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Porto ICCDM, Lôbo TDLGF, Rodrigues RF, Lins RBE, da Silva MAB. Insight into the development of versatile dentin bonding agents to increase the durability of the bonding interface. FRONTIERS IN DENTAL MEDICINE 2023. [DOI: 10.3389/fdmed.2023.1127368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023] Open
Abstract
Despite the huge improvements made in adhesive technology over the past 50 years, there are still some unresolved issues regarding the durability of the adhesive interface. A complete sealing of the interface between the resin and the dentin substrate remains difficult to achieve, and it is doubtful whether an optimal interdiffusion of the adhesive system within the demineralized collagen framework can be produced in a complete and homogeneous way. In fact, it is suggested that hydrolytic degradation, combined with the action of dentin matrix enzymes, destabilizes the tooth-adhesive bond and disrupts the unprotected collagen fibrils. While a sufficient resin–dentin adhesion is usually achieved immediately, bonding efficiency declines over time. Thus, here, a review will be carried out through a bibliographic survey of scientific articles published in the last few years to present strategies that have been proposed to improve and/or develop new adhesive systems that can help prevent degradation at the adhesive interface. It will specially focus on new clinical techniques or new materials with characteristics that contribute to increasing the durability of adhesive restorations and avoiding the recurrent replacement restorative cycle and the consequent increase in damage to the tooth.
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de Moraes IQS, do Nascimento TG, da Silva AT, de Lira LMSS, Parolia A, Porto ICCDM. Inhibition of matrix metalloproteinases: a troubleshooting for dentin adhesion. Restor Dent Endod 2020; 45:e31. [PMID: 32839712 PMCID: PMC7431940 DOI: 10.5395/rde.2020.45.e31] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2019] [Revised: 02/17/2020] [Accepted: 03/05/2020] [Indexed: 02/07/2023] Open
Abstract
Matrix metalloproteinases (MMPs) are enzymes that can degrade collagen in hybrid layer and reduce the longevity of adhesive restorations. As scientific understanding of the MMPs has advanced, useful strategies focusing on preventing these enzymes' actions by MMP inhibitors have quickly developed in many medical fields. However, in restorative dentistry, it is still not well established. This paper is an overview of the strategies to inhibit MMPs that can achieve a long-lasting material-tooth adhesion. Literature search was performed comprehensively using the electronic databases: PubMed, ScienceDirect and Scopus including articles from May 2007 to December 2019 and the main search terms were “matrix metalloproteinases”, “collagen”, and “dentin” and “hybrid layer”. MMPs typical structure consists of several distinct domains. MMP inhibitors can be divided into 2 main groups: synthetic (synthetic-peptides, non-peptide molecules and compounds, tetracyclines, metallic ions, and others) and natural bioactive inhibitors mainly flavonoids. Selective inhibitors of MMPs promise to be the future for specific targeting of preventing dentin proteolysis. The knowledge about MMPs functionality should be considered to synthesize drugs capable to efficiently and selectively block MMPs chemical routes targeting their inactivation in order to overcome the current limitations of the therapeutic use of MMPs inhibitors, i.e., easy clinical application and long-lasting effect.
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Affiliation(s)
- Izadora Quintela Souza de Moraes
- Laboratory of Pharmaceutical and Food Analysis, Institute of Pharmaceutical Sciences, Federal University of Alagoas, Campus A. C. Simões, Maceió, Alagoas, Brazil
| | - Ticiano Gomes do Nascimento
- Laboratory of Pharmaceutical and Food Analysis, Institute of Pharmaceutical Sciences, Federal University of Alagoas, Campus A. C. Simões, Maceió, Alagoas, Brazil
| | - Antonio Thomás da Silva
- Laboratory of Pharmaceutical and Food Analysis, Institute of Pharmaceutical Sciences, Federal University of Alagoas, Campus A. C. Simões, Maceió, Alagoas, Brazil
| | - Lilian Maria Santos Silva de Lira
- Laboratory of Pharmaceutical and Food Analysis, Institute of Pharmaceutical Sciences, Federal University of Alagoas, Campus A. C. Simões, Maceió, Alagoas, Brazil
| | - Abhishek Parolia
- Division of Clinical Dentistry, School of Dentistry, International Medical University, Kuala Lumpur, Malaysia
| | - Isabel Cristina Celerino de Moraes Porto
- Laboratory of Pharmaceutical and Food Analysis, Institute of Pharmaceutical Sciences, Federal University of Alagoas, Campus A. C. Simões, Maceió, Alagoas, Brazil.,Department of Restorative Dentistry, Faculty of Dentistry, Federal University of Alagoas, Campus A. C. Simões, Maceió, Alagoas, Brazil
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Stape THS, Tjäderhane L, Tezvergil-Mutluay A, Da Silva WG, Dos Santos Silva AR, da Silva WJ, Marques MR. In situ analysis of gelatinolytic activity in human dentin. Acta Histochem 2018; 120:136-141. [PMID: 29373132 DOI: 10.1016/j.acthis.2017.12.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Revised: 11/27/2017] [Accepted: 12/29/2017] [Indexed: 11/29/2022]
Abstract
Matrix metalloproteinases (MMPs) such as gelatinases are differentially expressed in human tissues. These enzymes cleave specific substrates involved in cell signaling, tissue development and remodeling and tissue breakdown. Recent evidences show that gelatinases are crucial for normal dentin development and their activity is maintained throughout the entire tooth function in the oral cavity. Due to the lack of information about the exact location and activity of gelatinases in mature human dentin, the present study was designed to examine gelatinolytic levels in sound dentin. In situ zymography using confocal microscopy was performed on both mineralized and demineralized dentin samples. Sites presenting gelatinase activity were identified throughout the entire biological tissue pursuing different gelatinolytic levels for distinct areas: predentin and dentinal tubule regions presented higher gelatinolytic activity compared to intertubular dentin. Dentin regions with higher gelatinolytic activity immunohistochemically were partially correlated with MMP-2 expression. The maintenance of gelatinolytic activity in mature dentin may have biological implications related to biomineralization of predentin and tubular/peritubular dentinal regions, as well as regulation of defensive mechanisms of the dentin-pulp complex.
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Affiliation(s)
- Thiago Henrique Scarabello Stape
- Adhesive Dentistry Research Group, Institute of Dentistry, University of Turku, Turku, Finland; Department of Restorative Dentistry and Cariology, University of Turku, Turku, Finland
| | - Leo Tjäderhane
- Department of Oral and Maxillofacial Diseases, University of Helsinki, Helsinki, Finland and Helsinki University Hospital, Helsinki, Finland; Research Unit of Oral Health Sciences, and Medical Research Center Oulu (MRC Oulu), Oulu University Hospital and University of Oulu, Oulu, Finland
| | - Arzu Tezvergil-Mutluay
- Adhesive Dentistry Research Group, Institute of Dentistry, University of Turku, Turku, Finland; Department of Restorative Dentistry and Cariology, University of Turku, Turku, Finland
| | - Wagner Gomes Da Silva
- Department of Oral Diagnosis, Semiology Area, Piracicaba Dental School, State University of Campinas, Piracicaba, SP, Brazil
| | - Alan Roger Dos Santos Silva
- Department of Oral Diagnosis, Semiology Area, Piracicaba Dental School, State University of Campinas, Piracicaba, SP, Brazil
| | - Wander José da Silva
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, State University of Campinas, Piracicaba, SP, Brazil
| | - Marcelo Rocha Marques
- Department of Morphology Division of Histology, Piracicaba Dental School, State University of Campinas, Piracicaba, SP, Brazil.
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Scaffa PMC, Breschi L, Mazzoni A, Vidal CDMP, Curci R, Apolonio F, Gobbi P, Pashley D, Tjäderhane L, Tersariol ILDS, Nascimento FD, Carrilho MR. Co-distribution of cysteine cathepsins and matrix metalloproteases in human dentin. Arch Oral Biol 2016; 74:101-107. [PMID: 27923176 DOI: 10.1016/j.archoralbio.2016.11.011] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Revised: 10/26/2016] [Accepted: 11/20/2016] [Indexed: 11/19/2022]
Abstract
It has been hypothesized that cysteine cathepsins (CTs) along with matrix metalloproteases (MMPs) may work in conjunction in the proteolysis of mature dentin matrix. The aim of this study was to verify simultaneously the distribution and presence of cathepsins B (CT-B) and K (CT-K) in partially demineralized dentin; and further to evaluate the activity of CTs and MMPs in the same tissue. The distribution of CT-B and CT-K in sound human dentin was assessed by immunohistochemistry. A double-immunolabeling technique was used to identify, at once, the occurrence of those enzymes in dentin. Activities of CTs and MMPs in dentin extracts were evaluated spectrofluorometrically. In addition, in situ gelatinolytic activity of dentin was assayed by zymography. The results revealed the distribution of CT-B and CT-K along the dentin organic matrix and also indicated co-occurrence of MMPs and CTs in that tissue. The enzyme kinetics studies showed proteolytic activity in dentin extracts for both classes of proteases. Furthermore, it was observed that, at least for sound human dentin matrices, the activity of MMPs seems to be predominant over the CTs one.
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Affiliation(s)
- Polliana Mendes Candia Scaffa
- Faculty of Dentistry at Piracicaba, University of Campinas, Piracicaba, 13414-903, Brazil; Department of Biological Science, Bauru School of Dentistry, University of Sao Paulo, Bauru, SP, 17012-901, Brazil
| | - Lorenzo Breschi
- Department of Biomedical and Neuromotor Sciences, University of Bologna, Bologna, 40126, Italy
| | - Annalisa Mazzoni
- Department of Medical Sciences, University of Trieste, Trieste, 34128, Italy
| | - Cristina de Mattos Pimenta Vidal
- Faculty of Dentistry at Piracicaba, University of Campinas, Piracicaba, 13414-903, Brazil; Department of Operative Dentistry, College of Dentistry, University of Iowa, 801 Newton Rd, Iowa City, IA,52246, USA
| | - Rosa Curci
- IGM-CNR, Unit of Bologna c/o IOR, Bologna, 40136, Italy
| | - Fabianni Apolonio
- Department of Pharmacy, Dentistry and Nursing, Federal University of Ceara, Fortaleza, 60020-181, Brazil
| | - Pietro Gobbi
- Department of SteVA, University "Carlo Bo", Urbino, 61029, Italy
| | - David Pashley
- Emeritus Professor of Oral Biology, Dental College of Georgia, Georgia Health Sciences University, Augusta, Georgia, 30912, USA
| | - Leo Tjäderhane
- Institute of Dentistry, University of Oulu, and Medical Research Center Oulu, Oulu University Hospital and University of Oulu, Oulu FI-90014, Finland; Department of Oral and Maxillofacial Diseases, University of Helsinki, and Helsinki University Hospital, Helsinki FI-00014, Finland
| | - Ivarne Luis Dos Santos Tersariol
- Department of Biochemistry, Federal University of São Paulo, São Paulo, 04021-001, Brazil; Centro Interdisciplinar de Investigação Bioquímica, University of Mogi das Cruzes, Mogi das Cruzes, 08773-520, Brazil
| | - Fábio Dupart Nascimento
- Centro Interdisciplinar de Investigação Bioquímica, University of Mogi das Cruzes, Mogi das Cruzes, 08773-520, Brazil
| | - Marcela Rocha Carrilho
- Biomaterials in Dentistry Program, Anhanguera University São Paulo (UNIAN-SP), São Paulo, 05145-200, Brazil; Biotechnology and Innovation in Health Program, Anhanguera University São Paulo (UNIAN-SP), São Paulo, 05145-200, Brazil.
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Silva Sousa AB, Vidal CMP, Leme-Kraus AA, Pires-de-Souza FCP, Bedran-Russo AK. Experimental primers containing synthetic and natural compounds reduce enzymatic activity at the dentin-adhesive interface under cyclic loading. Dent Mater 2016; 32:1248-1255. [PMID: 27524231 DOI: 10.1016/j.dental.2016.07.012] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Revised: 07/18/2016] [Accepted: 07/19/2016] [Indexed: 01/31/2023]
Abstract
OBJECTIVE To evaluate the effect of experimental primers (chlorhexidine, enriched mixture of proanthocyanidins, and doxycycline) on the adhesive properties and gelatinolytic activity at dentin-resin interfaces of occlusal Class I restorations. METHODS The inactivation of enzymes by the experimental primers was assessed by fluorescence assay and gelatin zymography. To assess the adhesive properties, occlusal Class I cavities were prepared in sound human molars, etched with phosphoric acid and restored with one of the primers and an etch-and-rinse adhesive system (Adper Single Bond Plus-3M ESPE). After the restorative procedures, specimens were divided into two subgroups (n=6) consisting of storage in incubation buffer or axial cyclic loading at 50N and 1,000,000 cycles. Then, the specimens were sectioned and slices were assigned to in situ zymography assay and microtensile bond strength (TBS) test. RESULTS Fluorescence assay and gelatin zymography revealed that the experimental primers inactivated rMMPs. In situ zymography (2-way ANOVA, Tukey, p<0.05) showed that cyclic loading increased the gelatinolytic activity at the resin-dentin interface and the experimental primers decreased the gelatinolytic activity at the adhesive interface. The experimental primers had no significant effects on dentin-adhesive bond strengths with or without cyclic loading (2-way ANOVA, p>0.05). SIGNIFICANCE The use of experimental primers impaired the enzymatic activity at the dentin-adhesive interface after cyclic loading and the activity of rMMPs. Cyclic loading did not have a significant effect on the bond strength.
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Affiliation(s)
- Ana Beatriz Silva Sousa
- Department of Restorative Dentistry, College of Dentistry, University of Illinois at Chicago, IL, USA; Department of Dental Materials and Prosthodontics, Ribeirão Preto Dental School, University of São Paulo, SP, Brazil
| | - Cristina M P Vidal
- Department of Restorative Dentistry, College of Dentistry, University of Illinois at Chicago, IL, USA
| | - Ariene Arcas Leme-Kraus
- Department of Restorative Dentistry, College of Dentistry, University of Illinois at Chicago, IL, USA
| | - Fernanda C P Pires-de-Souza
- Department of Dental Materials and Prosthodontics, Ribeirão Preto Dental School, University of São Paulo, SP, Brazil
| | - Ana K Bedran-Russo
- Department of Restorative Dentistry, College of Dentistry, University of Illinois at Chicago, IL, USA.
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Takahashi N, Nyvad B. Ecological Hypothesis of Dentin and Root Caries. Caries Res 2016; 50:422-31. [PMID: 27458979 DOI: 10.1159/000447309] [Citation(s) in RCA: 148] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Accepted: 05/31/2016] [Indexed: 11/19/2022] Open
Abstract
Recent advances regarding the caries process indicate that ecological phenomena induced by bacterial acid production tilt the de- and remineralization balance of the dental hard tissues towards demineralization through bacterial acid-induced adaptation and selection within the microbiota - from the dynamic stability stage to the aciduric stage via the acidogenic stage [Takahashi and Nyvad, 2008]. Dentin and root caries can also be partly explained by this hypothesis; however, the fact that these tissues contain a considerable amount of organic material suggests that protein degradation is involved in caries formation. In this review, we compiled relevant histological, biochemical, and microbiological information about dentin/root caries and refined the hypothesis by adding degradation of the organic matrix (the proteolytic stage) to the abovementioned stages. Bacterial acidification not only induces demineralization and exposure of the organic matrix in dentin/root surfaces but also activation of dentin-embedded and salivary matrix metalloproteinases and cathepsins. These phenomena initiate degradation of the demineralized organic matrix in dentin/root surfaces. While a bacterial involvement has never been confirmed in the initial degradation of organic material, the detection of proteolytic/amino acid-degrading bacteria and bacterial metabolites in dentin and root caries suggests a bacterial digestion and metabolism of partly degraded matrix. Moreover, bacterial metabolites might induce pulpitis as an inflammatory/immunomodulatory factor. Root and dentin surfaces are always at risk of becoming demineralized in the oral cavity, and exposed organic materials can be degraded by host-derived proteases contained in saliva and dentin itself. New approaches to the prevention and treatment of root/dentin caries are required.
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Affiliation(s)
- Nobuhiro Takahashi
- Division of Oral Ecology and Biochemistry, Tohoku University Graduate School of Dentistry, Sendai, Japan
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Li X, Liang W, Ye H, Weng X, Liu F, Lin P, Liu X. Overexpression of Indian hedgehog partially rescues short stature homeobox 2-overexpression-associated congenital dysplasia of the temporomandibular joint in mice. Mol Med Rep 2015; 12:4157-4164. [PMID: 26096903 PMCID: PMC4526079 DOI: 10.3892/mmr.2015.3959] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2015] [Accepted: 05/15/2015] [Indexed: 01/22/2023] Open
Abstract
The role of short stature homeobox 2 (shox2) in the development and homeostasis of the temporomandibular joint (TMJ) has been well documented. Shox2 is known to be expressed in the progenitor cells and perichondrium of the developing condyle. A previous study by our group reported that overexpression of shox2 leads to congenital dysplasia of the TMJ via downregulation of the Indian hedgehog (Ihh) signaling pathway, which is essential for embryonic disc primordium formation and mandibular condylar growth. To determine whether overexpression of Ihh may rescue the overexpression of shox2 leading to congenital dysplasia of the TMJ, a mouse model in which Ihh and shox2 were overexpressed (Wnt1-Cre; pMes-stop shox2; pMes-stop Ihh mice) was utilized to assess the consequences of this overexpression on TMJ development during post-natal life. The results showed that the developmental process and expression levels of runt-related transcription factor 2 and sex determining region Y-box 9 in the TMJ of the Wnt1-Cre; pMes-stop shox2; pMes-stop Ihh mice were similar to those in wild-type mice. Overexpression of Ihh rescued shox2 overexpression-associated reduction of extracellular matrix components. However, overexpression of Ihh did not inhibit the shox2 overexpression-associated increase of matrix metalloproteinases (MMPs) MMP9, MMP13 and apoptosis in the TMJ. These combinatory cellular and molecular defects appeared to account for the observed congenital dysplasia of TMJ, suggesting that overexpression of Ihh partially rescued shox2 overexpression-associated congenital dysplasia of the TMJ in mice.
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Affiliation(s)
- Xihai Li
- Institute of Bone Diseases, Academy of Integrative Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian 350122, P.R. China
| | - Wenna Liang
- Research Base of Traditional Chinese Medicine Syndrome, College of Traditional Chinese Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian 350122, P.R. China
| | - Hongzhi Ye
- Institute of Bone Diseases, Academy of Integrative Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian 350122, P.R. China
| | - Xiaping Weng
- Fujian Key Laboratory of Integrative Medicine on Geriatrics, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian 350122, P.R. China
| | - Fayuan Liu
- Institute of Bone Diseases, Academy of Integrative Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian 350122, P.R. China
| | - Pingdong Lin
- Fujian Key Laboratory of Integrative Medicine on Geriatrics, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian 350122, P.R. China
| | - Xianxiang Liu
- Institute of Bone Diseases, Academy of Integrative Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian 350122, P.R. China
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Tjäderhane L, Buzalaf MAR, Carrilho M, Chaussain C. Matrix metalloproteinases and other matrix proteinases in relation to cariology: the era of 'dentin degradomics'. Caries Res 2015; 49:193-208. [PMID: 25661522 DOI: 10.1159/000363582] [Citation(s) in RCA: 81] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2014] [Accepted: 05/07/2014] [Indexed: 11/19/2022] Open
Abstract
Dentin organic matrix, with type I collagen as the main component, is exposed after demineralization in dentinal caries, erosion or acidic conditioning during adhesive composite restorative treatment. This exposed matrix is prone to slow hydrolytic degradation by host collagenolytic enzymes, matrix metalloproteinases (MMPs) and cysteine cathepsins. Here we review the recent findings demonstrating that inhibition of salivary or dentin endogenous collagenolytic enzymes may provide preventive means against progression of caries or erosion, just as they have been shown to retain the integrity and improve the longevity of resin composite filling bonding to dentin. This paper also presents the case that the organic matrix in caries-affected dentin may not be preserved as intact as previously considered. In partially demineralized dentin, MMPs and cysteine cathepsins with the ability to cleave off the terminal non-helical ends of collagen molecules (telopeptides) may lead to the gradual loss of intramolecular gap areas. This would seriously compromise the matrix ability for intrafibrillar remineralization, which is considered essential in restoring the dentin's mechanical properties. More detailed data of the enzymes responsible and their detailed function in dentin-destructive conditions may not only help to find new and better preventive means, but better preservation of demineralized dentin collagenous matrix may also facilitate true biological remineralization for the better restoration of tooth structural and mechanical integrity and mechanical properties.
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Affiliation(s)
- Leo Tjäderhane
- Institute of Dentistry, University of Oulu, Oulu, Finland
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Abstract
In dentin bonding, contemporary dental adhesive systems rely on formation of the hybrid layer, a biocomposite containing dentin collagen and polymerized resin adhesive. They are usually able to create at least reasonable integrity of the hybrid layer with high immediate bond strength. However, loss of dentin-bonded interface integrity and bond strength is commonly seen after aging both in vitro and in vivo. This is due to endogenous collagenolytic enzymes, matrix metalloproteinases, and cysteine cathepsins, responsible for the time-dependent loss of hybrid layer collagen. In addition, the hydrophilic nature of adhesive systems creates problems that lead to suboptimal hybrid layers. These problems include, for example, insufficient resin impregnation of dentin, phase separation, and a low rate of polymerization, all of which may reduce the longevity of the bonded interface. Preservation of the collagen matrix integrity by inhibition of endogenous dentin proteases is key to improving dentin bonding durability. Several approaches to retain the integrity of the hybrid layer and to improve the long-term dentin bond strength have been tested. These include the use of enzyme inhibitors, either separately or as incorporated into the adhesive resins; increase of collagen resistance to enzymatic degradation; and elimination of water from the interface to slow down or eliminate hydrolytic loss of the hybrid layer components. This review looks at the principles, current status, and future of the different techniques designed to prevent the loss of hybrid layer and bond strength.
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Li X, Liu H, Gu S, Liu C, Sun C, Zheng Y, Chen Y. Replacing Shox2 with human SHOX leads to congenital disc degeneration of the temporomandibular joint in mice. Cell Tissue Res 2014; 355:345-54. [PMID: 24248941 PMCID: PMC3945842 DOI: 10.1007/s00441-013-1743-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2013] [Accepted: 10/10/2013] [Indexed: 12/11/2022]
Abstract
The temporomandibular joint (TMJ) consists in the glenoid fossa arising from the otic capsule through intramembranous ossification, the fibrocartilaginous disc and the condyle, which is derived from the secondary cartilage by endochondral ossification. We have reported previously that cranial neural-crest-specific inactivation of the homeobox gene Shox2, which is expressed in the mesenchymal cells of the maxilla-mandibular junction and later in the progenitor cells and perichondrium of the developing chondyle, leads to dysplasia and ankylosis of the TMJ and that replacement of the mouse Shox2 with the human SHOX gene rescues the dysplastic and ankylosis phenotypes but results in a prematurely worn out articular disc. In this study, we investigate the molecular and cellular bases for the prematurely worn out articular disc in the TMJ of mice carrying the human SHOX replacement allele in the Shox2 locus (termed Shox2 (SHOX-KI/KI)). We find that the developmental process and expression of several key genes in the TMJ of Shox2 (SHOX-KI/KI) mice are similar to that of controls. However, the disc of the Shox2 (SHOX-KI/KI) TMJ exhibits a reduced level of Collagen I and Aggrecan, accompanied by increased activities of matrix metalloproteinases and a down-regulation of Ihh expression. Dramatically increased cell apoptosis in the disc was also observed. These combinatory cellular and molecular defects appear to contribute to the observed disc phenotype, suggesting that, although human SHOX can exert similar functions to mouse Shox2 in regulating early TMJ development, it apparently has a distinct function in the regulation of those molecules that are involved in tissue homeostasis.
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Affiliation(s)
- Xihai Li
- Academy of Integrative Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian 350122, P.R. China
- Department of Cell and Molecular Biology, Tulane University, New Orleans, LA 70118, USA
| | - Hongbing Liu
- Department of Cell and Molecular Biology, Tulane University, New Orleans, LA 70118, USA
| | - Shuping Gu
- Department of Cell and Molecular Biology, Tulane University, New Orleans, LA 70118, USA
| | - Chao Liu
- Department of Cell and Molecular Biology, Tulane University, New Orleans, LA 70118, USA
| | - Cheng Sun
- Department of Cell and Molecular Biology, Tulane University, New Orleans, LA 70118, USA
| | - Yuqian Zheng
- Department of Cell and Molecular Biology, Tulane University, New Orleans, LA 70118, USA
| | - YiPing Chen
- Department of Cell and Molecular Biology, Tulane University, New Orleans, LA 70118, USA
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11
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Tjäderhane L, Buzalaf MA, Salo T. The origin of matrix metalloproteinases in attrited dentine. Arch Oral Biol 2013; 59:233-5. [PMID: 24370196 DOI: 10.1016/j.archoralbio.2013.11.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2013] [Accepted: 11/21/2013] [Indexed: 11/28/2022]
Affiliation(s)
- Leo Tjäderhane
- Institute of Dentistry, University of Oulu, Oulu University Hospital, Oulu, Finland; Institute of Dentistry, University of Turku, Turku, Finland; Nordic Institute of Dental Materials (NIOM), Oslo, Norway.
| | - Marília A Buzalaf
- Discipline of Biochemistry, Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil
| | - Tuula Salo
- Institute of Dentistry, University of Oulu, Oulu University Hospital, Oulu, Finland; Institute of Dentistry, University of Helsinki, Helsinki, Finland
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12
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Chaussain C, Boukpessi T, Khaddam M, Tjaderhane L, George A, Menashi S. Dentin matrix degradation by host matrix metalloproteinases: inhibition and clinical perspectives toward regeneration. Front Physiol 2013; 4:308. [PMID: 24198787 PMCID: PMC3814849 DOI: 10.3389/fphys.2013.00308] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2013] [Accepted: 10/08/2013] [Indexed: 01/13/2023] Open
Abstract
Bacterial enzymes have long been considered solely accountable for the degradation of the dentin matrix during the carious process. However, the emerging literature suggests that host-derived enzymes, and in particular the matrix metalloproteinases (MMPs) contained in dentin and saliva can play a major role in this process by their ability to degrade the dentin matrix from within. These findings are important since they open new therapeutic options for caries prevention and treatment. The possibility of using MMP inhibitors to interfere with dentin caries progression is discussed. Furthermore, the potential release of bioactive peptides by the enzymatic cleavage of dentin matrix proteins by MMPs during the carious process is discussed. These peptides, once identified, may constitute promising therapeutical tools for tooth and bone regeneration.
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Affiliation(s)
- Catherine Chaussain
- EA 2496 Dental School University Paris Descartes Montrouge, France ; Odontology Departments (Bretonneau and Charles Foix), AP-HP Paris, France
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