self-Adhesive Composites to Dentin. Polymers (Basel) 2022; 14:3945. [PMID: 36235894 PMCID: PMC9570807 DOI: 10.3390/polym14193945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2022] [Revised: 09/14/2022] [Accepted: 09/14/2022] [Indexed: 11/17/2022] Open
Abstract
The aim of this study is to compare the adhesive interface formed in dentin, using self-adhesive composites applied with different bonding strategies, by testing the microtensile bond strength (μTBS) and ultramorphology through the use of light microscopy. Permanent, sound human molars were randomly allocated to six experimental groups. The groups included a negative control group, where only etching was performed via EtchOnly; a positive control group where an adhesive was applied, OptiBondFL (OBFL); and an experimental group where a primer was applied using a co-curing strategy together with a composite (Primer_CoCuring). The samples were sectioned into microspecimens for μTBS (n = 8) and into 1-mm thick slabs for light microscopy using Masson’s trichrome staining protocol (n = 3). The statistical analysis included a two-way ANOVA for μTBS data and Tukey’s HSD was used as a post-hoc test (significance level of 5%; SPSS v. 26.0). The results of the μTBS revealed that the self-adhesive composite (F = 6.0, p < 0.018) and the bonding strategy (F = 444.1, p < 0.001) significantly affected the bond strength to dentin. However, their interactions were not significant (F = 1.2, p = 0.29). Etching dentin with no additional treatment revealed the lowest μTBS (VF_EtchOnly = 2.4 ± 0.8 MPa; CC_EtchOnly = 2.0 ± 0.4 MPa), which was significantly different from using a primer (VF_CoCu = 8.8 ± 0.8 MPa; CC_CoCu = 6.3 ± 1.0 MPa) or using the full adhesive (VF_OptiBondFL = 22.4 ± 0.3 MPa; CC_OptibondFL = 21.2 ± 0.4 MPa). Microscopy images revealed that the experimental Primer_CoCuring was the only group with no collagen fibers exposed to the dentin−composite interface. Overall, the use of a primer, within the limitations of this study, increased the bonding of the self-adhesive composite and provided sufficient infiltration of the collagen based on light-microscopic imaging.
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Affiliation(s)
- Magali Inglês
- Instituto Universitário Egas Moniz (IUEM), Monte de Caparica, 2829-511 Almada, Portugal
| | - Joana Vasconcelos e Cruz
- Instituto Universitário Egas Moniz (IUEM), Monte de Caparica, 2829-511 Almada, Portugal
- Centro de Investigação Interdisciplinar Egas Moniz (CiiEM), Monte de Caparica, 2829-511 Almada, Portugal
| | - Ana Mano Azul
- Instituto Universitário Egas Moniz (IUEM), Monte de Caparica, 2829-511 Almada, Portugal
- Centro de Investigação Interdisciplinar Egas Moniz (CiiEM), Monte de Caparica, 2829-511 Almada, Portugal
| | - Mário Polido
- Instituto Universitário Egas Moniz (IUEM), Monte de Caparica, 2829-511 Almada, Portugal
- Centro de Investigação Interdisciplinar Egas Moniz (CiiEM), Monte de Caparica, 2829-511 Almada, Portugal
| | - António H. S. Delgado
- Instituto Universitário Egas Moniz (IUEM), Monte de Caparica, 2829-511 Almada, Portugal
- Centro de Investigação Interdisciplinar Egas Moniz (CiiEM), Monte de Caparica, 2829-511 Almada, Portugal
- Division of Biomaterials & Tissue Engineering, UCL Eastman Dental Institute, University College London, Royal Free Hospital, Rowland Hill Street, Hampstead, London NW3 2PF, UK
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27
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Franca CM, Balbinot GDS, Cunha D, Saboia VDPA, Ferracane J, Bertassoni LE. In-vitro models of biocompatibility testing for restorative dental materials: From 2D cultures to organs on-a-chip. Acta Biomater 2022; 150:58-66. [PMID: 35933103 PMCID: PMC9814917 DOI: 10.1016/j.actbio.2022.07.060] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2022] [Revised: 07/13/2022] [Accepted: 07/28/2022] [Indexed: 02/08/2023]
Abstract
Dental caries is a biofilm-mediated, diet-modulated, multifactorial and dynamic disease that affects more than 90% of adults in Western countries. The current treatment for decayed tissue is based on using materials to replace the lost enamel or dentin. More than 500 million dental restorations are placed annually worldwide, and materials used for these purposes either directly or indirectly interact with dentin and pulp tissues. The development and understanding of the effects of restorative dental materials are based on different in-vitro and in-vivo tests, which have been evolving with time. In this review, we first discuss the characteristics of the tooth and the dentin-pulp interface that are unique for materials testing. Subsequently, we discuss frequently used in-vitro tests to evaluate the biocompatibility of dental materials commonly used for restorative procedures. Finally, we present our perspective on the future directions for biological research on dental materials using tissue engineering and organs on-a-chip approaches. STATEMENT OF SIGNIFICANCE: Dental caries is still the most prevalent infectious disease globally, requiring more than 500 million restorations to be placed every year. Regrettably, the failure rates of such restorations are still high. Those rates are partially based on the fact that current platforms to test dental materials are somewhat inaccurate in reproducing critical components of the complex oral microenvironment. Thus, there is a collective effort to develop new materials while evolving the platforms to test them. In this context, the present review critically discusses in-vitro models used to evaluate the biocompatibility of restorative dental materials and brings a perspective on future directions for tissue-engineered and organs-on-a-chip platforms for testing new dental materials.
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Affiliation(s)
- Cristiane Miranda Franca
- Department of Restorative Dentistry, School of Dentistry, Oregon Health & Science University, Portland, OR, United States
| | - Gabriela de Souza Balbinot
- Dental Materials Laboratory, School of Dentistry, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Diana Cunha
- Post-Graduation Program in Dentistry, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | | | - Jack Ferracane
- Department of Restorative Dentistry, School of Dentistry, Oregon Health & Science University, Portland, OR, United States
| | - Luiz E Bertassoni
- Department of Restorative Dentistry, School of Dentistry, Oregon Health & Science University, Portland, OR, United States; Center for Regenerative Medicine, School of Medicine, Oregon Health & Science University, Portland, OR, United States; Department of Biomedical Engineering, School of Medicine, Oregon Health & Science University, Portland, OR, United States; Cancer Early Detection Advanced Research Center (CEDAR), Knight Cancer Institute, Portland, OR, United States.
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28
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H S Delgado A, Belmar Da Costa M, Polido MC, Mano Azul A, Sauro S. Collagen-depletion strategies in dentin as alternatives to the hybrid layer concept and their effect on bond strength: a systematic review. Sci Rep 2022; 12:13028. [PMID: 35906302 PMCID: PMC9338246 DOI: 10.1038/s41598-022-17371-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2022] [Accepted: 07/25/2022] [Indexed: 01/01/2023] Open
Abstract
Strategies aiming to improve the longevity of resin-dentin adhesive interface developed so far have only been able to retard the problem. Different approaches are thus needed. The objective of this review was to determine whether the use of collagen-depletion strategies after acid-etching procedures may improve the bond strength of resin-based materials to dentin. A systematic review was planned following 2021 PRISMA statement guidelines, with a search strategy performed in five electronic databases: PubMed/Medline, Scopus, EMBASE, SciELO and IADR Abstract Archive (last search: 17/01/2022). Inclusion criteria encompassed studies which evaluated a collagen-depletion strategy in acid-etched human dentin and tensile/shear bond strength tests. Risk of bias assessment was carried out by two reviewers, working independently on an adapted five-domain risk of bias (RoB) checklist for laboratory studies. Results were synthesized qualitatively, as a meta-analysis was not possible due to limited number of studies and their RoB. A total of eight studies were eligible for inclusion in the systematic review after inclusion/exclusion criteria application. Out of these, two evaluated the effect of using NaOCl followed by an antioxidant, and the remaining six evaluated different enzymatic treatments (bromelain, chondroitinase ABC, papain, and trypsin). None of the studies reported a decrease of bond strength when a collagen-depletion strategy was used, in comparison to traditional hybrid layers (control). All enzymatic treatment studies which respected the inclusion criteria improved the bond strength to dentin. Some specific collagen-depletion strategies seem to play a favorable role in improving immediate bond strengths to dentin. Further research with sound methodology is required to consolidate these findings, since limitations in RoB and a low number of studies were found. The assessment of further proteolytic agents and long-term outcomes is also required.
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Affiliation(s)
- António H S Delgado
- Centro de Investigação Interdisciplinar Egas Moniz (CiiEM), Instituto Universitário Egas Moniz (IUEM), Campus Universitário, Quinta da Granja, Monte de Caparica, 2829-511, Almada, Portugal. .,Division of Biomaterials and Tissue Engineering, UCL Eastman Dental Institute, University College London, London, UK.
| | - Madalena Belmar Da Costa
- Centro de Investigação Interdisciplinar Egas Moniz (CiiEM), Instituto Universitário Egas Moniz (IUEM), Campus Universitário, Quinta da Granja, Monte de Caparica, 2829-511, Almada, Portugal
| | - Mário Cruz Polido
- Centro de Investigação Interdisciplinar Egas Moniz (CiiEM), Instituto Universitário Egas Moniz (IUEM), Campus Universitário, Quinta da Granja, Monte de Caparica, 2829-511, Almada, Portugal
| | - Ana Mano Azul
- Centro de Investigação Interdisciplinar Egas Moniz (CiiEM), Instituto Universitário Egas Moniz (IUEM), Campus Universitário, Quinta da Granja, Monte de Caparica, 2829-511, Almada, Portugal
| | - Salvatore Sauro
- Dental Biomaterials and Minimally Invasive Dentistry, Department of Dentistry, Cardenal Herrera-CEU University, CEU Universities, Valencia, Spain
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Xu H, Ye Z, Zhang A, Lin F, Fu J, Fok ASL. Effects of concentration of sodium hypochlorite as an endodontic irrigant on the mechanical and structural properties of root dentine: A laboratory study. Int Endod J 2022; 55:1091-1102. [PMID: 35833329 PMCID: PMC9545283 DOI: 10.1111/iej.13800] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 07/03/2022] [Accepted: 07/04/2022] [Indexed: 11/30/2022]
Abstract
AIM The use of high-concentration sodium hypochlorite (NaOCl) as an endodontic irrigant remains controversial because of its potential impact on the fracture strength of endodontically-treated teeth. This study evaluated the effects of using different NaOCl concentrations, with 2-min-ethylenediaminetetraacetic acid (EDTA) as the final active irrigant, on the biomechanical and structural properties of root dentine. METHODOLOGY A new test method, which is more clinically relevant, was utilized to calculate the fracture strength of root dentine. Bovine incisors were used to obtain root dentine discs. The root canals were enlarged to mean diameter of 2.90 mm with a taper of 0.06. The resulting discs were divided into 5 groups (n=20) and treated with different concentrations of NaOCl (5.25%, 2.5%, and 1.3%) for 30 min plus 17% EDTA for 2 min. The discs were then loaded to fracture by a steel rod with the same taper through the central hole. The fractured specimens were examined by scanning electron microscopy to evaluate changes in the dimensions of the remaining intertubular dentine and the tubular radius. Micro-hardness was also measured with a Knoop diamond indenter along a radius to determine the depth of dentine eroded by the irrigation. Results were analyzed by one-way ANOVA and the Tukey test. The level of significance was set at α = 0.05. RESULTS The damage by NaOCl increased with its concentration. 5.25% NaOCl greatly reduced the fracture strength of root dentine from 172.10±30.13 MPa to 114.58±26.74 MPa. The corresponding reduction in micro-hardness at the root canal wall was 34.1%. The damages reached a depth of up to 400 μm (p < 0.05). Structural changes involved degradation of the intratubular wall leading to enlarged dentinal tubules and the loss of intertubular dentine. Changes in the microstructural parameters showed positive linear relationships with the fracture strength. CONCLUSIONS With the adjunctive use of EDTA, NaOCl caused destruction to the intratubular surface near the root canal and, consequently, reduced the root dentine's mechanical strength. The higher the concentration of NaOCl, the greater the effect. Therefore, endodontists should avoid using overly high concentration of NaOCl for irrigation to prevent potential root fracture in endodontically-treated teeth.
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Affiliation(s)
- Haiping Xu
- Department of Stomatology, the Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, China.,Minnesota Dental Research Center for Biomaterials and Biomechanics, School of Dentistry, University of Minnesota, MN, United States
| | - Zhou Ye
- Minnesota Dental Research Center for Biomaterials and Biomechanics, School of Dentistry, University of Minnesota, MN, United States.,Applied Oral Sciences and Community Dental Care, Faculty of Dentistry, The University of Hong Kong, Hong Kong S.A.R, China
| | - Anqi Zhang
- Minnesota Dental Research Center for Biomaterials and Biomechanics, School of Dentistry, University of Minnesota, MN, United States
| | - Fei Lin
- Department of Cariology and Endodontology, Peking University School and Hospital of Stomatology, Beijing, China
| | - Jing Fu
- Department of Stomatology, the Affiliated Hospital of Qingdao University, Qingdao University, Qingdao, China
| | - Alex S L Fok
- Minnesota Dental Research Center for Biomaterials and Biomechanics, School of Dentistry, University of Minnesota, MN, United States
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Interactions of two phosphate ester monomers with hydroxyapatite and collagen fibers and their contributions to dentine bond performance. J Dent 2022; 122:104159. [PMID: 35550398 DOI: 10.1016/j.jdent.2022.104159] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Revised: 03/24/2022] [Accepted: 05/08/2022] [Indexed: 11/20/2022] Open
Abstract
OBJECTIVES To evaluate the interactions of two phosphate ester monomers [10-methacryloyloxydecyl dihydrogen phosphate (10-MDP) and dipentaerythritol penta-acrylate phosphate (PENTA)] with hydroxyapatite and collagen and understand their influence on dentine bonding. METHODS Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, nuclear magnetic resonance, ultraviolet-visible, and molecular docking were applied for separately evaluating the interactions of two monomers with hydroxyapatite and collagen. Hydrophilicity tests and morphological observation were employed to characterize pretreated dentine. Microtensile bond strength (μTBS) and nanoleakage were investigated to evaluate the bonding performance. Hydroxyproline assay, in situ zymography, and matrix metalloproteinase-9 (MMP-9) activity assay were used to confirm the MMP inhibition. RESULTS Chemoanalytic characterization confirmed the interactions of 10-MDP and PENTA with hydroxyapatite and collagen. The interactions of PENTA were weaker than 10-MDP. PENTA possessed better dentine tubule sealing after etching than 10-MDP. Dentine treated with PENTA was more hydrophilic than 10-MDP. 10-MDP and PENTA treating significantly increased the initial μTBS than the control group without primer conditioning. μTBS decreased significantly during aging, and the decrease was more severe in the PENTA group than 10-MDP. The 10-MDP and PENTA groups exhibited relatively less fluorescence than the control. The relative inhibition percentages of MMP-9 decreased in the order of 10-MDP-Ca salt, 10-MDP and PENTA. The 10-MDP, PENTA, and 10-MDP-Ca salt groups showed significantly lower hydroxyproline contents than the control. CONCLUSIONS Although PENTA adsorbed on hydroxyapatite, it did not form a stable calcium salt. The interactions of 10-MDP with hydroxyapatite and collagen are different than those of PENTA. CLINICAL SIGNIFICANCE The sealing of dentinal tubules by PENTA and the inhibition of MMP by 10-MDP and its calcium salts contribute to improving the dentine bonding durability.
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Improving Properties of an Experimental Universal Adhesive by Adding a Multifunctional Dendrimer (G-IEMA): Bond Strength and Nanoleakage Evaluation. Polymers (Basel) 2022; 14:polym14071462. [PMID: 35406335 PMCID: PMC9002522 DOI: 10.3390/polym14071462] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2022] [Revised: 03/21/2022] [Accepted: 03/22/2022] [Indexed: 02/04/2023] Open
Abstract
A vast number of adhesive formulations exist currently. However, available adhesives still have several drawbacks such as increased hydrophilicity, polymerization deficiency, potential cytotoxicity and limited monomer interdiffusion within dentin. To improve material properties, a Bisphenol A-free adhesive containing a novel dendrimer G(2)-isocyanatoethyl methacrylate (G-IEMA) in replacement of Bis-GMA was made and tested. Sound human molars were sectioned to expose mid-coronal dentin, which was bonded using four adhesives—Futurabond, Scotchbond Universal and experimentals EM1 and EM2. The experimental adhesive EM2 contained G-IEMA, while EM1 had Bis-GMA. Groups were further allocated to two different adhesive strategies: etch-and-rinse (20 s etching) or self-etch. Immediate (24 h) microtensile bond strength to dentin (n = 5) was tested using a universal testing machine (1 mm/min, 5 kN; Shimadzu AGS-X Autograph, Tokyo, Japan), while the ultrastructure of the interface (n = 2) was assessed using scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS). Nanoleakage expression was evaluated using silver nitrate penetration and posterior SEM-EDS analysis (n = 3). Linear mixed models/Generalized models were used for inferential statistics (5% significance level). Bond strength results did not depend on the adhesive choice, although differences were found between strategies (p < 0.001). Regarding nanoleakage, when applied in an etch-and-rinse mode, experimental adhesives scored lower nanoleakage means than Futurabond and Scotchbond Universal. The novel adhesive shows interesting interfacial properties, with favorable nanoleakage results and a bond strength to dentin that matches current commercial adhesives.
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Neshatian M, Holcroft J, Kishen A, De Souza G, Ganss B. Promoting mineralization at biological interfaces Ex vivo with novel amelotin-based bio-nano complexes. Mater Today Bio 2022; 14:100255. [PMID: 35464740 PMCID: PMC9020105 DOI: 10.1016/j.mtbio.2022.100255] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Revised: 04/01/2022] [Accepted: 04/02/2022] [Indexed: 12/31/2022] Open
Abstract
Conclusion AMTN/AMTN-Col functionalized HANP are potent mineral-promoting bio-nano complexes. AMTN/AMTN-Col coated HANP promote collagen mineralization. AMTN/AMTN-Col coated HANP enhance resin-dentin bond strength. AMTN/AMTN-Col coated HANP are potential candidates for clinical application.
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Bonding interface and dentin enzymatic activity of two universal adhesives applied following different etching approaches. Dent Mater 2022; 38:907-923. [DOI: 10.1016/j.dental.2022.03.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Revised: 03/01/2022] [Accepted: 03/02/2022] [Indexed: 11/18/2022]
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Schepler H, Neufurth M, Wang S, She Z, Schröder HC, Wang X, Müller WE. Acceleration of chronic wound healing by bio-inorganic polyphosphate: In vitro studies and first clinical applications. Am J Cancer Res 2022; 12:18-34. [PMID: 34987631 PMCID: PMC8690915 DOI: 10.7150/thno.67148] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Accepted: 10/12/2021] [Indexed: 12/12/2022] Open
Abstract
The healing of chronic wounds is impaired by a lack of metabolic energy. In previous studies, we showed that physiological inorganic polyphosphate (polyP) is a generator of metabolic energy by forming ATP as a result of the enzymatic cleavage of the high-energy phosphoanhydride bonds of this polymer. Therefore, in the present study, we investigated whether the administration of polyP can substitute for the energy deficiency in chronic wound healing. Methods: PolyP was incorporated into collagen mats and applied in vitro and to patients in vivo. Results: (i) In vitro studies: Keratinocytes grown in vitro onto the polyP/collagen mats formed long microvilli to guide them to a favorable environment. HUVEC cells responded to polyP/collagen mats with an increased adhesion and migration propensity as well as penetration into the mats. (ii) In vivo - human clinical studies: In a “bench to bedside” process these promising in vitro results were translated from the laboratory into the clinic. In the proof-of-concept application, the engineered polyP/collagen mats were applied to chronic wounds in patients. Those mats impressively accelerated the re-epithelialization rate, with a reduction of the wound area to 65% after 3 weeks and to 36.6% and 22.5% after 6 and 9 weeks, respectively. Complete healing was achieved and no further treatment was necessary. Biopsy samples from the regenerating wound area showed predominantly myofibroblasts. The wound healing process was supported by the use of a polyP containing moisturizing solution. Conclusion: The results strongly recommend polyP as a beneficial component in mats for a substantial healing of chronic wounds.
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Citta M, Anovazzi G, Basso FG, Scheffel D, Zhou J, Pashley DH, Souza Costa CA, Hebling J. Mechanical Stability and Proteolytic Activity of Resin-dentin Bonds Using the Cross-linked Dry Bonding Technique. Oper Dent 2021; 46:E251-E263. [PMID: 34919726 DOI: 10.2341/20-016-l] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/19/2021] [Indexed: 11/23/2022]
Abstract
OBJECTIVE To evaluate the mechanical stability and the proteolytic activity of bonds created by a two-step, etch-and-rinse adhesive applied to cross-linked and air-dried etched dentin. METHODS Flat dentin surfaces were produced in 64 extracted sound human molars. The dentin was etched with 35% phosphoric acid for 15 seconds, and then the teeth were divided into groups according to the cross-linking solution applied on the etched dentin. Group 1: 5% grape seed extract (GSE), Group 2: 5% glutaraldehyde, Group 3: Gluma Desensitizer, or Group 4: deionized water (control). Solutions were applied for 60 seconds, followed by rinse and blot drying. Then, the teeth were separated into two subgroups where the etched dentin was kept moist or air-dried. The adhesive was applied followed by a composite resin buildup. After 24 hours, the teeth were cut into beams (0.81 mm2) that were tested for microtensile strength immediately or after 12 months of aging in a 37°C saliva-like buffer. Additional teeth (n=32) were bonded as described and cut into 0.5-mm-thick slabs. The slabs were prepared for nanoleakage (scanning electron microscopy) and in situ zymography (EnzChek Protease Assay Kit). Bond strength data were submitted to ANOVA and Tukey tests (α=0.05). RESULTS Significant reduction in immediate bond strength (ca 65%) and increase in proteolytic activity was seen when the etched dentin was air dried without previous cross-linking biomodification. Conversely, bond strengths did not differ from those produced on wet dentin when collagen was cross-linked before air drying, irrespective of the solution applied. For both moist and air-dried etched dentin, collagen cross-linking resulted in mechanically stable bonds and reduced proteolytic activity after 12 months of storage. CONCLUSION Bonds produced by the application of a two-step, etch-and-rinse adhesive to cross-linked, air-dried, etched dentin were mechanically stable and revealed reduced proteolytic activity after 1 year of aging.
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Affiliation(s)
- M Citta
- Mariana Citta, DDS, MSc, Department of Oral Rehabilitation, Sao Paulo State University (UNESP), School of Dentistry, SP, Brazil
| | - G Anovazzi
- Giovana Anovazzi, DDS, MSc, PhD, Department of Orthodontics and Pediatric Dentistry, Sao Paulo State University (UNESP), School of Dentistry, SP, Brazil
| | - F G Basso
- Fernanda Gonçalves Basso, DDS, MSc, PhD, Department of Oral Rehabilitation, Sao Paulo State University (UNESP), School of Dentistry, SP, Brazil
| | - Dls Scheffel
- Débora Lopes Salles Scheffel, DDS, MSc, PhD, Department of Dentistry, State University of Maringá, School of Dentistry, PR, Brazil
| | - J Zhou
- Jianfeng Zhou, DMD, PhD, Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing, PR China
| | - D H Pashley
- David Henry Pashley, DMD, PhD, Department of Oral Biology, The Dental College of Georgia, Augusta University, Augusta, GA, United States
| | - C A Souza Costa
- Carlos Alberto de Souza Costa, DDS, MSc, PhD, Department of Physiology and Pathology, Sao Paulo State University (UNESP), School of Dentistry, SP, Brazil
| | - J Hebling
- *Josimeri Hebling, DDS, MSc, PhD, Department of Orthodontics and Pediatric Dentistry, Sao Paulo State University (UNESP), School of Dentistry, SP, Brazil
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Li MX, Duan L, Chen ML, Tian FC, Fu BP. Effect of an extrafibrillar dentin demineralization strategy on the durability of the resin-dentin bond. J Mech Behav Biomed Mater 2021; 126:105038. [PMID: 34923366 DOI: 10.1016/j.jmbbm.2021.105038] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2021] [Revised: 12/05/2021] [Accepted: 12/07/2021] [Indexed: 11/26/2022]
Abstract
OBJECTIVES This study aimed to evaluate the potential of the extrafibrillar dentin demineralization strategy on the long-term dentin bond strength of an etch-and-rinse adhesive. METHODS A water-soluble glycol chitosan-EDTA (GCE), a chelating conditioner, was synthesized and subjected to size-exclusion dialysis to obtain molecules >40 kDa. The conjugation of EDTA to glycol chitosan was analyzed by Fourier transform infrared (FTIR) spectroscopy. Mid-coronal dentin surfaces of 80 teeth were either acid-etched with 35% phosphoric acid or conditioned with 25 mg/mL GCE (n = 40) and thoroughly water-sprayed before applying the etch-and-rinse adhesive Adper Single Bond Plus and placing Z250 composite resin (3 M Oral Care; St Paul, MN, USA). Resin-bonded specimens were prepared into beams with a cross-sectional area of about 0.9 mm2 vertically through the resin-dentin interfaces before the microtensile bond strengths (MTBS) were determined immediately or after 3, 6, or 12 months of water storage. The resin-dentin interfaces were analyzed using transmission electron microscopy (TEM). The MTBS data were analyzed using two-way ANOVA followed by the LSD post-hoc multiple comparisons (P < 0.05). RESULTS FTIR spectra showed that EDTA was successfully conjugated to glycol chitosan. The phosphoric acid-etching group and GCE-conditioning group showed similar bond strength values after 24 h of water storage. The bond strength of the phosphoric acid-etching group after 12-month water aging was significantly reduced from 51.61 ± 3.30 MPa to 38.57 ± 4.81 MPa, while the bond strength of the GCE-conditioning group was not significantly reduced from 50.28 ± 3.62 MPa to 46.40 ± 4.71 MPa.The degradation of the hybrid layer could be detected in the phosphoric acid-etching group after 12 months of water aging, but not in the GCE-conditioning group. CONCLUSION The extrafibrillar dentin demineralization strategy using GCE conditioner could defy the hybrid layer degradation of the dentin bond after 12 months of water aging and enhance the dentin bond durability of the etch-and-rinse adhesive Adper Single Bond Plus.
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Affiliation(s)
- Ming Xing Li
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Clinical Research Center for Oral Diseases of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou, China
| | - Lian Duan
- College of Sericulture, Textile and Biomass Sciences, Southwest University, Chongqing, China
| | - Mei Ling Chen
- Department of Stomatology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Fu Cong Tian
- The Dental College of Georgia, Augusta University, Augusta, GA, USA
| | - Bai Ping Fu
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Clinical Research Center for Oral Diseases of Zhejiang Province, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou, China.
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Xu J, Chen Y, Li X, Lei Y, Shu C, Luo Q, Chen L, Li X. Reconstruction of a Demineralized Dentin Matrix via Rapid Deposition of CaF 2 Nanoparticles In Situ Promotes Dentin Bonding. ACS APPLIED MATERIALS & INTERFACES 2021; 13:51775-51789. [PMID: 34693718 DOI: 10.1021/acsami.1c15787] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Dentin bonding based on a wet-bonding technique is the fundamental technique used daily in clinics for tooth-restoration fixation and clinical treatment of tooth-related diseases. Limited bonding durability led by insufficient adhesive infiltration in the demineralized dentin (DD) matrix is the biggest concern in contemporary adhesive dentistry. This study proposes that the highly hydrated noncollagenous protein (NCP)-formed interfacial microenvironment of the DD matrix is the root cause of this problem. Meanwhile, the endogenous phosphate groups of the NCPs are used as pseudonuclei to rapidly induce the formation of amorphous CaF2 nanoparticles in situ in the interfacial microenvironment. The DD matrix is thus reconstructed into a novel porous structure. It markedly facilitates the infiltration of dentin adhesives in the DD matrix and also endows the DD matrix with anticollapsing capability when water evaporates. Whether using a wet-bonding or air-drying mode, the bonding effectiveness is greatly promoted, with the 12 month bonding strength being about twice that of the corresponding control groups. This suggests that the nanoreinforced DD matrix eliminates the dependence of bonding effectiveness on the moisture status of the DD surface controlled only by experiences of dentists. Consequently, this bonding strategy not only greatly improves bonding durability but also overcomes the technical sensitivity of bonding operations of the total-etched bonding pattern. This exhibits the potential to promote dentin bonding and is of great significance to dentistry.
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Affiliation(s)
- Jiajia Xu
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Hangzhou 310006, P. R. China
- Zhejiang Provincial Clinical Research Center for Oral Disease, Hangzhou 310006, P. R. China
- Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou 310006, P. R. China
| | - Yadong Chen
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Hangzhou 310006, P. R. China
- Zhejiang Provincial Clinical Research Center for Oral Disease, Hangzhou 310006, P. R. China
- Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou 310006, P. R. China
| | - Xiaojun Li
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Hangzhou 310006, P. R. China
- Zhejiang Provincial Clinical Research Center for Oral Disease, Hangzhou 310006, P. R. China
- Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou 310006, P. R. China
| | - Yuqing Lei
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Hangzhou 310006, P. R. China
- Zhejiang Provincial Clinical Research Center for Oral Disease, Hangzhou 310006, P. R. China
- Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou 310006, P. R. China
| | - Chang Shu
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Hangzhou 310006, P. R. China
- Zhejiang Provincial Clinical Research Center for Oral Disease, Hangzhou 310006, P. R. China
- Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou 310006, P. R. China
| | - Qiaojie Luo
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Hangzhou 310006, P. R. China
- Zhejiang Provincial Clinical Research Center for Oral Disease, Hangzhou 310006, P. R. China
- Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou 310006, P. R. China
| | - Lili Chen
- Union Hospital, Tongji Medical College, Department of Stomatology, Huazhong University Science & Technology, 1277 Jiefang Ave., Wuhan 430022, Peoples R. China
| | - Xiaodong Li
- Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Hangzhou 310006, P. R. China
- Zhejiang Provincial Clinical Research Center for Oral Disease, Hangzhou 310006, P. R. China
- Key Laboratory of Oral Biomedical Research of Zhejiang Province, Cancer Center of Zhejiang University, Hangzhou 310006, P. R. China
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Distinct effects of polyphenols and solvents on dentin collagen crosslinking interactions and biostability. Dent Mater 2021; 37:1794-1805. [PMID: 34579958 DOI: 10.1016/j.dental.2021.09.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Revised: 09/03/2021] [Accepted: 09/13/2021] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To evaluate the effects of different polyphenols and solvents on dentin collagen's crosslinking interactions and biostabilization against MMPs and collagenase degradation. METHODS Two polyphenols [proanthocyanidin (PA) and quercetin (QC)] with different water solubility were prepared as treatment solutions using ethanol (EtOH) or dimethyl sulfoxide (DMSO) as solvents. 6-um-thick dentin films were microtomed from dentin slabs of third molars. Following demineralization, films or slabs were subject to 60-s treatment (PA or QC) or no treatment (control) with subsequent extended-rinse with original solvent (EtOH or DMSO) or distilled water (DW). Collagen crosslinking interactions were assessed by FTIR. Biostability was assessed through endogenous MMPs activity via confocal laser scanning microscopy, and exogenous collagenase degradation via weight loss, hydroxyproline release and SEM. Finally, direct collagenase inactivation was also evaluated. Data were analyzed by three-way ANOVA and post-hoc tests (α=0.05%). RESULTS Distinct effects of two polyphenols and solvents on collagen crosslinking and biostabilization were observed. Higher crosslinking and biostability efficacy occurred with PA than QC (p<0.001) that demonstrated negligible collagen interactions. With DMSO solvent, efficacy results were significantly reduced with both polyphenols (p<0.05). DMSO-rinse further weakened interactions of PA with collagen, diminishing biostability (p<0.05). Low biostability was detected with QC and DW-rinse, suggesting direct enzymatic inhibition due to physical presence in collagen. SIGNIFICANCE Collagen crosslinking interactions and biostability depend on polyphenol chemical characteristics. Treatment-solution solvents may affect interactions between polyphenols and collagen, specifically, DMSO showed detrimental effects on collagen crosslinking and biostability and should be used with caution.
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Toledano-Osorio M, Aguilera FS, Muñoz-Soto E, Osorio E, Toledano M, Escames G, Medina-Castillo AL, Osorio MT, López-López MT, Vallecillo-Rivas M, Osorio R. Melatonin-doped polymeric nanoparticles induce high crystalline apatite formation in root dentin. Dent Mater 2021; 37:1698-1713. [PMID: 34544591 DOI: 10.1016/j.dental.2021.09.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Accepted: 09/04/2021] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To investigate the effect of novel polymeric nanoparticles (NPs) doped with melatonin (ML) on nano-hardness, crystallinity and ultrastructure of the formed hydroxyapatite after endodontic treatment. METHODS Undoped-NPs and ML-doped NPs (ML-NPs) were tested at radicular dentin, after 24 h and 6 m. A control group without NPs was included. Radicular cervical and apical dentin surfaces were studied by nano-hardness measurements, X-ray diffraction and transmission electron microscopy. Mean and standard deviation were analyzed by ANOVA and Student-Newman-Keuls multiple comparisons (p < 0.05). RESULTS Cervical dentin treated with undoped NPs maintained its nano-hardness values after 6 m of storage being [24 h: 0.29 (0.01); 6 m: 0.30 (0.02) GPa], but it decreased at apical dentin [24 h: 0.36 (0.01); 6 m: 0.28 (0.02) GPa]. When ML-NPs were used, nano-hardness was similar over time [24h: 0.31 (0.02); 6 m: 0.28 (0.03) GPa], at apical dentin. Root dentin treated with ML-NPs produced, in general, high crystallinity of new minerals and thicker crystals than those produced in the rest of the groups. After 6 m, crystals became organized in randomly oriented polyhedral, square polygonal block-like apatite or drop-like apatite polycrystalline lattices when ML-NPs were used. Undoped NPs generated poor crystallinity, with preferred orientation of small crystallite and increased microstrain. SIGNIFICANCE New polycrystalline formations encountered in dentin treated with ML-NPs may produce structural dentin stability and high mechanical performance at the root. The decrease of mechanical properties over time in dentin treated without NPs indicates scarce remineralization potential, dentin demineralization and further potential degradation. The amorphous stage may provide high hydroxyapatite solubility and remineralizing activity.
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Affiliation(s)
- Manuel Toledano-Osorio
- University of Granada, Department of Stomatology, Colegio Máximo de Cartuja s/n, Granada 18071, Spain
| | - Fátima S Aguilera
- University of Granada, Department of Stomatology, Colegio Máximo de Cartuja s/n, Granada 18071, Spain
| | - Esther Muñoz-Soto
- University of Granada, Department of Stomatology, Colegio Máximo de Cartuja s/n, Granada 18071, Spain
| | - Estrella Osorio
- University of Granada, Department of Stomatology, Colegio Máximo de Cartuja s/n, Granada 18071, Spain
| | - Manuel Toledano
- University of Granada, Department of Stomatology, Colegio Máximo de Cartuja s/n, Granada 18071, Spain.
| | - Germaine Escames
- Faculty of Medicine, Department of Physiology, Biomedical Research Center, CIBERFES, Ibs. San Cecilio University Hospital, University of Granada, Granada, Spain
| | - Antonio L Medina-Castillo
- University of Granada, NanoMyP, Spin-Off Enterprise, Edificio BIC-Granada, Av. Innovación 1, 18016, Armilla, Granada, Spain
| | | | - Modesto T López-López
- University of Granada, Faculty of Science, Applied Physics Department, Av. Fuente Nueva s/n, 18071 Granada, Spain
| | - Marta Vallecillo-Rivas
- University of Granada, Department of Stomatology, Colegio Máximo de Cartuja s/n, Granada 18071, Spain
| | - Raquel Osorio
- University of Granada, Department of Stomatology, Colegio Máximo de Cartuja s/n, Granada 18071, Spain
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Cai J, Burrow MF, Manton DJ, Palamara JEA. Using Proanthocyanidin as a Root Dentin Conditioner for GIC Restorations. J Dent Res 2021; 100:1072-1080. [PMID: 34261333 DOI: 10.1177/00220345211018182] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Glass ionomer cements (GICs) are considered the material of choice for restoration of root carious lesions (RCLs). When bonding to demineralized dentin, the collapse of dentinal collagen during restorative treatment may pose challenges. Considering its acidic nature and collagen biomodification effects, proanthocyanidin (PAC) could be potentially used as a dentin conditioner to remove the smear layer while simultaneously acting to biomodify the dentinal collagen involved in the bonding interface. In this study, 6.5% w/v PAC was used as a conditioner for sound (SD) and laboratory demineralized (DD) root dentin before bonding to resin-modified GIC (FII), casein phosphopeptide-amorphous calcium phosphate (CPP-ACP)-modified GIC (FVII), or a high-viscosity GIC (FIX). Root dentin conditioned with deionized distilled water (DDW) or polyacrylic acid (PAA) served as controls. Results indicated FII showed higher shear bond strength (SBS) on SD than the other 2 GICs, especially in PAA-conditioned samples; FIX showed significantly higher SBS than FII and FVII on PAA- or PAC-conditioned DD. In each category of GIC, PAA and PAC did not have a significant influence on SBS in most cases compared to DDW except for a significant decrease in PAC-conditioned SD bonded to FII and a significant increase in PAA-conditioned DD bonded to FIX. The bonding interface between GIC and SD was generally more resistant to the acid-base challenge than DD. Although the alterations in failure modes indicated a compromised interfacial interaction between GICs and PAC-treated root dentin, biomodification effects of PAC on dentin were observed from Raman microspectroscopy analysis in terms of the changes in mineral-to-matrix ratio and hydroxyproline-to-proline ratio of dentin adjacent to the bonding interface, especially of DD. Results from this study also indicated the possibility of using in situ characterization such as Raman microspectroscopy as a complementary approach to SBS test to investigate the integrity of the bonding interface.
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Affiliation(s)
- J Cai
- Melbourne Dental School, The University of Melbourne, Carlton, VIC, Australia
| | - M F Burrow
- Melbourne Dental School, The University of Melbourne, Carlton, VIC, Australia.,The University of Hong Kong, Prince Philip Dental Hospital, Sai Ying Pun, Hong Kong SAR, China
| | - D J Manton
- Melbourne Dental School, The University of Melbourne, Carlton, VIC, Australia.,Centrum voor Tandheelkunde en Mondzorgkunde, UMCG, University of Groningen, The Netherlands
| | - J E A Palamara
- Melbourne Dental School, The University of Melbourne, Carlton, VIC, Australia
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Yu F, Luo ML, Xu RC, Huang L, Yu HH, Meng M, Jia JQ, Hu ZH, Wu WZ, Tay FR, Xiao YH, Niu LN, Chen JH. A novel dentin bonding scheme based on extrafibrillar demineralization combined with covalent adhesion using a dry-bonding technique. Bioact Mater 2021; 6:3557-3567. [PMID: 33842741 PMCID: PMC8022110 DOI: 10.1016/j.bioactmat.2021.03.024] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Revised: 02/26/2021] [Accepted: 03/11/2021] [Indexed: 01/21/2023] Open
Abstract
Dentin bonding is a dynamic process that involves the penetration of adhesive resin monomers into the extrafibrillar and intrafibrillar demineralized collagen matrix using a wet-bonding technique. However, adhesive resin monomers lack the capacity to infiltrate the intrafibrillar space, and the excess water that is introduced by the wet-bonding technique remains at the bonding interface. This imperfectly bonded interface is inclined to hydrolytic degradation, severely jeopardizing the longevity of bonded clinical restorations. The present study introduces a dentin bonding scheme based on a dry-bonding technique, combined with the use of extrafibrillar demineralization and a collagen-reactive monomer (CRM)-based adhesive (CBA). Selective extrafibrillar demineralization was achieved using 1-wt% high-molecular weight (MW) carboxymethyl chitosan (CMCS) within a clinically acceptable timeframe to create a less aggressive bonding substance for dentin bonding due to its selectively extrafibrillar demineralization capacity. CMCS demineralization decreased the activation of in situ collagenase, improved the shrinking resistance of demineralized collagen, and thus provided stronger and more durable bonding than traditional phosphoric acid etching. The new dentin bonding scheme that contained CMCS and CBA and used a dry-bonding technique achieved an encouraging dentin bonding strength and durability with low technical sensitivity. This bonding scheme can be used to improve the stability of the resin-dentin interface and foster the longevity of bonded clinical restorations.
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Affiliation(s)
- F Yu
- Department of Stomatology, 920 Hospital of Joint Logistics Support Force, PLA, Kunming, 650032, China
| | - M L Luo
- Department of Stomatology, The First Medical Center, Chinese PLA General Hospital, Beijing, China
| | - R C Xu
- Department of Stomatology, The First Medical Center, Chinese PLA General Hospital, Beijing, China.,Department of Stomatology, The Third Medical Center, Chinese PLA General Hospital, Beijing, China
| | - L Huang
- Department of General Dentistry and Emergency, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - H H Yu
- National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Stomatology, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - M Meng
- National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Stomatology, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - J Q Jia
- Department of Stomatology, The First Medical Center, Chinese PLA General Hospital, Beijing, China
| | - Z H Hu
- Department of Stomatology, 920 Hospital of Joint Logistics Support Force, PLA, Kunming, 650032, China
| | - W Z Wu
- Department of Stomatology, 920 Hospital of Joint Logistics Support Force, PLA, Kunming, 650032, China
| | - F R Tay
- The Dental College of Georgia, Augusta University, Augusta, GA, 30912, USA
| | - Y H Xiao
- Department of Stomatology, 920 Hospital of Joint Logistics Support Force, PLA, Kunming, 650032, China
| | - L N Niu
- National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Stomatology, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi'an, China
| | - J H Chen
- National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Stomatology, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi'an, China
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Contessi Negrini N, Angelova Volponi A, Higgins C, Sharpe P, Celiz A. Scaffold-based developmental tissue engineering strategies for ectodermal organ regeneration. Mater Today Bio 2021; 10:100107. [PMID: 33889838 PMCID: PMC8050778 DOI: 10.1016/j.mtbio.2021.100107] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Revised: 02/15/2021] [Accepted: 02/27/2021] [Indexed: 12/12/2022] Open
Abstract
Tissue engineering (TE) is a multidisciplinary research field aiming at the regeneration, restoration, or replacement of damaged tissues and organs. Classical TE approaches combine scaffolds, cells and soluble factors to fabricate constructs mimicking the native tissue to be regenerated. However, to date, limited success in clinical translations has been achieved by classical TE approaches, because of the lack of satisfactory biomorphological and biofunctional features of the obtained constructs. Developmental TE has emerged as a novel TE paradigm to obtain tissues and organs with correct biomorphology and biofunctionality by mimicking the morphogenetic processes leading to the tissue/organ generation in the embryo. Ectodermal appendages, for instance, develop in vivo by sequential interactions between epithelium and mesenchyme, in a process known as secondary induction. A fine artificial replication of these complex interactions can potentially lead to the fabrication of the tissues/organs to be regenerated. Successful developmental TE applications have been reported, in vitro and in vivo, for ectodermal appendages such as teeth, hair follicles and glands. Developmental TE strategies require an accurate selection of cell sources, scaffolds and cell culture configurations to allow for the correct replication of the in vivo morphogenetic cues. Herein, we describe and discuss the emergence of this TE paradigm by reviewing the achievements obtained so far in developmental TE 3D scaffolds for teeth, hair follicles, and salivary and lacrimal glands, with particular focus on the selection of biomaterials and cell culture configurations.
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Affiliation(s)
| | - A. Angelova Volponi
- Centre for Craniofacial and Regenerative Biology, King's College London, London, UK
| | - C.A. Higgins
- Department of Bioengineering, Imperial College London, London, UK
| | - P.T. Sharpe
- Centre for Craniofacial and Regenerative Biology, King's College London, London, UK
| | - A.D. Celiz
- Department of Bioengineering, Imperial College London, London, UK
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The effect of prime-and-rinse approach using MDP micellar solutions on extrafibrillar demineralization and dentin bond performance. Dent Mater 2021; 37:e300-e313. [PMID: 33581909 DOI: 10.1016/j.dental.2021.01.018] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Revised: 11/06/2020] [Accepted: 01/20/2021] [Indexed: 01/10/2023]
Abstract
OBJECTIVE This study investigated the effects of prime-and-rinse approach using 10-methacryloyloxydecyl dihydrogen phosphate (MDP) micellar solutions on extrafibrillar demineralization and dentin bond performance of etch-and-rinse adhesive. METHODS The micellar solutions were prepared by adding 15% MDP in two ethanol-aqueous (75:25, 55:45 V/V%) solutions, referring to MDP/EtOH75 and MDP/EtOH55. After mid-coronal dentin surfaces were either etched (control) or conditioned with MDP/EtOH75 and MDP/EtOH55 and rinsed, they were applied with adhesive (Adpter Single Bond 2) in dry- or wet-bonding mode and placed with composite resin (Filtek Z350 XT). They were prepared into multiple micro-beams for micro-tensile bond strengths (MTBS) testing after storage in water for 24 h or subjecting to thermocycling. The other pretreated dentin surfaces were analyzed by TF-XRD, ATR-FTIR, HRTEM, FE-SEM, contact angle measurement and nanoindentation testing. The MTBS data was analyzed with two-way ANOVA followed by LSD post-hoc test. RESULTS MDP/EtOH75 produced significantly greater MTBS values than MDP/EtOH55 and control after thermocycling aging in dry- or wet-bonding mode (P < 0.05). The ATR-FTIR spectrums shows that ratios of phosphate/monomer (1,034 cm-1/1,716 cm-1) on MDP/EtOH75-, MDP/EtOH55-treated dentin surfaces are 0.51 and 0.23, respectively. This is confirmed by HRTEM images and SAED pattern that intrafibrillar minerals were mostly preserved after treatment with MDP/EtOH75. MDP/EtOH75 produced significantly higher elastic modulus and nanohardness on pretreated dentin surface than MDP/EtOH55 (P < 0.05). TF-XRD pattern shows some MDP-Ca salts remained on the primed dentin surface. SIGNIFICANCE Prime-and-rinse approach using MDP/EtOH75 micellar solution could produce mostly extrafibrillar demineralization, and greatly increase dentin bond durability in dry- or wet-bonding mode.
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Kuntze MM, Mendes Souza BD, Schmidt TF, de Almeida J, Bortoluzzi EA, Felippe WT. Scanning electron microscopy evaluation of dentin ultrastructure after surface demineralization. J Conserv Dent 2021; 23:512-517. [PMID: 33911362 PMCID: PMC8066673 DOI: 10.4103/jcd.jcd_102_19] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2019] [Revised: 04/10/2020] [Accepted: 06/26/2020] [Indexed: 12/03/2022] Open
Abstract
Context: Knowledge about dentin microstructure is essential for execution of clinical procedures which require adhesion of materials to dentin. Aims: To evaluate by scanning electron microscopy (SEM) the dentin ultrastructure after demineralization with 6 M and 12 M hydrochloric acid (HCl). Subjects and Methods: Twenty dentin segments were immersed in fixative solution and dehydrated in ethanol. After 24 h, segments were randomly divided into 2 groups (n = 10), demineralized with 6 M HCl (G6M) and 12 M HCl (G12M), and prepared for SEM analysis. Statistical Analysis Used: Based on photomicrographs and chemical composition (energy dispersive X-ray spectroscopy) of dentin, a descriptive analysis was conducted. Results: G6M samples revealed a demineralized surface with peritubular dentin exposure and small magnification of the dentinal tubules openings. The intertubular dentin was partially demineralized. Demineralization of G12M samples was more aggressive and at different depths, promoting erosion and “detachment” of dentin layers. Peritubular dentin was observed on the dentin surface. There was a large magnification of the dentinal tubules openings. In both groups, tubular structures showed a similar chemical composition to the intertubular dentin. Lamina limitans was not observed. Conclusions: Dentin demineralization is dependent on the HCl molarity and promotes exposure of peritubular dentin.
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Affiliation(s)
- Morgane Marion Kuntze
- Department of Dentistry, Federal University of Santa Catarina, Florianópolis, Brazil
| | | | | | - Josiane de Almeida
- Department of Endodontics, University of Southern Santa Catarina, Palhoça, Santa Catarina, Brazil
| | | | - Wilson Tadeu Felippe
- Department of Dentistry, Federal University of Santa Catarina, Florianópolis, Brazil
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Sarikaya R, Song L, Yuca E, Xie SX, Boone K, Misra A, Spencer P, Tamerler C. Bioinspired multifunctional adhesive system for next generation bio-additively designed dental restorations. J Mech Behav Biomed Mater 2021; 113:104135. [PMID: 33160267 PMCID: PMC8101502 DOI: 10.1016/j.jmbbm.2020.104135] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2020] [Revised: 07/17/2020] [Accepted: 10/07/2020] [Indexed: 12/16/2022]
Abstract
Resin-based composite has overtaken dental amalgam as the most popular material for the repair of lost or damaged tooth structure. In spite of the popularity, the average composite lifetime is about half that of amalgam restorations. The leading cause of composite-restoration failure is decay at the margin where the adhesive is applied. The adhesive is intended to seal the composite/tooth interface, but the adhesive seal to dentin is fragile and readily degraded by acids, enzymes and other oral fluids. The inherent weakness of this material system is attributable to several factors including the lack of antimicrobial properties, remineralization capabilities and durable mechanical performance - elements that are central to the integrity of the adhesive/dentin (a/d) interfacial seal. Our approach to this problem offers a transition from a hybrid to a biohybrid structure. Discrete peptides are tethered to polymers to provide multi-bio-functional adhesive formulations that simultaneously achieve antimicrobial and remineralization properties. The bio-additive materials design combines several functional properties with the goal of providing an adhesive that will serve as a durable barrier to recurrent decay at the composite/tooth interface. This article provides an overview of our multi-faceted approach which uses peptides tethered to polymers and new polymer chemistries to achieve the next generation adhesive system - an adhesive that provides antimicrobial properties, repair of defective dentin and enhanced mechanical performance.
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Affiliation(s)
- Rizacan Sarikaya
- Institute for Bioengineering Research (IBER), University of Kansas (KU), 1530 W. 15th St, Lawrence, KS, 66045, USA; Department of Mechanical Engineering, University of Kansas (KU), 1530 W. 15th St, Lawrence, KS, 66045, USA
| | - Linyong Song
- Institute for Bioengineering Research (IBER), University of Kansas (KU), 1530 W. 15th St, Lawrence, KS, 66045, USA
| | - Esra Yuca
- Institute for Bioengineering Research (IBER), University of Kansas (KU), 1530 W. 15th St, Lawrence, KS, 66045, USA; Department of Molecular Biology and Genetics, Yildiz Technical University, Istanbul, 34210, Turkey
| | - Sheng-Xue Xie
- Institute for Bioengineering Research (IBER), University of Kansas (KU), 1530 W. 15th St, Lawrence, KS, 66045, USA
| | - Kyle Boone
- Institute for Bioengineering Research (IBER), University of Kansas (KU), 1530 W. 15th St, Lawrence, KS, 66045, USA; Bioengineering Program, University of Kansas, 1530 W. 15th St, University of Kansas (KU), Lawrence, KS, 66045, USA
| | - Anil Misra
- Institute for Bioengineering Research (IBER), University of Kansas (KU), 1530 W. 15th St, Lawrence, KS, 66045, USA; Civil, Environmental and Architectural Engineering Department, University of Kansas (KU), 1530 W. 15th St, Lawrence, KS, 66045, USA
| | - Paulette Spencer
- Institute for Bioengineering Research (IBER), University of Kansas (KU), 1530 W. 15th St, Lawrence, KS, 66045, USA; Department of Mechanical Engineering, University of Kansas (KU), 1530 W. 15th St, Lawrence, KS, 66045, USA; Bioengineering Program, University of Kansas, 1530 W. 15th St, University of Kansas (KU), Lawrence, KS, 66045, USA
| | - Candan Tamerler
- Institute for Bioengineering Research (IBER), University of Kansas (KU), 1530 W. 15th St, Lawrence, KS, 66045, USA; Department of Mechanical Engineering, University of Kansas (KU), 1530 W. 15th St, Lawrence, KS, 66045, USA; Bioengineering Program, University of Kansas, 1530 W. 15th St, University of Kansas (KU), Lawrence, KS, 66045, USA.
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Cai J, Burrow MF, Manton DJ, Hardiman R, Palamara JEA. Remineralising effects of fluoride varnishes containing calcium phosphate on artificial root caries lesions with adjunctive application of proanthocyanidin. Dent Mater 2020; 37:143-157. [PMID: 33267974 DOI: 10.1016/j.dental.2020.10.021] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Revised: 08/13/2020] [Accepted: 10/24/2020] [Indexed: 11/18/2022]
Abstract
OBJECTIVES To evaluate the remineralising effects of fluoride (F) varnishes containing bioavailable calcium-phosphate compound (Ca-P) based remineralisation systems and 5000 ppm F toothpaste (FTP) on root caries lesions (RCLs) and the potential effects of proanthocyanidin (PA) for the treatments of RCLs when used as an adjunct to F regimens. METHODS Demineralised root dentine and a pH-cycling model were used to mimic RCLs and the oral environment. Remineralising effects of MI VarnishTM (MIV) containing casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) and Clinpro™ White Varnish (CPWV) containing tri-calcium phosphate (TCP) along with FTP and PA were evaluated regarding the birefringence, elemental composition, mechanical properties and mineral density of remineralised dentine with DuraphatTM as a comparison. RESULTS MIV, CPWV and DuraphatTM promoted the incorporation of F into RCLs and increased mineral density but did not change microhardness of root dentine significantly. Surface microhardness increased significantly when MIV or CPWV was used with 5000 ppm FTP. Application of PA with F regimens significantly increased subsurface mineral density. When PA was applied with MIV or CPWV along with FTP, the highest ion uptake and relative mineral gain (%ΔZ) was achieved, and significant increase of microhardness was up to 30 μm depth. Generally, MIV was associated with a higher mineral content gain than CPWV. SIGNIFICANCE Treatment of carious root surfaces remains challenging due to the complex pathological processes and difficulty in restoring the highly organised structure of root dentine. Treatment strategies targeting both remineralisation and preservation of the dentinal organic matrix have the potential to improve the fluoride-mediated remineralisation approaches.
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Affiliation(s)
- Jing Cai
- Melbourne Dental School, The University of Melbourne, 720 Swanston Street, Carlton, VIC 3053, Australia
| | - Michael F Burrow
- Melbourne Dental School, The University of Melbourne, 720 Swanston Street, Carlton, VIC 3053, Australia; Faculty of Dentistry, the University of Hong Kong, Prince Philip Dental Hospital, Sai Ying Pun, Hong Kong SAR, China
| | - David J Manton
- Melbourne Dental School, The University of Melbourne, 720 Swanston Street, Carlton, VIC 3053, Australia; Centrum voor Tandheelkunde en Mondzorgkunde, UMCG, University of Groningen, The Netherlands
| | - Rita Hardiman
- Melbourne Dental School, The University of Melbourne, 720 Swanston Street, Carlton, VIC 3053, Australia
| | - Joseph E A Palamara
- Melbourne Dental School, The University of Melbourne, 720 Swanston Street, Carlton, VIC 3053, Australia.
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Beck F, Ilie N. Antioxidants and Collagen-Crosslinking: Benefit on Bond Strength and Clinical Applicability. MATERIALS 2020; 13:ma13235483. [PMID: 33271998 PMCID: PMC7729620 DOI: 10.3390/ma13235483] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Revised: 11/24/2020] [Accepted: 11/29/2020] [Indexed: 11/16/2022]
Abstract
Antioxidants are known for their potential of strengthening the collagen network when applied to dentin. They establish new intra-/intermolecular bonds in the collagen, rendering it less perceptive to enzymatic hydrolysis. The study evaluated the benefit on shear bond strength (SBS) of a resin–composite to dentin when antioxidants with different biomolecular mechanisms or a known inhibitor of enzymatic activity are introduced to the bonding process in a clinically inspired protocol. Specimens (900) were prepared consistent with the requirements for a macro SBS-test. Four agents (Epigallocatechingallate (EGCG), Chlorhexidindigluconate (CHX), Proanthocyanidin (PA), and Hesperidin (HPN)) were applied on dentin, either incorporated in the primer of a two-step self-etch adhesive or as an aqueous solution before applying the adhesive. Bonding protocol executed according to the manufacturer’s information served as control. Groups (n = 20) were tested after one week, one month, three months, six months, or one year immersion times (37 °C, distilled water). After six-month immersion, superior SBS were identified in PA compared to all other agents (p < 0.01) and a higher reliability in both primer and solution application when compared to control. After one year, both PA incorporated test groups demonstrated the most reliable outcome. SBS can benefit from the application of antioxidants. The use of PA in clinics might help extending the lifespan of resin-based restorations.
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Affiliation(s)
| | - Nicoleta Ilie
- Correspondence: ; Tel.: +49-89-44005-9412; Fax: +49-89-44005-930
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Farina AP, Cecchin D, Vidal CMP, Leme-Kraus AA, Bedran-Russo AK. Removal of water binding proteins from dentin increases the adhesion strength of low-hydrophilicity dental resins. Dent Mater 2020; 36:e302-e308. [PMID: 32811665 DOI: 10.1016/j.dental.2020.07.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Revised: 04/05/2020] [Accepted: 07/14/2020] [Indexed: 02/05/2023]
Abstract
OBJECTIVES To investigate the role of proteoglycans (PGs) on the physical properties of the dentin matrix and the bond strength of methacrylate resins with varying hydrophilicities. METHODS Dentin were obtained from crowns of human molars. Enzymatic removal of PGs followed a standard protocol using 1 mg/mL trypsin (Try) for 24 h. Controls were incubated in ammonium bicarbonate buffer. Removal of PGs was assessed by visualization of glycosaminoglycan chains (GAGs) in dentin under transmission electron microscopy (TEM). The dentin matrix swelling ratio was estimated using fully demineralized dentin. Dentin wettability was assessed on wet, dry and re-wetted dentin surfaces through water contact angle measurements. Microtensile bond strength test (TBS) was performed with experimental adhesives containing 6% HEMA (H6) and 18% HEMA (H18) and a commercial dental adhesive. Data were statistically analyzed using ANOVA and post-hoc tests (α = 0.05). RESULTS The enzymatic removal of PGs was confirmed by the absence and fragmentation of GAGs. There was statistically significant difference between the swelling ratio of Try-treated and control dentin (p < 0.001). Significantly lower contact angle was found for Try-treated on wet and dry dentin (p < 0.002). The contact angle on re-wet dentin was not recovered in Try-treated group (p = 0.9). Removal of PGs significantly improved the TBS of H6 (109% higher, p < 0.001) and H18 (29% higher, p = 0.002) when compared to control. The TBS of commercial adhesive was not affected by trypsin treatment (p = 0.9). SIGNIFICANCE Changing the surface energy of dentin by PGs removal improved resin adhesion, likely due to more efficient water displacement, aiding to improved resin infiltration and polymerization.
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Affiliation(s)
- Ana Paula Farina
- Department of Restorative Dentistry, College of Dentistry, University of Illinois at Chicago, 801 South Paulina Street, Room 531, Chicago, IL, USA; Department of Restorative Dentistry, Passo Fundo Dental School, University of Passo Fundo, UPF, Passo Fundo, RS, Brazil
| | - Doglas Cecchin
- Department of Restorative Dentistry, College of Dentistry, University of Illinois at Chicago, 801 South Paulina Street, Room 531, Chicago, IL, USA; Department of Restorative Dentistry, Passo Fundo Dental School, University of Passo Fundo, UPF, Passo Fundo, RS, Brazil
| | - Cristina M P Vidal
- Department of Restorative Dentistry, College of Dentistry, University of Illinois at Chicago, 801 South Paulina Street, Room 531, Chicago, IL, USA
| | - Ariene Arcas Leme-Kraus
- Department of Restorative Dentistry, College of Dentistry, University of Illinois at Chicago, 801 South Paulina Street, Room 531, Chicago, IL, USA
| | - Ana K Bedran-Russo
- Department of Restorative Dentistry, College of Dentistry, University of Illinois at Chicago, 801 South Paulina Street, Room 531, Chicago, IL, USA.
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The application of mussel-inspired molecule in dentin bonding. J Dent 2020; 99:103404. [DOI: 10.1016/j.jdent.2020.103404] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 05/21/2020] [Accepted: 06/03/2020] [Indexed: 11/21/2022] Open
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Dávila-Sánchez A, Gutierrez MF, Bermudez JP, Méndez-Bauer ML, Hilgemberg B, Sauro S, Loguercio AD, Arrais CAG. Influence of flavonoids on long-term bonding stability on caries-affected dentin. Dent Mater 2020; 36:1151-1160. [PMID: 32620332 DOI: 10.1016/j.dental.2020.05.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Revised: 03/27/2020] [Accepted: 05/13/2020] [Indexed: 12/20/2022]
Abstract
OBJECTIVES To evaluate the effect of experimental dentin pre-treatment solutions formulated with different flavonoids on microtensile bond strength (μTBS), nanohardness (NH) and ultra-morphological characteristics of artificial caries-affected dentin (CAD) bonded using a universal bonding system. METHODS A microbiological method was used to create an artificial CAD in 91 human molars. Five experimental pre-treatment solutions were created using the following flavonoids: quercetin (QUE); hesperidin (HES); rutin (RUT); naringin (NAR), or proanthocyanidin (PRO). A placebo solution (PLA) with no flavonoids added was also evaluated. The flavonoids or placebo solutions were applied to the CAD prior to the application and photoactivation of a universal adhesive (Scotchbond Universal, 3M Oral Care). A control group (CON), in which only the bonding agent was applied without any flavonoid solution, was also evaluated. A 3-mm-thick block of resin composite (Opallis, FGM) was built up on the flat bonded CAD surfaces and was light-cured following the manufacturer's instructions. Specimens were sectioned to obtain resin-dentin slices and sticks (cross-sectional area of 0.8 mm2). The μTBS, NH, and confocal ultramorphology analysis of resin-dentin interface was evaluated at 24 h and after thermo-cycling aging (25,000 cycles). The results were analyzed using 2-way ANOVA followed by Bonferroni's post hoc test (pre-set α = 0.05). RESULTS The specimens from groups QUE, NAR, and RUT presented greater μTBS values than those from CON group (p<0.05). Specimens from some of these experimental groups presented greater nanomechanical properties (p<0.05), and no morphological degradation at the resin-dentin interface after aging. SIGNIFICANCE The use of exogenous cross-linkers as dentin pre-treatment before bonding procedures may represent a suitable strategy to improve the longevity of universal adhesive systems applied to caries-affected dentin.
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Affiliation(s)
- Andrés Dávila-Sánchez
- Department of Restorative Dentistry, San Francisco de Quito University (USFQ), Pampite y Diego de Robles Zip Code 170901, Quito, EC-P, Ecuador
| | - Mario Felipe Gutierrez
- Department of Biomaterials, School of Dentistry, Universidad de los Andes, Monseñor Alvaro del Portillo 12455, Santiago, Postal code 7550000, Chile; Institute for Research in Dental Sciences, Faculty of Dentistry, University of Chile, Av. Olivos 943, Independencia, Santiago, Postal code 8380544, Chile
| | - Jorge Pailover Bermudez
- Department of Restorative Dentistry, State University of Ponta Grossa, Rua General Carlos Cavalcanti, 4748, Uvaranas, Ponta Grossa, Parana, 84030-900 Brazil
| | - María Luján Méndez-Bauer
- Department of Restorative Dentistry, State University of Ponta Grossa, Rua General Carlos Cavalcanti, 4748, Uvaranas, Ponta Grossa, Parana, 84030-900 Brazil; Research Department, School of Dentistry, University Francisco Marroquín (UFM), 6th street 7-11 zone 10, Postal code: 01010, Guatemala
| | - Bruna Hilgemberg
- Department of Restorative Dentistry, State University of Ponta Grossa, Rua General Carlos Cavalcanti, 4748, Uvaranas, Ponta Grossa, Parana, 84030-900 Brazil
| | - Salvatore Sauro
- Dental Biomaterials, Dental Biomaterials and Minimally Invasive Dentistry, Departmento de Odontologia, Facultad de Ciencias de la Salud Universidad, CEU-Cardenal Herrera, Alfara del Patriarca (Valencia), 46115 Spain
| | - Alessandro D Loguercio
- Department of Restorative Dentistry, State University of Ponta Grossa, Rua General Carlos Cavalcanti, 4748, Uvaranas, Ponta Grossa, Parana, 84030-900 Brazil
| | - Cesar Augusto Galvão Arrais
- Department of Restorative Dentistry, State University of Ponta Grossa, Rua General Carlos Cavalcanti, 4748, Uvaranas, Ponta Grossa, Parana, 84030-900 Brazil.
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