1
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Lehmann A, Nijakowski K, Jankowski J, Donnermeyer D, Ramos JC, Drobac M, Martins JFB, Hatipoğlu Ö, Omarova B, Javed MQ, Alharkan HM, Bekjanova O, Wyzga S, Alkhawas MBAM, Kudenga R, Surdacka A. Clinical Difficulties Related to Direct Composite Restorations: A Multinational Survey. Int Dent J 2024:S0020-6539(24)00164-3. [PMID: 39048490 DOI: 10.1016/j.identj.2024.06.012] [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: 03/26/2024] [Revised: 06/14/2024] [Accepted: 06/18/2024] [Indexed: 07/27/2024] Open
Abstract
AIMS Composite materials are widely used in dentistry for direct tooth restorations. However, they are highly sensitive to the working technique employed during the restorative procedure. Even minor procedural errors can have a significant impact on the quality including the longevity of the restoration. Hence the aim of this study was to determine the material preferences and analyse the clinical problems associated with direct composite restorations in a cohort of dentists. METHODS A 20-item online questionnaire was created in English and administered 1830 general dentists and specialists in 13 countries. The first section of the questionnaire included four questions to elicit demographic data, and the second section comprised 16 questions focused on material preferences for conservative restorations, durability of composite restorations, and the most challenging stages the dentists faced during the composite restorative procedures. RESULTS Respondents decided most often to use composite materials for the tooth restorations (OR 997.4, 95% CI 233.8-4254.8, P value <.001). Most respondents indicated that the durability of composite restorations was approximately 7 to 10 years (41.5%). Among the factors affecting durability, maintenance of a dry cavity was the most often reported reason (47.1%) and the foremost challenge faced by dentists (61.0%) during the composite restorative procedures. CONCLUSIONS Our study confirmed that resin-based composites are the most popular material for direct restoration in many countries. Although working with this material is difficult and involves multiple steps, maintaining a dry cavity during bonding, and material application may affect the therapeutic success and durability of these restorations. Clinicians need to be attentive to this issue and be prepared to adapt their decision-making and consider opting for alternative restorative materials, if appropriate.
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Affiliation(s)
- Anna Lehmann
- Department of Conservative Dentistry and Endodontics, Poznan University of Medical Sciences, Poznan, Poland
| | - Kacper Nijakowski
- Department of Conservative Dentistry and Endodontics, Poznan University of Medical Sciences, Poznan, Poland.
| | - Jakub Jankowski
- Department of Conservative Dentistry and Endodontics, Poznan University of Medical Sciences, Poznan, Poland
| | - David Donnermeyer
- Department of Periodontology and Operative Dentistry, University Münster, Münster, Germany
| | - João Carlos Ramos
- Center for Innovation and Research in Oral Sciences (CIROS) and Institute of Operative Dentistry, Faculty of Medicine, University of Coimbra, Coimbra, Portugal
| | - Milan Drobac
- Department of Dental Medicine, Faculty of Medicine, University of Novi Sad, Novi Sad, Serbia
| | - João Filipe Brochado Martins
- Departments of Endodontology Academic Centre for Dentistry Amsterdam, University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Ömer Hatipoğlu
- Department of Restorative Dentistry, Niğde Ömer Halisdemir University, Niğde, Turkiye
| | - Bakhyt Omarova
- Department of Therapeutic Dentistry, Kazakh National Medical University by S.D. Asfendiyarov, Almaty, Kazakhstan
| | - Muhammad Qasim Javed
- Department of Conservative Dental Sciences, College of Dentistry, Qassim University, Buraydah, Qassim, Saudi Arabia
| | - Hamad Mohammad Alharkan
- Department of Conservative Dental Sciences, College of Dentistry, Qassim University, Buraydah, Qassim, Saudi Arabia
| | - Olga Bekjanova
- Department of Faculty Therapeutic Dentistry, Tashkent State Dental Institute, Tashkent, Uzbekistan
| | - Sylvia Wyzga
- Department of Conservative Dentistry and Endodontics, Poznan University of Medical Sciences, Poznan, Poland
| | | | - Rutendo Kudenga
- Department of Odontology, University of Pretoria, Riviera, Pretoria, Republic of South Africa
| | - Anna Surdacka
- Department of Conservative Dentistry and Endodontics, Poznan University of Medical Sciences, Poznan, Poland
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Lehmann A, Nijakowski K, Jankowski J, Donnermeyer D, Palma PJ, Drobac M, Martins JFB, Pertek Hatipoğlu F, Tulegenova I, Javed MQ, Alharkan HM, Bekjanova O, Wyzga S, Alkhawas MBAM, Kudenga R, Hatipoğlu Ö, Surdacka A. Awareness of possible complications associated with direct composite restorations: A multinational survey among dentists from 13 countries with meta-analysis. J Dent 2024; 145:105009. [PMID: 38643866 DOI: 10.1016/j.jdent.2024.105009] [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: 03/10/2024] [Revised: 04/01/2024] [Accepted: 04/18/2024] [Indexed: 04/23/2024] Open
Abstract
OBJECTIVES Resin-based composites (RBCs) evolved into favoured materials for teeth restorations, marking a significant change in dental practice. Despite many advantages, RBCs exhibit various limitations in their physical and chemical properties. Therefore, we assessed the dentists' awareness of possible complications after direct composite restorations and their opinions about this material. METHODS The online questionnaire was created in English in May 2023. A 16-item survey was dedicated to general dentists and specialists. The first section included four questions related to demographic characteristics. The second section comprised twelve questions and focused on awareness of potential side effects of composite restorations, the most crucial advantages and disadvantages of composite resins, and the frequency of experienced clinical complications after the application of composite materials. RESULTS A total of 1830 dentists from 13 countries took part in the survey. Dentists most often declared awareness of low adhesion to the dentine (77.5 %) and, most rarely, solubility in oral fluids (42.6 %). Aesthetics was identified as the main advantage of composite fillings (79 %), followed by the possibility of repair (59 %) and adhesion to enamel (57 %). Polymerisation shrinkage was a major disadvantage for most countries (70 % overall). Analysing the declared potential clinical complications for all countries, statistically significant findings were obtained for marginal discolouration (OR=2.982, 95 % CI: 1.321-6.730, p-value=0.009) and borderline significance for secondary caries (OR=1.814, 95 % CI: 0.964-3.415, p-value=0.065). CONCLUSIONS Dentists value aesthetics and repairability but are aware of shrinkage and experience discolouration. The issue of toxicity and solubility seems to be the least known to dentists. CLINICAL SIGNIFICANCE Dentists should use RBCs with critical caution due to possible side effects. Despite the undoubted aesthetics of direct composite restorations, it is necessary to remember potential clinical complications such as marginal discolouration or secondary caries.
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Affiliation(s)
- Anna Lehmann
- Department of Conservative Dentistry and Endodontics, Poznan University of Medical Sciences, Poznan, Poland
| | - Kacper Nijakowski
- Department of Conservative Dentistry and Endodontics, Poznan University of Medical Sciences, Poznan, Poland.
| | - Jakub Jankowski
- Department of Conservative Dentistry and Endodontics, Poznan University of Medical Sciences, Poznan, Poland
| | - David Donnermeyer
- Department of Periodontology and Operative Dentistry, University Münster, Germany
| | - Paulo J Palma
- Center for Innovation and Research in Oral Sciences (CIROS) and Institute of Endodontics, Faculty of Medicine, University of Coimbra, Coimbra, Portugal
| | - Milan Drobac
- Faculty of Medicine, Department of Dental Medicine, University of Novi Sad, Serbia
| | - João Filipe Brochado Martins
- Department of Endodontology, Academic Centre for Dentistry Amsterdam, University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
| | | | | | - Muhammad Qasim Javed
- Department of Conservative Dental Sciences, College of Dentistry, Qassim University, Buraydah, Qassim, Saudi Arabia
| | - Hamad Mohammad Alharkan
- Department of Conservative Dental Sciences, College of Dentistry, Qassim University, Buraydah, Qassim, Saudi Arabia
| | - Olga Bekjanova
- Tashkent State Dental Institute, Department of Faculty Therapeutic Dentistry, Tashkent, Uzbekistan
| | - Sylvia Wyzga
- Department of Conservative Dentistry and Endodontics, Poznan University of Medical Sciences, Poznan, Poland
| | | | - Rutendo Kudenga
- Department of Odontology, University of Pretoria, Pretoria, Republic of South Africa
| | - Ömer Hatipoğlu
- Department of Restorative Dentistry, Niğde Ömer Halisdemir University, Turkiye
| | - Anna Surdacka
- Department of Conservative Dentistry and Endodontics, Poznan University of Medical Sciences, Poznan, Poland
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Pande D, Benjamin N, Rani V, Hina M, Haldar S, Nirmal H, Gole S, Ali MS. Comparative Evaluation of Fracture Resistance of Composite Core Buildup Materials: An In Vitro Study. Cureus 2024; 16:e63298. [PMID: 39070406 PMCID: PMC11283277 DOI: 10.7759/cureus.63298] [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] [Accepted: 06/27/2024] [Indexed: 07/30/2024] Open
Abstract
Aim This study aimed to compare the fracture resistance of different materials used in composite core buildups, including conventional filler composite, nanofiller composite, and short fiber-reinforced composite (SFRC). Methods This in vitro study was conducted on 30 freshly extracted premolars. The teeth were treated using a uniform endodontic procedure, and Fiber Posts (REFORPOST, Angelus) were placed. The teeth were then divided into three groups and restored using different materials. Group 1 was restored using SFRC (everX Posterior, GC, Europe), Group 2 using microfiller composite (Te-Econom Flow, Ivoclar Vivadent), and Group 3 using nanofiller composite (Tetric N-Flow, Ivoclar Vivadent). The restoration materials were then light-cured for 40 seconds. The teeth were placed in a Universal Testing Machine (Instron) and a load was applied with a stainless-steel ball (4 mm diameter) until the tooth fractured. The fracture load for each tooth was recorded, and after the mechanical test, the experimental groups were examined for failure modes. Statistical analysis was performed using SPSS version 21.0 software. A one-way ANOVA test was conducted to compare more than two groups, followed by Tukey's test for post hoc pairwise comparison. Results The mean fracture resistance of the microfiller composite (346.94±44.63) was the lowest among the three groups. When analyzed using Tukey's test at p<0.05, fracture resistance was significantly higher in the SFRC, followed by nanofillers and microfiller composites. Conclusion Due to the increasing demand for aesthetic restorations in recent years, composites have become important in modern restorative dentistry. The development and implementation of composite dental restorative materials rely on a comprehensive understanding of each composite component and consideration of methods for modifying each component. As a result, the findings of this study will be beneficial in determining which material to use based on specific cases.
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Affiliation(s)
- Deepmala Pande
- Department of Prosthodontics, Hitkarini Dental College and Hospital, Jabalpur, IND
| | - Niharika Benjamin
- Department of Public Health Dentistry, Hitkarini Dental College and Hospital, Jabalpur, IND
| | - Vishakha Rani
- Department of Public Health Dentistry, Dr. B.R. Ambedkar Institute of Dental Science and Hospital, Patna, IND
| | - Malik Hina
- Department of Prosthodontics, Saraswati Dental College, Lucknow, IND
| | - Shreya Haldar
- Department of Periodontics, Sardar Patel Post Graduate Institute of Dental and Medical Sciences, Lucknow, IND
| | - Harni Nirmal
- Department of Oral Surgery, Madha Dental College and Hospital, Chennai, IND
| | - Shivani Gole
- Department of Dentistry, Rishiraj College of Dental Sciences and Research Centre, Bhopal, IND
| | - Md Sadique Ali
- Department of Prosthodontics, Saraswati Dental College, Lucknow, IND
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Tohidkhah S, Jin J, Zhang A, Aregawi W, Morvaridi-Farimani R, Daisey EE, Zhang L, Fok ASL. Post-failure analysis of model resin-composite restorations subjected to different chemomechanical challenges. Dent Mater 2024; 40:889-896. [PMID: 38692997 PMCID: PMC11176011 DOI: 10.1016/j.dental.2024.04.005] [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: 10/22/2023] [Revised: 04/23/2024] [Accepted: 04/26/2024] [Indexed: 05/03/2024]
Abstract
OBJECTIVE The current study aimed to evaluate the effects of different combinations of chemical and mechanical challenges on the failure load, failure mode and composition of the resulting fracture surfaces of resin-composite restorations. METHODS Three resin composites were used to fill dentin disks (2 mm inner diameter, 5 mm outer diameter, and 2 mm thick) made from bovine incisor roots. The model restorations, half of which were preconditioned with a low-pH buffer (48 h under pH 4.5), were subjected to diametral compression with either a monotonically increasing load (fast fracture) or a cyclic load with a continuously increasing amplitude (accelerated fatigue). The load or number of cycles to failure was noted. SEM was performed on the fracture surfaces to determine the proportions of dentin, adhesive, and resin composite. RESULTS Both cyclic fatigue and acid preconditioning significantly reduced the failure load and increased the proportion of interfacial failure in almost all the cases, with cyclic fatigue having a more pronounced effect. Cyclic fatigue also increased the amount of adhesive/hybrid layer present on the fracture surfaces, but the effect of acid preconditioning on the composition of the fracture surfaces varied among the resin composites. SIGNIFICANCE The adhesive or hybrid layer was found to be the least resistant against the chemomechanical challenges among the components forming the model restoration. Increasing such resistance of the tooth-restoration interface, or its ability to combat the bacterial actions that lead to secondary caries following interfacial debonding, can enhance the longevity of resin-composite restorations.
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Affiliation(s)
- Saba Tohidkhah
- Minnesota Dental Research Center for Biomaterials and Biomechanics, School of Dentistry, University of Minnesota, Minneapolis, MN, USA
| | - Jiacheng Jin
- Minnesota Dental Research Center for Biomaterials and Biomechanics, School of Dentistry, University of Minnesota, Minneapolis, MN, USA
| | - Anqi Zhang
- Minnesota Dental Research Center for Biomaterials and Biomechanics, School of Dentistry, University of Minnesota, Minneapolis, MN, USA
| | - Wondwosen Aregawi
- Minnesota Dental Research Center for Biomaterials and Biomechanics, School of Dentistry, University of Minnesota, Minneapolis, MN, USA
| | - Reza Morvaridi-Farimani
- Minnesota Dental Research Center for Biomaterials and Biomechanics, School of Dentistry, University of Minnesota, Minneapolis, MN, USA
| | - Edward E Daisey
- Minnesota Dental Research Center for Biomaterials and Biomechanics, School of Dentistry, University of Minnesota, Minneapolis, MN, USA
| | - Lin Zhang
- Division of Biostatistics, School of Public Health, University of Minnesota, Minneapolis, MN, USA
| | - Alex S L Fok
- Minnesota Dental Research Center for Biomaterials and Biomechanics, School of Dentistry, University of Minnesota, Minneapolis, MN, USA.
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Ma Z, Chen Y, Wang R, Zhu M. Synthesis of polymerizable betulin maleic diester derivative for dental restorative resins with antibacterial activity. Dent Mater 2024; 40:941-950. [PMID: 38719709 DOI: 10.1016/j.dental.2024.04.007] [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: 12/05/2023] [Revised: 04/29/2024] [Accepted: 04/30/2024] [Indexed: 06/15/2024]
Abstract
OBJECTIVE Bisphenol A glycidyl methacrylate (Bis-GMA) is of great importance for dental materials as the preferred monomer. However, the presence of bisphenol-A (BPA) core in Bis-GMA structure causes potential concerns since it is associated with endocrine diseases, developmental abnormalities, and cancer lesions. Therefore, it is desirable to develop an alternative replacement for Bis-GMA and explore the intrinsic relationship between monomer structure and resin properties. METHODS Here, the betulin maleic diester derivative (MABet) was synthesized by a facile esterification reaction using plant-derived betulin and maleic anhydride as raw materials. Its chemical structure was confirmed by 1H and 13C NMR spectra, FT-IR spectra, and HR-MS, respectively. The as-synthesized MABet was then used as polymerizable comonomer to partially or completely substitute Bis-GMA in a 50:50 Bis-GMA: TEGDMA resin (5B5T) to formulate dental restorative resins. These were then determined for the viscosity behavior, light transmittance, real-time degree of conversion, residual monomers, mechanical performance, cytotoxicity, and antibacterial activity against Streptococcus mutans (S. mutans) in detail. RESULTS Among all experimental resins, increasing the MABet concentration to 50 wt% made the resultant 5MABet5T resin have a maximum in viscosity and appear dark yellowish after polymerization. In contrast, the 1MABet4B5T resin with 10 wt% MABet possessed comparable shear viscosity and polymerization conversion (46.6 ± 1.0% in 60 s), higher flexural and compressive strength (89.7 ± 7.8 MPa; 345.5 ± 14.4 MPa) to those of the 5B5T control (48.5 ± 0.6%; 65.7 ± 6.7 MPa; 223.8 ± 57.1 MPa). This optimal resin also had significantly lower S. mutans colony counts (0.35 ×108 CFU/mL) than 5B5T (7.6 ×108 CFU/mL) without affecting cytocompatibility. SIGNIFICANCE Introducing plant-derived polymerizable MABet monomer into dental restorative resins is an effective strategy for producing antibacterial dental materials with superior physicochemical property.
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Affiliation(s)
- Zhiyuan Ma
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
| | - Yifan Chen
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
| | - Ruili Wang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.
| | - Meifang Zhu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
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Saini RS, Binduhayyim RIH, Gurumurthy V, Alshadidi AAF, Aldosari LIN, Okshah A, Kuruniyan MS, Dermawan D, Avetisyan A, Mosaddad SA, Heboyan A. Dental biomaterials redefined: molecular docking and dynamics-driven dental resin composite optimization. BMC Oral Health 2024; 24:557. [PMID: 38735940 PMCID: PMC11089745 DOI: 10.1186/s12903-024-04343-1] [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: 12/16/2023] [Accepted: 05/07/2024] [Indexed: 05/14/2024] Open
Abstract
BACKGROUND Dental resin-based composites are widely recognized for their aesthetic appeal and adhesive properties, which make them integral to modern restorative dentistry. Despite their advantages, adhesion and biomechanical performance challenges persist, necessitating innovative strategies for improvement. This study addressed the challenges associated with adhesion and biomechanical properties in dental resin-based composites by employing molecular docking and dynamics simulation. METHODS Molecular docking assesses the binding energies and provides valuable insights into the interactions between monomers, fillers, and coupling agents. This investigation prioritizes SiO2 and TRIS, considering their consistent influence. Molecular dynamics simulations, executed with the Forcite module and COMPASS II force field, extend the analysis to the mechanical properties of dental composite complexes. The simulations encompassed energy minimization, controlled NVT and NPT ensemble simulations, and equilibration stages. Notably, the molecular dynamics simulations spanned a duration of 50 ns. RESULTS SiO2 and TRIS consistently emerged as influential components, showcasing their versatility in promoting solid interactions. A correlation matrix underscores the significant roles of van der Waals and desolvation energies in determining the overall binding energy. Molecular dynamics simulations provide in-depth insights into the mechanical properties of dental composite complexes. HEMA-SiO2-TRIS excelled in stiffness, BisGMA-SiO2-TRIS prevailed in terms of flexural strength, and EBPADMA-SiO2-TRIS offered a balanced combination of mechanical properties. CONCLUSION These findings provide valuable insights into optimizing dental composites tailored to diverse clinical requirements. While EBPADMA-SiO2-TRIS demonstrates distinct strengths, this study emphasizes the need for further research. Future investigations should validate the computational findings experimentally and assess the material's response to dynamic environmental factors.
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Affiliation(s)
- Ravinder S Saini
- Department of Dental Technology, COAMS, King Khalid University, Abha, Saudi Arabia
| | | | | | | | | | - Abdulmajeed Okshah
- Department of Dental Technology, COAMS, King Khalid University, Abha, Saudi Arabia
| | | | - Doni Dermawan
- Applied Biotechnology, Faculty of Chemistry, Warsaw University of Technology, Warsaw, Poland
| | - Anna Avetisyan
- Department of Therapeutic Stomatology, Faculty of Stomatology, Yerevan State Medical University after Mkhitar Heratsi, Yerevan, Armenia
| | - Seyed Ali Mosaddad
- Department of Research Analytics, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, India.
- Student Research Committee, School of Dentistry, Shiraz University of Medical Sciences, Qasr-E-Dasht Street, Shiraz, Iran.
| | - Artak Heboyan
- Department of Research Analytics, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, India.
- Department of Prosthodontics, Faculty of Stomatology, Yerevan State Medical University after Mkhitar Heratsi, Str. Koryun 2, 0025, Yerevan, Armenia.
- Department of Prosthodontics, School of Dentistry, Tehran University of Medical Sciences, North Karegar St, Tehran, Iran.
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7
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AlSheikh R, Almajed Y, Al Eid F, Zainaldeen S, Ahmad Siddiqui I, Gaffar B. The effect of beverage temperature on the surface roughness, microhardness, and color stability of the monoshade composite resin: An in vitro study. Saudi Dent J 2024; 36:740-744. [PMID: 38766290 PMCID: PMC11096599 DOI: 10.1016/j.sdentj.2024.03.002] [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: 11/10/2023] [Revised: 02/29/2024] [Accepted: 03/04/2024] [Indexed: 05/22/2024] Open
Abstract
Objective This study assessed the impact of beverage temperature on the surface roughness, microhardness, and color stability of monoshade composite resin. Materials and Methods A batch of 70 monoshade composite resin specimens manufactured by Charisma Diamond ONE (Kulzer, Hanau, Germany) was prepared. Initial readings for surface roughness, microhardness, and color were recorded. The specimens were then divided into seven groupings of ten each: Distilled water (control group), Nescafe coffee at 70 °C and 5 °C, Arabic coffee at 70 °C and 37 °C, and cola at 7 °C and 24 °C. These samples underwent 30-min daily immersion in their respective beverages for a duration of 30 days. Final measurements were then taken. A non-contact profilometer was used for measuring surface roughness, a Vickers microhardness machine from Contour GT-I (Bruker Nano GmbH, Berlin, Germany) for microhardness, and a Color-Eye 7000A Spectrophotometer (X-Rite, GretagMacbeth, Michigan USA) for color stability. Statistical analyses, including repeated measure ANOVA for microhardness, roughness, and color, were executed using SPSS version 23. Results All beverages led to changes in composite color and properties. Notably, coffee at 70 °C resulted in significant discoloration of the composite resin surface (p < 0.0001). The beverage that most affected the surface hardness and roughness of the monoshade composite resin was cola at 7 °C (p = 0.008). Conclusion The inherent chemicals in beverages, coupled with their temperatures, can influence the composite properties of resin, specifically surface discoloration, hardness, and roughness. Clinicians may, therefore, consider instructing patients about the potential negative effects of these beverages.
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Affiliation(s)
- Rasha AlSheikh
- Department of Restorative Dental Sciences, College of Dentistry, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia
| | - Youmna Almajed
- College of Dentistry, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia
| | - Fatimah Al Eid
- College of Dentistry, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia
| | - Sarah Zainaldeen
- College of Dentistry, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia
| | - Intisar Ahmad Siddiqui
- Department of Dental Education, College of Dentistry, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia
| | - Balgis Gaffar
- Department of Preventive Dental Sciences, College of Dentistry, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia
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8
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Ravandi R, Zeinali Heris S, Hemmati S, Aghazadeh M, Davaran S, Abdyazdani N. Effects of chitosan and TiO 2 nanoparticles on the antibacterial property and ability to self-healing of cracks and retrieve mechanical characteristics of dental composites. Heliyon 2024; 10:e27734. [PMID: 38524556 PMCID: PMC10957383 DOI: 10.1016/j.heliyon.2024.e27734] [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: 11/27/2023] [Revised: 02/25/2024] [Accepted: 03/06/2024] [Indexed: 03/26/2024] Open
Abstract
The aim of this study was to improve the self-healing properties of dental nanocomposite using nanoparticles of TiO2 and chitosan. We evaluated flexural and compressive strength, crack-healing, and self-healing lifespan after 3 months of water aging. The effect of the developed composite on cell viability and toxicity was assessed by an MTT assay on human alveolar basal epithelial cells (A549 cell line). The nanocomposite included 7.5 wt% polyurea-formaldehyde (PUF) and 0, 0.5, and 1 wt% n-TiO2 and chitosan. After the fracture, the samples were put in a mold for 1-90 days to enable healing. Then, the fracture toughness of the healed nanocomposites and the healing yield were measured. The flexural strength of the nanocomposite improved by adding 0.5 wt% n-TiO2, while the compressive strength increased after adding 0.5 wt% chitosan (p > 0.1). When these two materials were used simultaneously, the flexural strength was improved by around 2%; however, the compressive strength was unaffected. Compared to the other sample, the nanocomposite with 0.5 wt% n-TiO2 and chitosan had higher KIC-healing and self-healing efficiency. Self-healing efficacy had no significant effect of water aging over 90 days compared to one day (p > 0.1), demonstrating that the PUF nanocapsules were not damaged.
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Affiliation(s)
- Reza Ravandi
- Faculty of Chemical and Petroleum Engineering, University of Tabriz, Tabriz, Iran
| | - Saeed Zeinali Heris
- Faculty of Chemical and Petroleum Engineering, University of Tabriz, Tabriz, Iran
| | - Salar Hemmati
- Drug Applied Research Center, Tabriz University of Medical Sciences, 65811, Tabriz, Iran
| | - Marziyeh Aghazadeh
- Stem Cell Research Centre and Department of Oral Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Soodabeh Davaran
- Department of Medical Nanotechnology, Faculty of Advanced Medical Science, Tabriz University of Medical Sciences, Golgasht St, Tabriz, Iran
| | - Nima Abdyazdani
- Stem Cell Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
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9
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Szczesio-Wlodarczyk A, Garoushi S, Vallittu P, Bociong K, Lassila L. Polymerization shrinkage stress of contemporary dental composites: Comparison of two measurement methods. Dent Mater J 2024; 43:155-163. [PMID: 38296513 DOI: 10.4012/dmj.2023-192] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/02/2024]
Abstract
The aim of this study was to compare two testing methodologies employed for assessing the polymerization shrinkage stress of dental resin composites. Ten commercial resin composites were investigated (EverX Posterior & Flow; G-ænial Anterior, Posterior, A'CHORD & Universal Injectable; Filtek One Bulk Fill & Universal Restorative; SDR flow+ and Aura Bulk Fill). Photoelastic and contraction forces measurement methods were performed. The slope of the linear trendline and C-factor of specimens were calculated. The shrinkage stress values (range between: 6.4-13.4 MPa) obtained by the photoelastic method were higher for all resin composites than the values obtained by contraction forces measurements (range between 1.2-4.8 MPa). However, there was a strong linear correlation between these methods (r=0.8). The use of both investigated methods revealed important information about the shrinkage behavior of the restorative resin composites.
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Affiliation(s)
| | - Sufyan Garoushi
- Department of Biomaterials Science and Turku Clinical Biomaterials Center-TCBC, Institute of Dentistry, University of Turku
| | - Pekka Vallittu
- Department of Biomaterials Science and Turku Clinical Biomaterials Center-TCBC, Institute of Dentistry, University of Turku
- Wellbeing Services County of South-West Finland
| | - Kinga Bociong
- Department of General Dentistry, Medical University of Lodz
| | - Lippo Lassila
- Department of Biomaterials Science and Turku Clinical Biomaterials Center-TCBC, Institute of Dentistry, University of Turku
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10
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Wang Y, Xiao S, Lv S, Wang X, Wei R, Ma Y. Mechanical and Antimicrobial Properties of Boron Nitride/Methacrylic Acid Quaternary Ammonium Composites Reinforced Dental Flowable Resins. ACS Biomater Sci Eng 2024; 10:1796-1807. [PMID: 38346133 DOI: 10.1021/acsbiomaterials.3c01786] [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] [Indexed: 03/12/2024]
Abstract
Dental resin composites (DRCs) are commonly used to restore teeth affected by dental caries or defects. These materials must possess excellent properties to withstand the complex oral environment. The objective of this study was to prepare and characterize Boron nitride nanosheets (BNN)/ dimethyl amino hexadecyl methacrylate (DMAHDM) composites (BNN/DMA), and to evaluate them as functional fillers to enhance the mechanical and antimicrobial properties of dental resins. The BNN/DMA composites were successfully prepared under the theoretical guidance of molecular dynamics (MD), and then the physicochemical and morphological characterization of the BNN/DMA composites were carried out by using various test methods, such as FT-IR, XRD, UV-vis spectroscopy, SEM, TEM, and AFM. It was doped into the dental flowable resin in a certain proportion, and the results showed that the flexural strength (FS), elastic modulus (EM), compressive strength (CS), and microhardness (MH) of the modified resin composites were increased by 53.29, 47.8, 97.59, and 37.1%, respectively, with the addition of 0.8 wt % of BNN/DMA composite fillers. It has a good inhibition effect on Streptococcus mutans, with an inhibition rate as high as 90.43%. Furthermore, this effect persists even after one month of aging. In conclusion, the modification of flowable resins with low-concentration BNN/DMA composites favorably integrates the mechanical properties and long-term antimicrobial activity of dental resins. At the same time, they have good biocompatibility and do not affect the aesthetics. The BNN/DMA composite modified flowable resin has the potential to become a new type of antimicrobial dental restorative material.
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Affiliation(s)
- Yuting Wang
- School/Hospital of Stomatology, Lanzhou University, Lanzhou 730000, PR China
| | - Shengjie Xiao
- School/Hospital of Stomatology, Lanzhou University, Lanzhou 730000, PR China
| | - Siyi Lv
- School/Hospital of Stomatology, Lanzhou University, Lanzhou 730000, PR China
| | - Xiuzhi Wang
- School/Hospital of Stomatology, Lanzhou University, Lanzhou 730000, PR China
| | - Rong Wei
- School/Hospital of Stomatology, Lanzhou University, Lanzhou 730000, PR China
| | - Yu Ma
- School/Hospital of Stomatology, Lanzhou University, Lanzhou 730000, PR China
- Key Laboratory of Dental Maxillofacial Reconstruction and Biological Intelligence Manufacturing, Lanzhou University, Lanzhou 730000, PR China
- Biointerfaces Institute, University of Michigan, Ann Arbor,Michigan 48109, United States
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Rozza BY, El-Refai DA, Essawy HA, Alian GA. Effect of silanization of poly (urea-formaldehyde) microcapsules on the flexural strength and self-healing efficiency of an experimental self-healing dental resin composite (An in-vitro study). J Mech Behav Biomed Mater 2024; 151:106372. [PMID: 38211500 DOI: 10.1016/j.jmbbm.2024.106372] [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: 10/27/2023] [Revised: 01/01/2024] [Accepted: 01/02/2024] [Indexed: 01/13/2024]
Abstract
OBJECTIVES This study investigated the impact of using γ-methacryloxypropyl trimethoxy silane (MPS) for surface silanization of poly (urea-formaldehyde) (PUF) microcapsules which enclose a healing liquid of "triethylene glycol dimethacrylate (TEGDMA) and N,N dihydroxyethyl-p-toluidine (DHEPT)" on some mechanical properties of an experimental dental composite as well as its self-healing efficiency. METHODS Synthesis of PUF microcapsules was done via in situ polymerization, followed by silanization with MPS silane. Silanized and non-silanized microcapsules were incorporated into a composite containing 30% polymer matrix and 70% fillers at different weight percentages (0%, 5%, 7.5% and 10%). The composite strength and elastic modulus were evaluated by Flexural testing. Fracture toughness KIc and self-healing efficiency were assessed by utilizing the "single edge notched beam" method. RESULTS Flexural strength of all groups containing silanized microcapsules was non-significantly different from control group without microcapsules. However, in contrast to control group, all groups containing non-silanized microcapsules displayed considerably decreased flexural strength. Adding silanized and non-silanized microcapsules didn't show a significant change in the KIc-virgin. The silanized microcapsules' groups achieved a self-healing efficiency of about 49-77% recovery in KIc-virgin compared to 38-69% for their non-silanized counterparts. SIGNIFICANCE In order to increase the interfacial adhesion with the polymer matrix, improve the mechanical properties, and increase the efficiency of self-healing of dental resin composite, PUF microcapsules were silanized for the first time in the dental field using MPS silane. This innovative silanized microcapsule-containing self-healing composite may hold promise for repairing the damage caused by restorative cracks and extending their service life.
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Affiliation(s)
- Basma Yahya Rozza
- Biomaterials Department, Faculty of Dentistry, Ain Shams University (ASU), Biomaterials Research Laboratory, Organization of African Unity Street, El-Qobba Bridge, Al Weili, Cairo Governorate (P.O. 11566), Egypt.
| | - Dina Ahmed El-Refai
- Biomaterials Department, Faculty of Dentistry, Ain Shams University (ASU), Biomaterials Research Laboratory, Organization of African Unity Street, El-Qobba Bridge, Al Weili, Cairo Governorate (P.O. 11566), Egypt
| | - Hisham Abdelfattah Essawy
- Department of Polymers and Pigments, National Research Centre (NRC), 33 El Buhouth Street, AD Doqi, Dokki, Cairo Governorate (P.O. 12622), Egypt.
| | - Ghada Atef Alian
- Biomaterials Department, Faculty of Dentistry, Ain Shams University (ASU), Biomaterials Research Laboratory, Organization of African Unity Street, El-Qobba Bridge, Al Weili, Cairo Governorate (P.O. 11566), Egypt
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12
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Ismail HS, Ali AI. Effect of different restorative systems and aging on marginal adaptation of resin composites to deep proximal margins. J ESTHET RESTOR DENT 2024; 36:346-355. [PMID: 37515523 DOI: 10.1111/jerd.13116] [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: 04/10/2023] [Revised: 06/16/2023] [Accepted: 07/17/2023] [Indexed: 07/31/2023]
Abstract
OBJECTIVES To evaluate and compare the marginal integrity of different restorative systems bonded to proximal gingival dentin, and determine the consistency level of the results obtained by two in vitro methods. MATERIALS AND METHODS Thirty molars received occluso-mesial preparations with dentin/cementum gingival margins. They were divided into three groups and restored using different restorative systems with light-cured (Adhese Universal), self-cured (Palfique universal bond), and dual-cured (Futurabond U) adhesives. The restoration/gingival dentin interfaces were observed using scanning electron microscopy (SEM) and evaluated based on the World Dental Federation (FDI) criteria. After 10,000 thermal cycles, the marginal integrity was re-evaluated. Marginal integrity was evaluated by the percentage of continuous margin (% CM) at ×200 for SEM and as the frequency of each score within the FDI ranking. RESULTS No significant differences were found between the restorative systems immediately, however, the system with the light-cured adhesive had the lowest marginal integrity after aging. All tested restorative systems were adversely affected by aging. A moderate inverse correlation was identified between evaluation techniques. CONCLUSION The tested restorative systems utilizing self-cured and dual-cured adhesives may be preferable for achieving optimal marginal integrity when bonding to deep proximal margins, compared to the tested system with light-cured adhesive. CLINICAL SIGNIFICANCE When performing deep margin elevation, it is important to consider the adhesive system being used.
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Affiliation(s)
- Hoda S Ismail
- Operative Dentistry Department, Faculty of Dentistry, Mansoura University, Mansoura, Egypt
| | - Ashraf I Ali
- Operative Dentistry Department, Faculty of Dentistry, Mansoura University, Mansoura, Egypt
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13
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Schierz O. Modern Polymers for Dental Application. Biomedicines 2024; 12:252. [PMID: 38397854 PMCID: PMC10886479 DOI: 10.3390/biomedicines12020252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Accepted: 01/18/2024] [Indexed: 02/25/2024] Open
Abstract
Ceramics dominate clinical procedures in modern dentistry related to the artificial replacement of teeth with fixed dental prostheses, replacing metal-based frameworks on a large scale [...].
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Affiliation(s)
- Oliver Schierz
- Department of Prosthetic Dentistry and Material Sciences, University of Leipzig, Liebigstr. 12, 04107 Leipzig, Germany
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14
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Drejka P, Chrószcz-Porębska M, Kazek-Kęsik A, Chladek G, Barszczewska-Rybarek I. Chemical Modification of Dental Dimethacrylate Copolymer with Tetramethylxylylene Diisocyanate-Based Quaternary Ammonium Urethane-Dimethacrylates-Physicochemical, Mechanical, and Antibacterial Properties. MATERIALS (BASEL, SWITZERLAND) 2024; 17:298. [PMID: 38255466 PMCID: PMC10817292 DOI: 10.3390/ma17020298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Revised: 01/01/2024] [Accepted: 01/05/2024] [Indexed: 01/24/2024]
Abstract
In this study, two novel quaternary ammonium urethane-dimethacrylates (QAUDMAs) were designed for potential use as comonomers in antibacterial dental composite restorative materials. QAUDMAs were synthesized via the reaction of 1,3-bis(1-isocyanato-1-methylethyl)benzene with 2-(methacryloyloxy)ethyl-2-decylhydroxyethylmethylammonium bromide (QA10+TMXDI) and 2-(methacryloyloxy)ethyl-2-dodecylhydroxyethylmethylammonium bromide (QA12+TMXDI). Their compositions with common dental dimethacrylates comprising QAUDMA 20 wt.%, urethane-dimethacrylate monomer (UDMA) 20 wt.%, bisphenol A glycerolate dimethacrylate (Bis-GMA) 40 wt.%, and triethylene glycol dimethacrylate (TEGDMA) 20 wt.%, were photocured. The achieved copolymers were characterized for their physicochemical and mechanical properties, including their degree of conversion (DC), glass transition temperature (Tg), polymerization shrinkage (S), water contact angle (WCA), flexural modulus (E), flexural strength (FS), hardness (HB), water sorption (WS), and water leachability (WL). The antibacterial activity of the copolymers was characterized by the minimum bactericidal concentration (MBC) and minimum inhibitory concentration (MIC) against Staphylococcus aureus and Escherichia coli. The achieved results were compared to the properties of a typical dental copolymer comprising UDMA 40 wt.%, Bis-GMA 40 wt.%, and TEGDMA 20 wt.%. The introduction of QAUDMAs did not deteriorate physicochemical and mechanical properties. The WS and WL increased; however, they were still satisfactory. The copolymer comprising QA10+TMXDI showed a higher antibacterial effect than that comprising QA12+TMXDI and that of the reference copolymer.
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Affiliation(s)
- Patryk Drejka
- Department of Physical Chemistry and Technology of Polymers, Faculty of Chemistry, Silesian University of Technology, Strzody 9 Str., 44-100 Gliwice, Poland; (P.D.); (M.C.-P.)
| | - Marta Chrószcz-Porębska
- Department of Physical Chemistry and Technology of Polymers, Faculty of Chemistry, Silesian University of Technology, Strzody 9 Str., 44-100 Gliwice, Poland; (P.D.); (M.C.-P.)
| | - Alicja Kazek-Kęsik
- Department of Inorganic Chemistry, Analytical Chemistry and Electrochemistry, Faculty of Chemistry, Silesian University of Technology, Krzywoustego 6 Str., 44-100 Gliwice, Poland;
- Biotechnology Centre, Silesian University of Technology, Krzywoustego 8 Str., 44-100 Gliwice, Poland
| | - Grzegorz Chladek
- Department of Engineering Materials and Biomaterials, Faculty of Mechanical Engineering, Silesian University of Technology, Konarskiego 18A Str., 44-100 Gliwice, Poland;
| | - Izabela Barszczewska-Rybarek
- Department of Physical Chemistry and Technology of Polymers, Faculty of Chemistry, Silesian University of Technology, Strzody 9 Str., 44-100 Gliwice, Poland; (P.D.); (M.C.-P.)
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15
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Madhyastha PS, Naik DG, Natarajan S, Kumar Bhat MR, Vinodhini RS. Effects of Water Sorption and Solubility on Degradation of Silorane and Methacrylate-Based Dental Composites. Indian J Dent Res 2024; 35:76-79. [PMID: 38934754 DOI: 10.4103/ijdr.ijdr_195_23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Accepted: 10/11/2023] [Indexed: 06/28/2024] Open
Abstract
INTRODUCTION Wet oral environment may have deleterious effects on performance of the composites due to influences of water sorption and solubility. The study evaluated the hydrolytic degradation caused because of water sorption and solubility of silorane and methacrylate-based dental composites. METHODS Ten disc samples (2 mm × 10 mm) were prepared. Samples were analyzed for water solubility and sorption according to ISO 4049:2000 regulations and tested for mass gain or loss following immersion in water or in artificial saliva at 1 day, 15 days, and 30 days period. Student's 't' test, repeated measures analysis of variance (ANOVA), and Tukey's post-hoc tests determined statistical significance of the experimental results with global significance set at P = 0.05. RESULTS Considerable sorption and solubility was observed with time in both materials on immersion. Silorane composites showed lower water sorption and solubility than methacrylate-based composite (MBC). Artificial saliva demonstrated higher sorption and solubility compared to distilled water. CONCLUSION Silorane composites display enhanced hydrolytic stability even after a month of immersion in contrast to conventional methacrylate-based composites (MBCs), making it a better alternative to MBC resins clinically.
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Affiliation(s)
- Prashanthi S Madhyastha
- Department of Dental Materials, Manipal College of Dental Sciences, Mangalore, Karnataka, India
| | - Dilip G Naik
- Department of Periodontics, Manipal College of Dental Sciences, Mangalore, Karnataka, India
| | - Srikant Natarajan
- Department of Oral Pathology and Microbiology, Manipal College of Dental Sciences, Mangalore, Karnataka, India
| | - M R Kumar Bhat
- Department of Anatomy, Kasturba Medical College, Manipal, Karnataka, India
| | - Rachel S Vinodhini
- Department of Dental Materials, Manipal College of Dental Sciences, Mangalore, Karnataka, India
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16
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Zhang X, Zhang J, Zhang T, Yao S, Wang Z, Zhou C, Wu J. Novel low-shrinkage dental resin containing microcapsules with antibacterial and self-healing properties. J Mech Behav Biomed Mater 2023; 148:106212. [PMID: 37913623 DOI: 10.1016/j.jmbbm.2023.106212] [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: 09/28/2023] [Revised: 10/23/2023] [Accepted: 10/25/2023] [Indexed: 11/03/2023]
Abstract
Dental resin restorations commonly fail because of fractures and secondary caries. The aim of this research was to synthesize a novel low-shrinkage dental resin with antibacterial and self-healing properties. The low-shrinkage dental resin was obtained by incorporating a 20 wt% anti-shrinkage mixture of an expanding monomer 3,9-diethyl-3,9-dimethylol -1,5,7,11-tetraoxaspiro[5,5] undecane and an epoxy resin monomer diallyl bisphenol A diglycidyl ether (1:1, referred as "UE") and different mass fractions of self-healing antibacterial microcapsules (0%, 2.5%, 5%, 7.5%, and 10%) were incorporated into the matrix to prepare multifunctional dental resin. Polymerization shrinkage, mechanical properties, antibacterial activity, self-healing ability, and cytotoxicity of this dental resin were evaluated. The polymerization volumetric shrinkage of resin containing 20 wt% UE and 7.5 wt% microcapsules was reduced by 30.12% (4.13% ± 0.42%) compared with control. Furthermore, it exhibited high antibacterial activity and a good self-healing efficiency of 71% without adversely affecting the mechanical property and cell viability. This novel multifunctional dental resin with low polymerization shrinkage and excellent antibacterial activity and self-healing capability has potential application as a dental resin material to decrease the incidence of fractures and secondary caries.
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Affiliation(s)
- Xiaoran Zhang
- Department of Prosthodontics, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University & Shandong Key Laboratory of Oral Tissue Regeneration & Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration & Shandong Provincial Clinical Research Center for Oral Diseases, Jinan, 250012, China
| | - Jiajia Zhang
- Department of Prosthodontics, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University & Shandong Key Laboratory of Oral Tissue Regeneration & Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration & Shandong Provincial Clinical Research Center for Oral Diseases, Jinan, 250012, China
| | - Ting Zhang
- Department of Prosthodontics, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University & Shandong Key Laboratory of Oral Tissue Regeneration & Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration & Shandong Provincial Clinical Research Center for Oral Diseases, Jinan, 250012, China
| | - Shuo Yao
- Department of Prosthodontics, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University & Shandong Key Laboratory of Oral Tissue Regeneration & Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration & Shandong Provincial Clinical Research Center for Oral Diseases, Jinan, 250012, China
| | - Zonghua Wang
- Department of Prosthodontics, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University & Shandong Key Laboratory of Oral Tissue Regeneration & Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration & Shandong Provincial Clinical Research Center for Oral Diseases, Jinan, 250012, China
| | - Chuanjian Zhou
- Research Institute of Polymer Materials, School of Materials Science and Engineering, Shandong University, Jinan, 250061, China
| | - Junling Wu
- Department of Prosthodontics, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University & Shandong Key Laboratory of Oral Tissue Regeneration & Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration & Shandong Provincial Clinical Research Center for Oral Diseases, Jinan, 250012, China.
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17
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Popescu AD, Ţuculină MJ, Gheorghiță LM, Osman A, Nicolicescu C, Bugălă SA, Ionescu M, Abdul-Razzak J, Diaconu OA, Dimitriu B. An In Vitro Study regarding the Wear of Composite Materials Following the Use of Dental Bleaching Protocols. J Funct Biomater 2023; 14:532. [PMID: 37888197 PMCID: PMC10607896 DOI: 10.3390/jfb14100532] [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: 09/11/2023] [Revised: 10/14/2023] [Accepted: 10/17/2023] [Indexed: 10/28/2023] Open
Abstract
Composite materials used in dental restorations are considered resistant, long-lasting and aesthetic. As the wear of restorations is an important element in long-term use, the aim of this study was to evaluate the surface condition of nanohybrid and microfilled composite resins, after being subjected to the erosive action of dental bleaching protocols. This paper reflects a comparative study between one nanofilled composite and three microfilled composites used in restorations. For each composite, three sets of samples (under the form of composite discs) were created: a control group, an "office bleach" group with discs bleached with 40% hydrogen peroxide gel, and a "home bleach" group with discs bleached with 16% carbamide peroxide gel. Wear was numerically determined as the trace and the coefficients of friction obtained using a tribometer, the ball-on-disk test method, and two balls: alumina and sapphire. For all composite groups, there were statistically significant differences between the wear corresponding to the control and bleaching groups, for both testing balls. Regarding the composite type, the largest traces were recorded for GC Gradia direct anterior, for all groups, using the alumina ball. In contrast, for the sapphire ball, 3M ESPE Filtek Z550 was characterized by the largest traces. With respect to the friction coefficients, the "office bleach" group recorded the largest values, no matter the composite or the ball type used. The 3M ESPE Valux Plus composite recorded the largest friction coefficients for the alumina ball, and 3M ESPE Filtek Z550 for the sapphire ball. Overall, the "office bleach" group was characterized by higher composite wear, compared to the "home bleach" protocol or control group. Nanofilled composite resins showed superior wear resistance to microfilled resins after undergoing a bleaching protocol.
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Affiliation(s)
- Alexandru Dan Popescu
- Department of Endodontics, Faculty of Dental Medicine, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania; (A.D.P.); (L.M.G.); (S.A.B.); (O.A.D.)
| | - Mihaela Jana Ţuculină
- Department of Endodontics, Faculty of Dental Medicine, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania; (A.D.P.); (L.M.G.); (S.A.B.); (O.A.D.)
| | - Lelia Mihaela Gheorghiță
- Department of Endodontics, Faculty of Dental Medicine, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania; (A.D.P.); (L.M.G.); (S.A.B.); (O.A.D.)
| | - Andrei Osman
- Department of Anatomy and Embriology, Faculty of Dental Medicine, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania;
- Department ENT, Clinical Emergency County Hospital of Craiova, 200642 Craiova, Romania
| | - Claudiu Nicolicescu
- Department of Engineering and Management of the Technological Systems 1 Calugareni, Faculty of Mechanics, University of Craiova, 220153 Drobeta-Turnu Severin, Romania
| | - Smaranda Adelina Bugălă
- Department of Endodontics, Faculty of Dental Medicine, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania; (A.D.P.); (L.M.G.); (S.A.B.); (O.A.D.)
| | - Mihaela Ionescu
- Department of Medical Informatics and Biostatistics, Faculty of Dental Medicine, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania;
| | - Jaqueline Abdul-Razzak
- Department of Infant Care–Pediatrics–Neonatology & Doctoral School, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania;
| | - Oana Andreea Diaconu
- Department of Endodontics, Faculty of Dental Medicine, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania; (A.D.P.); (L.M.G.); (S.A.B.); (O.A.D.)
| | - Bogdan Dimitriu
- Department of Endodontics, Faculty of Dentistry, University of Medicine and Pharmacy Carol Davila Bucharest, 050474 Bucharest, Romania;
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18
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Almulhim KS, AlSheikh R, Abdalla M, Haridy R, Bugshan A, Smith S, Zeeshan M, Elgezawi M. Toward esthetically and biomechanically reliable anterior resin composite restorations: Current clinical experiences among dental practitioners in Saudi Arabia. F1000Res 2023; 12:359. [PMID: 37811197 PMCID: PMC10556563 DOI: 10.12688/f1000research.130981.2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 09/14/2023] [Indexed: 10/10/2023] Open
Abstract
Background: Esthetic anterior composite restorations are very challenging. They constitute a main part of the clinical practice of restoring teeth with resin composites. Distinctive variations in composite material selection and technique of application in anterior teeth exist when compared to the practice of restoring posterior teeth with resin composites. In a continuation of a previous assessment of class II resin composite practice, a cross-sectional survey study was performed to determine the awareness of general dental practitioners in Saudi Arabia about resin composite restorations in anterior teeth and to provide evidence-based recommendations to improve their practice. Methods: A total of 500 dental practitioners from different provinces in Saudi Arabia were invited to participate in an online questionnaire which comprised four domains and included a total of sixteen questions addressing aspects regarding the selection of resin composites, cavity configuration, etching protocol, light-curing technique, liner application, application of poly-chromatic composite, as well as finishing and polishing procedures. Chi square testing and descriptive statistics were used to analyze the attained data. Results: From 250 respondents, the greatest participation was from the Eastern and Middle provinces of Saudi Arabia. Female dentists participated less than males. There was no general agreement between participants regarding the resin composite material or the employed technique of application in restoring anterior tooth defects. Respondents indicated that discoloration and hypersensitivity were the most common reasons for patient's dissatisfaction with resin composites in anterior teeth. Conclusions: Dental practitioners are highly encouraged to improve their clinical practice of restoring anterior teeth using resin composites with the focus upon continuous education programs, online webinars, and workshops.
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Affiliation(s)
- Khalid S. Almulhim
- Restorative Dental Sciences, Imam Abdulrahman Bin faisal University, Dammam, Saudi Arabia, 1982, Saudi Arabia
| | - Rasha AlSheikh
- Restorative Dental Sciences, Imam Abdulrahman Bin faisal University, Dammam, Saudi Arabia, 1982, Saudi Arabia
| | - Moamen Abdalla
- Substitutive Dental sciences, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia, 1982, Saudi Arabia
| | - Rasha Haridy
- Clinical Dental sciences, Princess Nourah Bint Abdulrahman University, Riyadh, Saudi Arabia, Saudi Arabia
| | - Amr Bugshan
- Biomedical dental sciences, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia
| | - Stephen Smith
- Preventive Dental Sciences, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia
| | - Mohammed Zeeshan
- Medical Education, Imam Abdulrahman Bin Faisal University, Dmmam, Saudi Arabia
| | - Moataz Elgezawi
- Restorative Dental Sciences, Imam Abdulrahman Bin faisal University, Dammam, Saudi Arabia, 1982, Saudi Arabia
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19
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Leung BAY, Joe W, Mofarah SS, Sorrell CC, Abbasi R, Azadeh M, Arsecularatne JA, Koshy P. Unveiling the mechanisms behind surface degradation of dental resin composites in simulated oral environments. J Mater Chem B 2023; 11:7707-7720. [PMID: 37465918 DOI: 10.1039/d3tb00756a] [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: 07/20/2023]
Abstract
Dental resin composites are widely used as restorative materials due to their natural aesthetic and versatile properties. However, there has been limited research on the degradation mechanisms of these composites in gastric acid environments, which would be common in patients with gastroesophageal reflux. This study aims to investigate the degradation behavior of dental composites immersed in simulated oral environments, including acid, saliva, and water. Mechanical and morphological properties of the composites, upon immersion in the simulated environments, were thoroughly examined using hardness testing and SEM imaging. Qualitative analyses of the ions leached from the polymer matrix and fillers were conducted using XPS and ICP-MS. In addition, the thermodynamic stability of the inorganic fillers of the composites in aqueous solutions across a wide range of pH values was theoretically studied through construction of Pourbaix diagrams. This study proposed a mechanism for composite leaching involving interactions between the matrix's hydrophilic groups and the aqueous immersion media, leading to swelling and chemical degradation of the composites. Furthermore, it was demonstrated that filler leaching was followed by ion exchange with Ca and P, resulting in the formation of hard calcified layers on the composite surface. The current findings provide valuable insights into the development of new composite materials with improved durability and resistance to degradation, especially for patients suffering from gastroesophageal reflux.
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Affiliation(s)
- Brenda Ah-Yan Leung
- School of Materials Science and Engineering, UNSW Sydney, NSW 2052, Australia.
| | - William Joe
- School of Materials Science and Engineering, UNSW Sydney, NSW 2052, Australia.
| | - Sajjad S Mofarah
- School of Materials Science and Engineering, UNSW Sydney, NSW 2052, Australia.
| | - Charles C Sorrell
- School of Materials Science and Engineering, UNSW Sydney, NSW 2052, Australia.
| | - Roozbeh Abbasi
- School of Materials Science and Engineering, UNSW Sydney, NSW 2052, Australia.
| | - Mohsen Azadeh
- School of Materials Science and Engineering, Sharif University of Technology, Tehran, Iran
| | | | - Pramod Koshy
- School of Materials Science and Engineering, UNSW Sydney, NSW 2052, Australia.
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Alessa NA. Effect of mouthwashes on the microhardness of aesthetic composite restorative materials. An Sist Sanit Navar 2023; 46:e1049. [PMID: 37647204 PMCID: PMC10520749 DOI: 10.23938/assn.1049] [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: 06/26/2023] [Revised: 07/11/2023] [Accepted: 07/21/2023] [Indexed: 09/01/2023]
Abstract
BACKGROUND Mouthwashes are increasingly being used worldwide. However, these preparations are known to have a negative impact on composite resin dental restorations. In this study, we aim to evaluate the effect of mouthwashes on the microhardness of such restorations. METHODS Thirty specimens of Tetric N-Ceram composite were prepared. Each composite specimen was cured for 40 seconds and kept in saline solution for 24 hours at 37 °C. Baseline microhardness of each specimen was recorded using an Innovatest Vickers Micro Hardness Tester. Composite specimens were randomly placed in 20 mL of the selected mouthwashes (Colgate® Plax, Listerine® Teeth & Gum Defence, and Closeup® Antibacterial Mouthwash Cool Breeze) and stored in an incubator for 24 hours at 37 °C. Next, microhardness values were rechecked. pH measurements were recorded for each type of mouthwash using a digital pH meter. RESULTS Due to the acidic nature of Colgate® and Listerine®, the microhardness of the restorations decreased with these mouthwashes; Listerine® caused the greatest decrease in microhardness and had the lowest pH reading (4.34). For Closeup®, with a neutral pH (7.02), no negative effect on microhardness was found; on the contrary, due to the presence of zinc in this latter mouthwash, an increase of the microhardness was found. CONCLUSIONS We confirm the negative effect of acidic mouthwashes on the microhardness of composite dental restorations.
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21
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Maletin A, Ristić I, Nešić A, Knežević MJ, Koprivica DĐ, Cakić S, Ilić D, Milekić B, Puškar T, Pilić B. Development of Light-Polymerized Dental Composite Resin Reinforced with Electrospun Polyamide Layers. Polymers (Basel) 2023; 15:2598. [PMID: 37376244 DOI: 10.3390/polym15122598] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Revised: 06/01/2023] [Accepted: 06/02/2023] [Indexed: 06/29/2023] Open
Abstract
As the mechanical properties of resin-based dental composite materials are highly relevant in clinical practice, diverse strategies for their potential enhancement have been proposed in the extant literature, aiming to facilitate their reliable use in dental medicine. In this context, the focus is primarily given to the mechanical properties with the greatest influence on clinical success, i.e., the longevity of the filling in the patient's mouth and its ability to withstand very strong masticatory forces. Guided by these objectives, the goal of the present study was to ascertain whether the reinforcement of dental composite resins with electrospun polyamide (PA) nanofibers would improve the mechanical strength of dental restoration materials. For this purpose, light-cure dental composite resins were interspersed with one and two layers comprising PA nanofibers in order to investigate the influence of such reinforcement on the mechanical properties of the resulting hybrid resins. One set of the obtained samples was investigated as prepared, while another set was immersed in artificial saliva for 14 days and was subsequently subjected to the same set of analyses, namely Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and differential scanning calorimetry (DSC). Findings yielded by the FTIR analysis confirmed the structure of the produced dental composite resin material. They also provided evidence that, while the presence of PA nanofibers did not influence the curing process, it strengthened the dental composite resin. Moreover, flexural strength measurements revealed that the inclusion of a 16 μm-thick PA nanolayer enabled the dental composite resin to withstand a load of 3.2 MPa. These findings were supported by the SEM results, which further indicated that immersing the resin in saline solution resulted in a more compact composite material structure. Finally, DSC results indicated that as-prepared as well as saline-treated reinforced samples had a lower glass transition temperature (Tg) compared to pure resin. Specifically, while pure resin had a Tg of 61.6 °C, each additional PA nanolayer decreased the Tg by about 2 °C, while the further reduction was obtained when samples were immersed in saline for 14 days. These results show that electrospinning is a facile method for producing different nanofibers that can be incorporated into resin-based dental composite materials to modify their mechanical properties. Moreover, while their inclusion strengthens the resin-based dental composite materials, it does not affect the course and outcome of the polymerization reaction, which is an important factor for their use in clinical practice.
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Affiliation(s)
| | - Ivan Ristić
- Faculty of Technology, University of Novi Sad, 21000 Novi Sad, Serbia
| | - Aleksandra Nešić
- Faculty of Technology, University of Novi Sad, 21000 Novi Sad, Serbia
| | | | | | - Suzana Cakić
- Faculty of Technology, University of Niš, 16000 Leskovac, Serbia
| | - Dušica Ilić
- Faculty of Electronic Engineering, University of Niš, 18000 Niš, Serbia
| | - Bojana Milekić
- Faculty of Medicine, University of Novi Sad, 21000 Novi Sad, Serbia
| | - Tatjana Puškar
- Faculty of Medicine, University of Novi Sad, 21000 Novi Sad, Serbia
| | - Branka Pilić
- Faculty of Technology, University of Novi Sad, 21000 Novi Sad, Serbia
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22
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Popescu AD, Tuculina MJ, Diaconu OA, Gheorghiță LM, Nicolicescu C, Cumpătă CN, Petcu C, Abdul-Razzak J, Rîcă AM, Voinea-Georgescu R. Effects of Dental Bleaching Agents on the Surface Roughness of Dental Restoration Materials. MEDICINA (KAUNAS, LITHUANIA) 2023; 59:1067. [PMID: 37374271 DOI: 10.3390/medicina59061067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 05/27/2023] [Accepted: 05/30/2023] [Indexed: 06/29/2023]
Abstract
Background and Objectives: This study aimed to evaluate the surface roughness evolution of several finished and polished composites when bleaching materials are applied. The research was conducted on four microhybrid or nanofilled composites that are used in dental restorations. Materials and Methods: For each composite type, 5 samples were selected for control, 5 samples were subjected to the bleaching protocol "office bleach" with 40% hydrogen peroxide, and 5 other samples were subjected to the "home bleach" protocol with 16% carbamide peroxide, resulting in a total number of 60 samples. The surfaces of all the samples were tested for roughness, and the values of the most relevant parameter (Ra), were collected. Comparisons between composites and samples were performed using one-way ANOVA (in Statistical Package for Social Sciences). Results: After the bleaching protocol with 40% hydrogen peroxide gel, it was found that the roughness of the group increased considerably compared to the control group, so the highest roughness was found at GC Gradia direct anterior group, and the lowest value was registered for the 3M ESPE Valux Plus group. Following the bleaching protocol with 16% carbamide peroxide (home bleach), it was noted that the sample surfaces were not as affected. In this case, the lowest roughness was found at 3M ESPE Valux Plus group, and the highest roughness was registered for the GC G-aenial anterior group. Following the interpretation of the results, all four types of dental composites tested showed significant surface roughness differences between the groups subjected to bleaching protocols and those kept as control (p < 0.05). Conclusions: The surfaces of the samples were affected by the bleaching protocols by increasing the roughness compared to the control samples.
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Affiliation(s)
- Alexandru Dan Popescu
- Department of Endodontics, Faculty of Dental Medicine, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | - Mihaela Jana Tuculina
- Department of Endodontics, Faculty of Dental Medicine, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | - Oana Andreea Diaconu
- Department of Endodontics, Faculty of Dental Medicine, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | - Lelia Mihaela Gheorghiță
- Department of Endodontics, Faculty of Dental Medicine, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | - Claudiu Nicolicescu
- Department of Engineering and Management of the Technological Systems, Faculty of Mechanics, University of Craiova, 1 Calugareni, 220037 Drobeta-Turnu Severin, Romania
| | - Cristian Niky Cumpătă
- Faculty of Dental Medicine, University Titu Maiorescu of Bucharest, 031593 Bucharest, Romania
| | - Cristiana Petcu
- Department of Prosthodontics, Faculty of Dental Medicine, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | - Jaqueline Abdul-Razzak
- Department of Infant Care-Pediatrics-Neonatology & Doctoral School, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | - Ana Maria Rîcă
- Department of Endodontics, Faculty of Dental Medicine, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
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23
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Jakupović S, Pervan N, Mešić E, Gavranović-Glamoč A, Bajsman A, Muratović E, Kazazić L, Kantardžić-Kovačević A. Assessment of Microhardness of Conventional and Bulk-Fill Resin Composites Using Different Light-Curing Intensity. Polymers (Basel) 2023; 15:polym15102250. [PMID: 37242825 DOI: 10.3390/polym15102250] [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: 03/28/2023] [Revised: 04/25/2023] [Accepted: 05/04/2023] [Indexed: 05/28/2023] Open
Abstract
(1) Background: This study evaluates the effect of a conventional/low-voltage light-curing protocol (LV protocol) (10 s with 1340 mW/cm2) and high-voltage light-curing protocol (HV protocol) (3 s with 3440 mW/cm2) on the microhardness (MH) of dental resin-based composites (RBCs). Five resin composites were tested: conventional Evetric (EVT), Tetric Prime (TP), Tetric Evo Flow (TEF), bulk-fill Tetric Power Fill (PFL), and Tetric Power Flow (PFW). (2) Materials and Methods: Two tested composites (PFW and PFL) were designed for high-intensity light curing. The samples were made in the laboratory in specially designed cylindrical molds; diameter = 6 mm and height = 2 or 4 mm, depending on the type of composite. Initial MH was measured on the top and bottom surfaces of composite specimens 24 h after light curing using a digital microhardness tester (QNESS 60 M EVO, ATM Qness GmbH, Mammelzen, Germany). The correlation between the filler content (wt%, vol%) and the MH of the RBCs was tested. For the calculation of depth-dependent curing effectiveness, the bottom/top ratio for initial MH was used. (3) Conclusions: MH of RBCs is more dependent on material composition than on light-curing protocol. Filler wt% has a greater influence on MH values compared to filler vol%. The bottom/top ratio showed values over 80% for bulk composites, while for conventional sculptable composites, borderline or suboptimal values were measured for both curing protocols.
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Affiliation(s)
- Selma Jakupović
- Department of Restorative Dentistry and Endodontics, Faculty of Dentistry with Clinics, University of Sarajevo, 71000 Sarajevo, Bosnia and Herzegovina
| | - Nedim Pervan
- Department of Mechanical Design, Faculty of Mechanical Engineering, University of Sarajevo, 71000 Sarajevo, Bosnia and Herzegovina
| | - Elmedin Mešić
- Department of Mechanical Design, Faculty of Mechanical Engineering, University of Sarajevo, 71000 Sarajevo, Bosnia and Herzegovina
| | - Alma Gavranović-Glamoč
- Department of Prosthodontics, Faculty of Dentistry with Clinics, University of Sarajevo, 71000 Sarajevo, Bosnia and Herzegovina
| | - Anita Bajsman
- Department of Dental Morphology with Dental Anthropology and Forensics, Faculty of Dentistry with Clinics, University of Sarajevo, 71000 Sarajevo, Bosnia and Herzegovina
| | - Enis Muratović
- Department of Mechanical Design, Faculty of Mechanical Engineering, University of Sarajevo, 71000 Sarajevo, Bosnia and Herzegovina
| | - Lejla Kazazić
- Department of Prosthodontics, Faculty of Dentistry with Clinics, University of Sarajevo, 71000 Sarajevo, Bosnia and Herzegovina
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24
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Islam MS, Nassar M, Elsayed MA, Jameel DB, Ahmad TT, Rahman MM. In Vitro Optical and Physical Stability of Resin Composite Materials with Different Filler Characteristics. Polymers (Basel) 2023; 15:polym15092121. [PMID: 37177267 PMCID: PMC10180670 DOI: 10.3390/polym15092121] [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: 03/22/2023] [Revised: 04/22/2023] [Accepted: 04/26/2023] [Indexed: 05/15/2023] Open
Abstract
The objective of this study was to compare the physical and optical stability of resin composite materials with different filler characteristics. Ninety-six resin composite blocks (6 mm × 6 mm × 2 mm) were prepared using four different types of resin composite, divided into four groups. Specimens from the same material were randomly divided into four groups (n = 6) and allocated for Vickers hardness (VH), water sorption, solubility (WS/SL), and staining and aging challenges tests. One-way ANOVA showed significant differences in microhardness (p = 0.0001), WS (p = 0.0001), and SL (p = 0.003) among the tested groups. Beautifil II LS recorded the highest hardness, and CharmFil®Flow had the lowest value. Beautifil Injectable X and II LS showed negative WS, whereas the other groups had positive values. All groups showed positive SL. Repeated measures ANOVA showed significant color parameter alteration in the tested groups (p = 0.0001). All groups showed significant color shifting after one week of the staining challenge. Repeated measures ANOVA showed a significant color parameter (p = 0.0001) and weight (p = 0.001) alteration after the aging challenge. The optical and physical stability of resin composites may vary according to filler characteristics. Clinicians should choose the composite as per the desired outcome.
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Affiliation(s)
- Md Sofiqul Islam
- RAK College of Dental Sciences, RAK Medical and Health Sciences University, Ras Al-Khaimah P.O. Box 12973, United Arab Emirates
| | - Mohannad Nassar
- Department of Preventive and Restorative Dentistry, College of Dental Medicine, University of Sharjah, Sharjah P.O. Box 27272, United Arab Emirates
| | - Mohamed Ahmed Elsayed
- RAK College of Dental Sciences, RAK Medical and Health Sciences University, Ras Al-Khaimah P.O. Box 12973, United Arab Emirates
- Department of Endodontics, Faculty of Dentistry, Assiut University, Assiut 71515, Egypt
| | - Dania Burhan Jameel
- RAK College of Dental Sciences, RAK Medical and Health Sciences University, Ras Al-Khaimah P.O. Box 12973, United Arab Emirates
| | - Thana Tariq Ahmad
- RAK College of Dental Sciences, RAK Medical and Health Sciences University, Ras Al-Khaimah P.O. Box 12973, United Arab Emirates
| | - Muhammed Mustahsen Rahman
- RAK College of Dental Sciences, RAK Medical and Health Sciences University, Ras Al-Khaimah P.O. Box 12973, United Arab Emirates
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25
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Kong X, Han Q, Jiang A, Wang Y, Li R, Wang Y, Xiao S, Wei R, Ma Y. BNN/TiO 2 nanocomposite system-modified dental flow resins and the mechanism of the enhancement of mechanical and antibacterial properties. Biomater Sci 2023; 11:2775-2786. [PMID: 36825578 DOI: 10.1039/d2bm01848a] [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: 02/11/2023]
Abstract
Robust and antibacterial dental resins are essential for repairing the shape and function of the teeth. However, an ingenious way to achieve a synergistic enhancement of these two properties is still lacking. In this work, guided by molecular dynamics (MD) calculations, a boron nitride nanosheet (BNN)/titanium dioxide (TiO2) nanocomposite system was synthesized and used to modify the dental flow resin to enhance its mechanical and antimicrobial properties. The mechanical and antimicrobial enhancement mechanisms were further explored. The modified resin demonstrated outstanding performance improvement with 88.23%, 58.47%, 82.01%, and 55.06% improvement in compressive strength (CS), microhardness (MH), flexural strength (FS), and elastic modulus (EM), respectively. Moreover, the modified resin could effectively inhibit the growth of Streptococcus mutans (S. mutans) regardless of aging in water and the inhibition rates were more than 90%. In conclusion, the modified resin is expected to be an ideal restorative material for clinical applications.
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Affiliation(s)
- Xinzi Kong
- School/Hospital of Stomatology, Lanzhou University, Lanzhou 730000, PR China.
| | - Qize Han
- School/Hospital of Stomatology, Lanzhou University, Lanzhou 730000, PR China.
| | - Axue Jiang
- School/Hospital of Stomatology, Lanzhou University, Lanzhou 730000, PR China.
| | - Yurui Wang
- School/Hospital of Stomatology, Lanzhou University, Lanzhou 730000, PR China.
| | - Ruizhi Li
- School/Hospital of Stomatology, Lanzhou University, Lanzhou 730000, PR China.
| | - Yuting Wang
- School/Hospital of Stomatology, Lanzhou University, Lanzhou 730000, PR China.
| | - Shengjie Xiao
- School/Hospital of Stomatology, Lanzhou University, Lanzhou 730000, PR China.
| | - Rong Wei
- School/Hospital of Stomatology, Lanzhou University, Lanzhou 730000, PR China.
| | - Yu Ma
- School/Hospital of Stomatology, Lanzhou University, Lanzhou 730000, PR China.
- Key Laboratory of Dental Maxillofacial Reconstruction and Biological Intelligence Manufacturing, Lanzhou University, Lanzhou 730000, PR China
- Biointerfaces Institute, University of Michigan, Ann Arbor, MI 48109, USA
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26
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YEŞİL ACAR Z, TUNÇ KOÇYİĞİT M, ASİLTÜRK M. Investigation of the effect of matrix-interface formed with silane-based coupling agents on physico-chemical behavior and flow distance of dental composites. J Mol Liq 2023. [DOI: 10.1016/j.molliq.2023.121600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
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27
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Tejada-Casado M, Ghinea R, Pérez MM, Ruiz-López J, Lübbe H, Herrera LJ. Development of Thickness-Dependent Predictive Methods for the Estimation of the CIEL*a*b* Color Coordinates of Monolithic and Layered Dental Resin Composites. MATERIALS (BASEL, SWITZERLAND) 2023; 16:761. [PMID: 36676498 PMCID: PMC9864169 DOI: 10.3390/ma16020761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Revised: 01/07/2023] [Accepted: 01/09/2023] [Indexed: 06/17/2023]
Abstract
Usually, dentin and enamel shades are layered in dental restorations with the purpose of mimicking the natural appearance of teeth. The main objective of this study was to develop and assess accuracy of a color-prediction method for both monolithic and layered dental resin-based composites with varying shades and under different illuminants. A total of 15 different shades of VITAPAN Excell, VITAPAN Dentine and VITA Physiodens as well as VITA Enamel of five different thicknesses (0.5-2.5 mm range) were used to manufacture monolithic and layered samples. A non-contact spectroradiometer with CIE 45∘/0∘ geometry was used to measure the color of all samples over a standard ceramic black background. Second-degree polynomial regression was used as predictive method for CIE-L*a*b* color coordinates. Performance of predictive models was tested using the CIEDE2000 total color difference formula (ΔE00), while accuracy was evaluated by comparative assessment of ΔE00 with corresponding 50:50% acceptability (AT00) and perceptibly (PT00) thresholds for dentistry. A mean color difference between measured (real) and predicted color of ΔE00=1.71, with 62.86% of the color differences below AT00 and 28.57% below PT00, was registered for monolithic samples. For bi-layered samples, the mean color difference was roughly ΔE00=0.50, with generally 100% and more than 85% of the estimations below AT00 and PT00, respectively. The predictive method allowed highly accurate color estimations for both monolithic and layered dental resin-based composites with varying thicknesses and under different illuminations. These results could be useful to maximize the clinical success of dental restorations.
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Affiliation(s)
- Maria Tejada-Casado
- Department of Optics, Faculty of Science, Campus Fuentenueva, Edificio Mecenas, s/n., University of Granada, ibsGranada, 18071 Granada, Spain
- Instituto de Investigación Biosanitaria ibs.GRANADA, 18011 Granada, Spain
| | - Razvan Ghinea
- Department of Optics, Faculty of Science, Campus Fuentenueva, Edificio Mecenas, s/n., University of Granada, ibsGranada, 18071 Granada, Spain
- Department of Physics, Faculty of Sciences, University of Craiova, 13 AI Cuza Street, 200585 Craiova, Romania
| | - María M. Pérez
- Department of Optics, Faculty of Science, Campus Fuentenueva, Edificio Mecenas, s/n., University of Granada, ibsGranada, 18071 Granada, Spain
- Instituto de Investigación Biosanitaria ibs.GRANADA, 18011 Granada, Spain
| | - Javier Ruiz-López
- Department of Optics, Faculty of Science, Campus Fuentenueva, Edificio Mecenas, s/n., University of Granada, ibsGranada, 18071 Granada, Spain
- Instituto de Investigación Biosanitaria ibs.GRANADA, 18011 Granada, Spain
| | - Henning Lübbe
- Vita Zahnfabrik H. Rauter GmbH & Co. KG, Ballyweg 6, 79713 Bad-Säckingen, Germany
| | - Luis Javier Herrera
- Instituto de Investigación Biosanitaria ibs.GRANADA, 18011 Granada, Spain
- Computer Architecture and Technology Department, University of Granada, 18071 Granada, Spain
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28
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Kula Z, Klimek L, Kopacz K, Śmielak B. Evaluation of the Effect of the Addition of Hydroxyapatite on Selected Mechanical and Tribological Properties of a Flow-Type Composite. MATERIALS (BASEL, SWITZERLAND) 2022; 15:9016. [PMID: 36556822 PMCID: PMC9787188 DOI: 10.3390/ma15249016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/05/2022] [Revised: 12/06/2022] [Accepted: 12/14/2022] [Indexed: 06/17/2023]
Abstract
(1) Background: The aim of the study was to determine the effect of modification with sintered hydroxyapatite (HAp) on selected mechanical and tribological properties of a flow-type composite. (2) Methods: Samples in the shapes of cuboidal beams (n = 120) and cylinders (n = 120) with the proper dimensions were prepared from a standard flow-type composite and others with the addition of 2% wt., 5% wt., and 8% wt. sintered hydroxyapatite. The bending strength, compression strength, diametral compression strength, impact resistance, hardness, and tribological properties were compared. (3) Results: In all cases, it was established that an increase in the amount of HAp caused a reduction in the bending, compression, and diametral compression strength. Increasing the amount of added HAp also reduced the impact strength, hardness, and wear resistance. However, the differences were statistically insignificant. (4) Conclusions: The addition of hydroxyapatite to a flow-type composite material worsened its mechanical and tribological properties; however, the obtained values were acceptable with 2% wt. and 5% wt. HAp.
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Affiliation(s)
- Zofia Kula
- Department of Dental Technology, Medical University of Lodz, Pomorska Str. 251, 92-213 Lodz, Poland
| | - Leszek Klimek
- Institute of Materials Science and Engineering, Lodz University of Technology, Stefanowskiego Str. 1/15, 90-924 Lodz, Poland
| | - Karolina Kopacz
- “Dynamo Lab” Academic Laboratory of Movement and Human Physical Performance, Medical University of Lodz, Pomorska Str. 251, 92-215 Lodz, Poland
| | - Beata Śmielak
- Department of Prosthodontics, Medical University of Lodz, Pomorska Str. 251, 92-213 Lodz, Poland
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Biomaterials and Clinical Applications of Customized Healing Abutment-A Narrative Review. J Funct Biomater 2022; 13:jfb13040291. [PMID: 36547551 PMCID: PMC9781385 DOI: 10.3390/jfb13040291] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Revised: 12/03/2022] [Accepted: 12/06/2022] [Indexed: 12/14/2022] Open
Abstract
Customized healing abutments have been introduced in clinical practice along with implant surgery to preserve or create natural-appearing hard and soft tissue around the implant. This provides the benefits of reducing the overall treatment time by eliminating the second stage and reducing the elapsed time of the fabrication of the final prostheses. This article aims to review the types and properties of materials used for the fabrication of customized healing abutments and their clinical applications. Articles published in English on customized healing abutments were searched in Google Scholar, PubMed/MEDLINE, ScienceDirect, and the Scopus databases up to August 2022. The relevant articles were selected and included in this literature review. Customized healing abutments can be fabricated from materials available for dental implants, including PEEK, PMMA, zirconia, resin composite, and titanium. All the materials can be used following both immediate and delayed implant placement. Each material provides different mechanical and biological properties that influence the peri-implant tissues. In conclusion, the studies have demonstrated promising outcomes for all the materials. However, further investigation comparing the effects of each material on peri-implant soft and hard tissues is required.
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30
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Yang B, Aregawi W, Chen R, Zhang L, Wang Y, Fok A. Accelerated Fatigue Model for Predicting Composite Restoration Failure. J Dent Res 2022; 101:1606-1612. [PMID: 36199249 PMCID: PMC9703530 DOI: 10.1177/00220345221126928] [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: 11/17/2022] Open
Abstract
An empirical method is proposed to predict the clinical performance of resin composite dental restorations by using laboratory data derived from simple specimens subjected to chemical degradation and accelerated cyclic fatigue. Three resin composites were used to fill dentin disks (2-mm inner diameter, 5-mm outer diameter, and 2 mm thick) made from bovine incisor roots. The specimens (n = 30 per group) were aged with different durations of a low-pH challenge (0, 24, and 48 h under pH 4.5) before being subjected to diametral compression with either a monotonically increasing load (fast fracture) or a cyclic load with a continuously increasing amplitude (accelerated fatigue). The data from 1 material were used to establish the relationship between laboratory time (number of cycles) and clinical time to failure (years) via the respective survival probability curves. The temporal relationship was then used to predict the clinical rates of failure for restorations made of the other 2 materials, and the predictions were compared with the clinical data to assess their accuracy. Although there were significant differences in the fast fracture strength among the groups of materials or durations of chemical challenge, fatigue testing was much better at separating the groups. Linear relationships were found between the laboratory and clinical times to failure for the first material (R2 = 0.90, 0.90, and 0.62 for the 0-, 24-, and 48-h low-pH groups, respectively). The clinical life of restorations made of the other 2 materials was best predicted with data from the 48-h low-pH groups. In conclusion, an accelerated fatigue model was successfully calibrated and applied to predict the clinical failure of resin composite restorations, and the predictions based on data obtained from chemically aged specimens provided the best agreement with clinical data.
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Affiliation(s)
- B. Yang
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University; Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, China
| | - W. Aregawi
- Minnesota Dental Research Center for Biomaterials and Biomechanics, School of Dentistry, University of Minnesota, Minneapolis, MN, USA
| | - R. Chen
- Minnesota Dental Research Center for Biomaterials and Biomechanics, School of Dentistry, University of Minnesota, Minneapolis, MN, USA
| | - L. Zhang
- Divison of Biostatistics, School of Public Health, University of Minnesota, Minneapolis, MN, USA
| | - Y. Wang
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University; Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, China
| | - A.S.L. Fok
- Minnesota Dental Research Center for Biomaterials and Biomechanics, School of Dentistry, University of Minnesota, Minneapolis, MN, USA
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Jain C, Surabhi P, Marathe K. Critical Review on the Developments in Polymer Composite Materials for Biomedical Implants. JOURNAL OF BIOMATERIALS SCIENCE, POLYMER EDITION 2022; 34:893-917. [PMID: 36369719 DOI: 10.1080/09205063.2022.2145870] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
There has been a lack of research for developing functional polymer composites for biomedical implants. Even though metals are widely used as implant materials, there is a need for developing polymer composites as implant materials because of the stress shielding effect that causes a lack of compatibility of metals with the human body. This review aims to bring out the latest developments in polymer composite materials for body implants and to emphasize the significance of polymer composites as a viable alternative to conventional materials used in the biomedical industry for ease of life. This review article explores the developments in functional polymer composites for biomedical applications and provides distinct divisions for their applications based on the part of the body where they are implanted. Each application has been covered in some detail. The various applications covered are bone transplants and bone regeneration, cardiovascular implants (stents), dental implants and restorative materials, neurological and spinal implants, and tendon and ligament replacement.
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Affiliation(s)
| | | | - Kumudinee Marathe
- Department of Chemical Engg, Institute of Chemical Technology, Matunga, Mumbai, Maharashtra, India 400019
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A Pilot Study on Monomer and Bisphenol A (BPA) Release from UDMA-Based and Conventional Indirect Veneering Composites. Polymers (Basel) 2022; 14:polym14214580. [PMID: 36365574 PMCID: PMC9656414 DOI: 10.3390/polym14214580] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 10/24/2022] [Accepted: 10/25/2022] [Indexed: 12/01/2022] Open
Abstract
This study aimed to investigate the release of common monomers from conventional (Dialog Vario, Enamel Plus HFO) and UDMA-based indirect veneering composites (VITA VM LC, GC Gradia). Ten cylindrical samples of each material were prepared (n = 40), immersed in HPLC grade water, and incubated for 24 h in an incubation shaker at 37 °C and 112 rpm. Extraction was performed following ISO 10993-12 and monomers were detected and quantified by HPLC-MS/MS. In all the samples, urethane dimethacrylate (UDMA) and bisphenol A (BPA) were quantifiable. Compared to water blanks, BPA levels were only elevated in the eluates from conventional composites. In all other samples, concentrations were in the range of extraneous BPA and were therefore clinically irrelevant. Low concentrations of Bisphenol A-glycidyl methacrylate (BisGMA) were found in one BPA-free composite and in both conventional materials. Statistical analyses showed that BPA-free materials released significantly less BisGMA and no BPA, while UDMA elution was comparable to elution from conventional materials. All measured concentrations were below reported effective cytotoxic concentrations. Considering these results, the substitution of BPA-derivatives with UDMA might be beneficial since BPA-associated adverse effects are ruled out. Further studies should be enrolled to test the biocompatibility of UDMA on cells of the oral environment.
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Bud MG, Pop RC, Pricope R, Mesaros A, Voina A, Delean A, Lucaciu O, Cîmpean S. Comparative microleakage outcomes of different techniques used for creating the occlusal anatomy in occlusal direct restorations using the dental operating microscope. Clin Exp Dent Res 2022; 8:1623-1629. [PMID: 36229996 PMCID: PMC9760169 DOI: 10.1002/cre2.664] [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: 03/14/2022] [Revised: 07/31/2022] [Accepted: 08/27/2022] [Indexed: 11/07/2022] Open
Abstract
OBJECTIVES Microleakage in direct dental restorations is a primary causal factor in the restoration's failure. The aim of this study was to evaluate whether the technique for occlusal layering of the composite resin (the use of brush adaptation, the use of magnification, cusp build-up, stamp technique) has any effect on microleakage of direct restorations in occlusal cavities. MATERIALS AND METHODS One hundred extracted human molars were restored using five restoration techniques (Packable Bulk technique, Occlusal Stamp technique, Successive Cusp Build-up technique, Successive Cusp Build-up technique + Brush adaptation, Successive Cusp Build-up technique + brush adaptation + Dental Operative Microscope magnification). The teeth were subjected to thermal aging for 800 cycles at 5°C and 55°C, infiltrated with basic fuchsin dye for 24 h, and then sectioned buccolingually in the middle of the crown. Infiltration was measured in four areas of the tooth section by five different observers and then given a score from 1 to 3, proportional to infiltration depth. RESULTS The lowest mean scores for infiltration (meaning less infiltration observed) were present in Group A (1.41 ± 0.878) and Group C (1.46 ± 0.679), while Group D showed the highest infiltration scores (1.75 ± 0.853). When comparing the groups for differences, no statistically significant difference in infiltration was found between any technique p < .586. CONCLUSION The techniques examined for placing the occlusal layer of composite in direct restorations do not differ significantly in terms of marginal infiltration, although a slight improvement was found when using the bulk technique and the successive cusp build-up.
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Affiliation(s)
- Marius G. Bud
- Department of Conservative Odontology, Faculty of Dentistry“Iuliu Hațieganu” University of Medicine and Pharmacy Cluj‐NapocaCluj‐NapocaRomania
| | - Razvan C. Pop
- Department of Conservative Odontology, Faculty of Dentistry“Iuliu Hațieganu” University of Medicine and Pharmacy Cluj‐NapocaCluj‐NapocaRomania
| | - Razvan Pricope
- Department of Conservative Odontology, Faculty of Dentistry“Iuliu Hațieganu” University of Medicine and Pharmacy Cluj‐NapocaCluj‐NapocaRomania
| | - Anca Mesaros
- Department of Prosthodontics and Dental Materials, Faculty of Dentistry“Iuliu Hațieganu” University of Medicine and Pharmacy Cluj‐NapocaCluj‐NapocaRomania
| | - Andrada Voina
- Department of Prosthodontics and Dental Materials, Faculty of Dentistry“Iuliu Hațieganu” University of Medicine and Pharmacy Cluj‐NapocaCluj‐NapocaRomania
| | - Ada Delean
- Department of Conservative Odontology, Faculty of Dentistry“Iuliu Hațieganu” University of Medicine and Pharmacy Cluj‐NapocaCluj‐NapocaRomania
| | - Ondine Lucaciu
- Department of Oral Rehabilitation, Faculty of Dentistry“Iuliu Hațieganu” University of Medicine and Pharmacy Cluj‐NapocaCluj‐NapocaRomania
| | - Sanda Cîmpean
- Department of Conservative Odontology, Faculty of Dentistry“Iuliu Hațieganu” University of Medicine and Pharmacy Cluj‐NapocaCluj‐NapocaRomania
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Zenkner-Neto AW, Vieira-Junior WF, Amaral FL, França FM, Basting RT, Turssi CP. Bulk-fill restorative composites under simulated carious and erosive conditions. ACTA ODONTOLOGICA LATINOAMERICANA : AOL 2022; 35:111-119. [PMID: 36260942 DOI: 10.54589/aol.35/2/111] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/01/2022] [Accepted: 04/01/2022] [Indexed: 06/16/2023]
Abstract
Acidic conditions can cause hydrolysis and accelerate degradation of resin composites (RCs). Since there are limited and controversial data on the effect of acids on bulk-fill RCs, this study assessed the surface roughness (SR) and flexural strength (FS) of these RCs under simulated carious and erosion conditions. Bars of Filtek Bulk Fill (FBF, 3M/ESPE), X-tra fil (XTF, Voco), Tetric N-Ceram Bulk Fill (TBF, Ivoclar/Vivadent), and Aura Bulk Fill (ABF, SDI) and a conventional RC [Filtek Z350XT (FZ, 3M/ESPE)] were allocated (n=15) to undergo caries or erosion conditions. The control group was kept in artificial saliva (AS). The bars were evaluated for SR change (final-baseline) and for three-point FS. Data were analyzed using ANOVA and Tukey's test. At the baseline (p <0.001), the SR of RCs ranked as follows: (TBF = XTF) < FBF (none differed from FZ) < ABF. The interplay between RCs and conditions affected SR change (p = 0.025). While after storage in AS, there was no difference among RCs, following carious and erosive conditions, ABF showed higher SR change. For FS (p <0.001), XTF > (FBF = FZ) > (TBF = FZ) > ABF, with no difference among control, carious and erosive conditions (p = 0.148). Depending on the restorative bulk-fill RCs, carious and erosive conditions roughen the surface but do not affect the FS of these materials.
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Affiliation(s)
- Alfredo W Zenkner-Neto
- Faculdade São Leopoldo Mandic, Divisão de Cariologia e Odontologia Restauradora, Campinas, Brazil
| | - Waldemir F Vieira-Junior
- Faculdade São Leopoldo Mandic, Divisão de Cariologia e Odontologia Restauradora, Campinas, Brazil
| | - Flávia Lb Amaral
- Faculdade São Leopoldo Mandic, Divisão de Cariologia e Odontologia Restauradora, Campinas, Brazil
| | - Fabiana Mg França
- Faculdade São Leopoldo Mandic, Divisão de Cariologia e Odontologia Restauradora, Campinas, Brazil
| | - Roberta T Basting
- Faculdade São Leopoldo Mandic, Divisão de Cariologia e Odontologia Restauradora, Campinas, Brazil
| | - Cecilia P Turssi
- Faculdade São Leopoldo Mandic, Divisão de Cariologia e Odontologia Restauradora, Campinas, Brazil.
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He X, Ye L, He R, He J, Ouyang S, Zhang J. Antibacterial dental resin composites (DRCs) with synthesized bis-quaternary ammonium monomethacrylates as antibacterial agents. J Mech Behav Biomed Mater 2022; 135:105487. [PMID: 36179614 DOI: 10.1016/j.jmbbm.2022.105487] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Revised: 09/20/2022] [Accepted: 09/21/2022] [Indexed: 11/28/2022]
Abstract
Three bi-quaternary ammonium methacrylates (biQAMA-12, biQAMA-14, and biQAMA-16) with different alkyl chain length were synthesized with the purpose of endowing dental resin composites (DRCs) with antibacterial activity without sacrificing physicochemical properties of DRCs. All of biQAMAs were confirmed by 1H-NMR spectra and incorporated into Bis-GMA/TEGDMA (60 wt/40 wt) resin matrix with a mass fraction of 5 wt% as antibacterial agent. The obtained resin matrixes were mixed with commercial silaned glass fillers at a mass ratio of 30 wt/70 wt to prepare antibacterial DRCs. The double bond conversion (DC), antibacterial activity against S. mutans., surface charge density, water contact angle, water sorption (WS) and solubility (SL), mechanical properties, and cytotoxicity of biQAMAs containing DRCs were investigated. The DRC without biQAMAs was used as control. The results showed that all biQAMAs containing DRCs had antibacterial rate higher than 90%, and DRC with biQAMA-12 had the highest antibacterial rate due to its highest surface charge density. Adding 5 wt% of biQAMAs would not bring out negative effect on physicochemical properties of DRCs, except for increasing WS, but the resultant WS still met the ISO requirement on WS of restorative materials. Both biQAMA-14 and biQAMA-16 containing DRCs showed higher cytotoxicity than control, thus biQAMA-12 was considered as the optimal antibacterial agent in this research.
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Affiliation(s)
- Xiaoling He
- Key Laboratory of 3D Printing Technology in Stomatology, The First Dongguan Affiliated Hospital, Guangdong Medical University, Dongguan, 523710, Guangdong, China
| | - Linyan Ye
- Key Laboratory of 3D Printing Technology in Stomatology, The First Dongguan Affiliated Hospital, Guangdong Medical University, Dongguan, 523710, Guangdong, China
| | - Rouye He
- Key Laboratory of 3D Printing Technology in Stomatology, The First Dongguan Affiliated Hospital, Guangdong Medical University, Dongguan, 523710, Guangdong, China
| | - Jingwei He
- College of Materials Science and Engineering, South China University of Technology, Guangzhou, 510641, Guangdong, China.
| | - Suidong Ouyang
- Guangdong Provincial Key Laboratory of Medical Molecular Diagnostics, Guangdong Medical University, Dongguan, 523710, Guangdong, China
| | - Jingying Zhang
- Key Laboratory of 3D Printing Technology in Stomatology, The First Dongguan Affiliated Hospital, Guangdong Medical University, Dongguan, 523710, Guangdong, China.
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Bukhary DM, Al-Zain AO, Alshali RZ, Bukhary DM, Abdalla AN, Youssef AR. Effects of nanohybrid, flowable, resin-based composites on fibroblast viability using different light-curing units. J Prosthodont 2022. [PMID: 36018062 DOI: 10.1111/jopr.13599] [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: 01/13/2022] [Accepted: 08/14/2022] [Indexed: 11/27/2022] Open
Abstract
PURPOSE To investigate the in vitro cytotoxic effects of Bis-GMA-containing and Bis-GMA-free flowable resin-based composites (RBCs) on primary human gingival fibroblast cells (hGFc) using direct and indirect curing methods and three different light-curing units (LCUs) MATERIALS AND METHODS: Cells were isolated and cultured in vitro in 24-well plates. The plates were divided into treatment (cells with RBC), control (cells only), and blank (media only) groups. In the treatment groups, two types of nanohybrid flowable RBCs were used: Bis-GMA-free and Bis-GMA groups. Each treatment group was subdivided according to the curing method, i.e., direct curing (RBC was injected into the wells and cured directly on the attached cells) and indirect curing (the samples were pre-cured outside of the well plate and then added to the well plate with cells). To vary the LCU, the subgroups were further divided into three groups: multiple-emission peak light-emitting diode, single-emission peak light-emitting diode, and quartz-tungsten-halogen units. Curing was conducted for 20 s. The hGFc cytotoxicity was evaluated via 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide (MTT) assay after 24, 48, and 72 h of culturing RESULTS: The MTT assay results showed that both RBCs were significantly cytotoxic toward hGFc compared to the control group (p < 0.0001). The Bis-GMA group was significantly more cytotoxic to the cells compared to the Bis-GMA-free group. In addition, the curing method and time interval affected cell viability regardless of the LCU used CONCLUSION: The Bis-GMA flowable RBC and direct curing method had the highest cytotoxic effects on hGFc regardless of the LCU used. Careful selection of flowable RBCs and proper curing techniques are required to decrease the cytotoxic effects on hGFc and improve the clinical handling of oral tissues. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Dalea M Bukhary
- Oral and Maxillofacial Prosthodontics Department, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Afnan O Al-Zain
- Restorative Dentistry Department, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Ruwaida Z Alshali
- Oral and Maxillofacial Prosthodontics Department, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Deena M Bukhary
- Department of Pharmaceutics, College of Pharmacy, Umm Al-Qura University, Makkah, Saudi Arabia
| | - Ashraf N Abdalla
- Department of Pharmacology and Toxicology, College of Pharmacy, Umm Al-Qura University, Makkah, Saudi Arabia.,Department of Pharmacology and Toxicology, Medicinal and Aromatic plants research institute, National center for research, Khartoum, 2404, Sudan
| | - Abdel-Rahman Youssef
- Division of Basic Medical Science, Department of Basic and Clinical Oral Sciences, Faculty of Dentistry, Umm Al-Qura University, Makkah, Saudi Arabia.,Department of Microbiology and Immunology, Faculty of Medicine, Suez Canal University, Ismailia, Egypt
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Cheng J, Deng Y, Tan Y, Li J, Fei Y, Wang C, Zhang J, Niu C, Fu Q, Lu L. Preparation of Silica Aerogel/Resin Composites and Their Application in Dental Restorative Materials. Molecules 2022; 27:molecules27144414. [PMID: 35889287 PMCID: PMC9323775 DOI: 10.3390/molecules27144414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Revised: 07/07/2022] [Accepted: 07/08/2022] [Indexed: 11/20/2022] Open
Abstract
As the most advanced aerogel material, silica aerogel has had transformative industrial impacts. However, the use of silica aerogel is currently limited to the field of thermal insulation materials, so it is urgent to expand its application into other fields. In this work, silica aerogel/resin composites were successfully prepared by combining silica aerogel with a resin matrix for dental restoration. The applications of this material in the field of dental restoration, as well as its performance, are discussed in depth. It was demonstrated that, when the ratio of the resin matrix Bis-GMA to TEGDMA was 1:1, and the content of silica aerogel with 50 μm particle size was 12.5%, the composite achieved excellent mechanical properties. The flexural strength of the silica aerogel/resin composite reached 62.9546 MPa, which was more than five times that of the pure resin. Due to the presence of the silica aerogel, the composite also demonstrated outstanding antibacterial capabilities, meeting the demand for antimicrobial properties in dental materials. This work successfully investigated the prospect of using commercially available silica aerogels in dental restorative materials; we provide an easy method for using silica aerogels as dental restorative materials, as well as a reference for their application in the field of biomedical materials.
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Pérez‐Mondragón AA, Trejo‐Carbajal N, Cuevas‐Suárez CE, Donado F, Herrera‐González AM. Effect of replacing UDMA by a new tetramethacrylate monomer on the properties of dental resin composite. J Appl Polym Sci 2022. [DOI: 10.1002/app.52707] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Alma Antonia Pérez‐Mondragón
- Laboratorio de Polímeros, Instituto de Ciencias Básicas e Ingeniería Universidad Autónoma del Estado de Hidalgo Pachuca Mexico
| | - Nayely Trejo‐Carbajal
- Laboratorio de Polímeros, Instituto de Ciencias Básicas e Ingeniería Universidad Autónoma del Estado de Hidalgo Pachuca Mexico
| | - Carlos E. Cuevas‐Suárez
- Laboratorio de Biomateriales Dentales, Área Académica de Odontología, Instituto de Ciencias de la Salud Universidad Autónoma del Estado de Hidalgo Pachuca Mexico
| | - Fernando Donado
- Instituto de Ciencias Básicas e Ingeniería Universidad Autónoma del Estado de Hidalgo‐AAMF Pachuca Mexico
| | - Ana M. Herrera‐González
- Laboratorio de Polímeros, Instituto de Ciencias Básicas e Ingeniería Universidad Autónoma del Estado de Hidalgo Pachuca Mexico
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Veček NN, Par M, Sever EK, Miletić I, Krmek SJ. The Effect of a Green Smoothie on Microhardness, Profile Roughness and Color Change of Dental Restorative Materials. Polymers (Basel) 2022; 14:polym14102067. [PMID: 35631949 PMCID: PMC9145769 DOI: 10.3390/polym14102067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Revised: 05/12/2022] [Accepted: 05/17/2022] [Indexed: 11/16/2022] Open
Abstract
Acidic drinks are known to exert negative effects on the surface properties of dental restorative materials. However, the effect of increasingly popular green smoothie drinks has not been addressed so far. The present study investigated the effect of cyclic immersions (5 min daily over 30 days) in a green smoothie drink on the surface properties of contemporary dental restorative materials, including resin composites, an alkasite, and a glass hybrid. Vickers microhardness, profile roughness, and perceptible color change in the CIE L* a* b* color space were evaluated as clinically relevant properties of the material surface. After 30-day green smoothie immersion, microhardness values either decreased by 8–28% (for resin composites) or increased by up to 91% (for glass hybrid). The increase in profile roughness (Ra parameter) of smoothie-immersed specimens was 7–26 times higher compared to the control group. The perceptible color change (ΔE*) in the smoothie group was 3–8 times higher compared to the control group. Overall, this study demonstrated that daily exposure of dental restorations made from resin composites, alkasites, and glass hybrid materials to a green smoothie drink can significantly accelerate material degradation, which is reflected as surface softening, as well as higher roughness and higher perceptible color change.
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Affiliation(s)
| | - Matej Par
- Department of Endodontics and Restorative Dentistry, School of Dental Medicine, University of Zagreb, Gunduliceva 5, 10000 Zagreb, Croatia; (E.K.S.); (I.M.); (S.J.K.)
- Correspondence:
| | - Eva Klarić Sever
- Department of Endodontics and Restorative Dentistry, School of Dental Medicine, University of Zagreb, Gunduliceva 5, 10000 Zagreb, Croatia; (E.K.S.); (I.M.); (S.J.K.)
| | - Ivana Miletić
- Department of Endodontics and Restorative Dentistry, School of Dental Medicine, University of Zagreb, Gunduliceva 5, 10000 Zagreb, Croatia; (E.K.S.); (I.M.); (S.J.K.)
| | - Silvana Jukić Krmek
- Department of Endodontics and Restorative Dentistry, School of Dental Medicine, University of Zagreb, Gunduliceva 5, 10000 Zagreb, Croatia; (E.K.S.); (I.M.); (S.J.K.)
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Ismail HS, Ali AI, Mehesen RE, Juloski J, Garcia-Godoy F, Mahmoud SH. Deep proximal margin rebuilding with direct esthetic restorations: a systematic review of marginal adaptation and bond strength. Restor Dent Endod 2022; 47:e15. [PMID: 35692223 PMCID: PMC9160765 DOI: 10.5395/rde.2022.47.e15] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Revised: 07/25/2021] [Accepted: 08/08/2021] [Indexed: 11/25/2022] Open
Abstract
This review aimed to characterize the effect of direct restorative material types and adhesive protocols on marginal adaptation and the bond strength of the interface between the material and the proximal dentin/cementum. An electronic search of 3 databases (the National Library of Medicine [MEDLINE/PubMed], Scopus, and ScienceDirect) was conducted. Studies were included if they evaluated marginal adaptation or bond strength tests for proximal restorations under the cementoenamel junction. Only 16 studies met the inclusion criteria and were included in this review. These studies presented a high degree of heterogeneity in terms of the materials used and the methodologies and evaluation criteria of each test; therefore, only a descriptive analysis could be conducted. The included studies were individually evaluated for the risk of bias following predetermined criteria. To summarize the results of the included studies, the type of restorative material affected the test results, whereas the use of different adhesive protocols had an insignificant effect on the results. It could be concluded that various categories of resin-based composites could be a suitable choice for clinicians to elevate proximal dentin/cementum margins, rather than the open sandwich technique with resin-modified glass ionomers. Despite challenges in bonding to proximal dentin/cementum margins, different adhesive protocols provided comparable outcomes.
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Affiliation(s)
- Hoda S. Ismail
- Operative Dentistry Department, Faculty of Dentistry, Mansoura University, Egypt
| | - Ashraf I. Ali
- Operative Dentistry Department, Faculty of Dentistry, Mansoura University, Egypt
| | - Rabab El. Mehesen
- Operative Dentistry Department, Faculty of Dentistry, Mansoura University, Egypt
| | - Jelena Juloski
- Clinic for Pediatric and Preventive Dentistry, School of Dental Medicine, University of Belgrade, Serbia
- Department of Medical Biotechnologies, University of Siena, Siena, Italy
| | - Franklin Garcia-Godoy
- Department of Bioscience Research, College of Dentistry, University of Tennessee Health Science Center, Memphis, TN, USA
- The Forsyth Institute, Cambridge, MA, USA
| | - Salah H. Mahmoud
- Operative Dentistry Department, Faculty of Dentistry, Mansoura University, Egypt
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The Influence of Low-Molecular-Weight Monomers (TEGDMA, HDDMA, HEMA) on the Properties of Selected Matrices and Composites Based on Bis-GMA and UDMA. MATERIALS 2022; 15:ma15072649. [PMID: 35407980 PMCID: PMC9000443 DOI: 10.3390/ma15072649] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Revised: 03/29/2022] [Accepted: 03/30/2022] [Indexed: 01/05/2023]
Abstract
Bisphenol A-glycidyl methacrylate (bis-GMA) and urethane dimethacrylate (UDMA) are usually combined with low-viscosity monomers to obtain more desirable viscosity, handling characteristics and general properties. The present study determined the flexural strength (FS), flexural modulus (FM), diametral tensile strength (DTS), and hardness (HV) of five matrices and composites based on these resins. The polymerization shrinkage stress (PSS) was also studied for the composites. The polymer matrices were formed using bis-GMA and UDMA. TEGDMA, HEMA and HDDMA acted as co-monomers. The composites had 45 wt.% of filler content. The highest FS and FM were obtained from the UDMA/bis-GMA/TEGDMA/HEMA matrix and the composite (matrix + filler). The best DTS values were obtained from the UDMA/bis-GMA/HEMA matrix and the composite. One of the lowest values of FS, FM, and DTS was obtained from the UDMA/bis-GMA/HDDMA matrix and the composite. All the composites demonstrated similar hardness values. The lowest polymerization shrinkage stress was observed for the UDMA/bis-GMA/TEGDMA/HEMA composite, and the highest PSS was observed for the UDMA/bis-GMA/TEGDMA/HDDMA composite. The addition of HEMA had a positive effect on the properties of the tested materials, which may be related to the improved mobility of the bis-GMA and UDMA monomers.
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Ismail HS, Morrow BR, Ali AI, Mehesen RE, Garcia-Godoy F, Mahmoud SH. Correlation between different methodologies used to evaluate the marginal adaptation of proximal dentin gingival margins elevated using a glass hybrid. RESTORATIVE DENTISTRY & ENDODONTICS 2022; 47:e36. [DOI: 10.5395/rde.2022.47.e36] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Revised: 05/20/2022] [Accepted: 06/15/2022] [Indexed: 11/11/2022]
Affiliation(s)
- Hoda S. Ismail
- Department of Operative Dentistry Faculty of Dentistry, Mansoura University, Mansoura, Egypt
- Department of Bioscience Research, College of Dentistry, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Brian R. Morrow
- Department of Bioscience Research, College of Dentistry, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Ashraf I. Ali
- Department of Operative Dentistry Faculty of Dentistry, Mansoura University, Mansoura, Egypt
| | - Rabab El. Mehesen
- Department of Operative Dentistry Faculty of Dentistry, Mansoura University, Mansoura, Egypt
| | - Franklin Garcia-Godoy
- Department of Bioscience Research, College of Dentistry, University of Tennessee Health Science Center, Memphis, TN, USA
- Adjunct Faculty, The Forsyth Institute, Cambridge, MA, USA
| | - Salah H. Mahmoud
- Department of Operative Dentistry Faculty of Dentistry, Mansoura University, Mansoura, Egypt
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Monomer Elution from Three Resin Composites at Two Different Time Interval Using High Performance Liquid Chromatography-An In-Vitro Study. Polymers (Basel) 2021; 13:polym13244395. [PMID: 34960944 PMCID: PMC8704455 DOI: 10.3390/polym13244395] [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: 11/08/2021] [Revised: 12/10/2021] [Accepted: 12/12/2021] [Indexed: 01/22/2023] Open
Abstract
Esthetics, improved colour stability and ease of contour have made photo-activated resin based restorative materials being widely used in routine dental clinical practice. Perhaps improper and inadequate polymerization of resin based composite material might lead to elution of monomer. Thus, the aim of the current study was to quantify the monomer elution from three resin composites. The intended analysis was made using high performance liquid chromatography (HPLC) at two different time periods. Three different materials that were investigated in the current study included Swiss Tech resin composite (Group A), Ceram X (Group B) and Beautifil Injectable composite (Group C). Ten cylindrical samples were fabricated in each study group. In 75% wt of ethanol, the samples were ingressed immediately and stored at room temperature. A 0.5 mL of the samples was assessed at pre-defined time intervals at 24 h and 7th day. Later, assessment of the samples was performed with HPLC and the data was analyzed using statistical test. Bisphenol A-glycidyl methacrylate (Bis-GMA), Triethylene glycol dimethacrylate (TEGDMA), 2-hydroxyethyl methacrylate (HEMA) and Urethane dimethacrylate (UDMA) were quantified in the samples. When analyzing the release monomer, it was found that at the end of 24 h Bis-GMA was eluted more in the injectable resin composite whereas, TEGDMA was eluted from Swiss Tech and Ceram X resin composites. At the end of the 7th day it was evident that Bis-GMA was eluted maximum in all the three resin composites. Thus, monomer release was found to be evident among all three resin composites and it is of utmost important to be assessed in routine clinical practice.
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Evaluation of the Behavior of Two CAD/CAM Fiber-Reinforced Composite Dental Materials by Immersion Tests. MATERIALS 2021; 14:ma14237185. [PMID: 34885342 PMCID: PMC8658643 DOI: 10.3390/ma14237185] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Revised: 11/20/2021] [Accepted: 11/22/2021] [Indexed: 01/15/2023]
Abstract
Fiber-reinforced composites are used as restorative materials for prosthetic oral rehabilitation. Gastroesophageal reflux disease (GERD) is an accustomed affection with various oral manifestations. This study aimed to evaluate the behavior of two high-performance CAD/CAM milled reinforced composites (Trinia™, TriLor) in artificial saliva at different pH levels through immersion tests, and to determine if changes in mass or surface morphology at variable pH, specific for patients affected by GERD, appear. After investigating the elemental composition and surface morphology, the specimens were immersed in Carter Brugirard artificial saliva for 21 days at different pH values (5.7, 7.6, and varying the pH from 5.7 to 3). The values of the weighed masses during the immersion tests were statistically processed in terms of mean and standard deviation. Results suggested that irrespective of the medium pH, the two composites presented a similar mass variation in the range of −0.18 (±0.01)–1.82 (±0.02) mg after immersion, suggesting their stability when in contact with artificial saliva, an aspect which was also highlighted by scanning electron microscope (SEM) analysis performed on the immersed surfaces. Novel composite biomaterials can be a proper alternative for metal alloys used for prosthetic frameworks in patients suffering from GERD.
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A Contemporary Evaluation on Posterior Direct Restoration Teaching among Undergraduates in Dental Schools in Malaysia. Dent J (Basel) 2021; 9:dj9100123. [PMID: 34677185 PMCID: PMC8534716 DOI: 10.3390/dj9100123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 10/05/2021] [Accepted: 10/08/2021] [Indexed: 11/22/2022] Open
Abstract
There is a current trend to restore posterior teeth with composite resin due to increasing demands on natural tooth colour restoration and increased concern about the safety of amalgam restorations. The objective was to evaluate the current teaching of posterior direct restoration among restorative dental lecturers in Malaysia compared to available international literature. An online questionnaire, which sought information on the teaching of posterior restoration was developed and distributed to 13 dental schools in Malaysia. The response rate for the questionnaire was 53.8%. The most popular posterior restoration teaching methods among the respondents were lecture (95.7%), demonstration (87.0%) and problem-based learning (PBL) (73.9%), while continuous assessment and a practical competency test (82.6%) were the most popular assessment methods. Placing a hard setting calcium hydroxide and GIC base for deep cavity restored by composite restoration was taught in 79.2% of cases. The standard protocols for posterior composite restoration were incremental filling in deep cavity (87.5%), using circumferential metal bands with wooden wedge (91.7%), with a total etch system (95.8%), using a light emitting diode (LED) light curing unit (91.7%), finishing using water cooling (80%) and finishing with a disc (87.5%). Graduates from dental schools in Malaysia received similar theoretical, preclinical and clinical teaching on posterior restoration techniques, although there were variations in the delivery methods, techniques and assessments, pointing to a need for uniformity and consensus.
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Niu H, Yang DL, Gao T, Wang JX. Efficient prediction of the packing density of inorganic fillers in dental resin composites for excellent properties. Dent Mater 2021; 37:1806-1818. [PMID: 34565583 DOI: 10.1016/j.dental.2021.09.010] [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: 05/31/2021] [Revised: 09/13/2021] [Accepted: 09/13/2021] [Indexed: 10/20/2022]
Abstract
OBJECTIVE The purpose of this study is to develop a mathematical model for efficient prediction of the packing density of different filler formulations in dental resin composites (DRCs), and to study properties of DRCs at the maximum filler loading (MFL), thereby providing an effective guidance for the design of filler formulations in DRCs to obtain excellent properties. METHODS The packing density data generated by discrete element model (DEM) simulation were used to re-derive the parameters of 3-parameter model. The modifier effect was also induced to modify the 3-parameter model. DRCs with 10 filler formulations were selected to test properties at the MFL. The packing densities of binary and ternary mixes in DRCs were calculated by 3-parameter model to explore the regularity of composite packing. RESULTS The predicted packing density was validated by simulation and experimental results, and the prediction error is within 1.40 vol%. The optimization of filler compositions to obtain a higher packing density is beneficial to enhancing the mechanical properties and reducing the polymerization shrinkage of DRCs. In binary mixes, the maximum packing density occurs when the volume fraction of small fillers is 0.35-0.45, and becomes higher with the reduction of particle size ratio. In ternary mixes, the packing density can reach the maximum value when the volume fractions of large and small fillers are in the 0.5-0.75 and 0.15-0.4 ranges, respectively. SIGNIFICANCE The modified 3-parameter model can provide an effective method to design the multi-level filler formulations of DRCs, thereby improving the performance of the materials.
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Affiliation(s)
- Hao Niu
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, China; Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Dan-Lei Yang
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, China; Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Tianyu Gao
- School of Automation, China University of Geosciences, Wuhan 430074, China
| | - Jie-Xin Wang
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, China; Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing, 100029, China.
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Iqbal A, Khattak O, Fayyaz A, Issrani R, Alrasheed OS, Almandel MN, Alruwaili AQ. Choice of Restorative Materials for Direct Posterior Restorations among Undergraduate Saudi College Students. Open Dent J 2021. [DOI: 10.2174/1874210602115010439] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Background:
The most common restorative materials used in dentistry are amalgam and composite. Amalgam is a controversial material owing to its mercury toxicity. With recent advances in the properties of composite materials, there has been a shift towards its use.
Objectives:
The aim of this study was to understand the perceptions of undergraduate dental students in a northern Saudi Arabian dental school about the choice of restorative materials for restoring posterior teeth.
Methodology:
The study included undergraduate students studying in 4th and 5th year dental program in College of Dentistry, Jouf University. A four-item questionnaire with 18 close-ended questions was developed by the investigators, which were hand delivered to all the students. Data analysis is presented through tables and descriptive methods.
Results:
A total of 98 (out of 131) undergraduate students participated in this study. Overall, the students reported a significantly strong influence of the type of restorative materials in relation to the cavity size and margin of the restorations along with the esthetics factor(p<0.05). There was slight influence on the student’s choice because of the instructor's influence, whereas the students felt they were knowledgeable and had appropriate training to use either amalgam or composite. The study also found that patient’s preference had a strong influence on choosing composite material. The students were mostly not influenced while choosing the material as far as the safety of it was concerned. However, the patient’s influence was slight when it came to the choice of the material. A significant difference was noted among the students when it came to pregnancy-related safety concerns where the choice of material was not influenced by either amalgam or composite (p=.002).
Conclusion:
The undergraduate dental students at College of Dentistry, Jouf University are comfortable in using both amalgam and composite as a posterior restorative material. They are knowledgeable about both the materials and are adequately trained to use either one.
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Li B, Tian L, Pan L, Li J. Molecular dynamics investigation of structural and mechanical properties of silica nanorod reinforced dental resin composites. J Mech Behav Biomed Mater 2021; 124:104830. [PMID: 34530300 DOI: 10.1016/j.jmbbm.2021.104830] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Revised: 09/02/2021] [Accepted: 09/07/2021] [Indexed: 10/20/2022]
Abstract
In this work, molecular dynamics simulations are conducted to investigate the structural and mechanical properties of dental materials, i.e., the silica nanorod reinforced Bis-GMA/TEGDMA resin composite. The effects of loading content and size of the silica nanorods on the composite stiffness were performed by examining resin chain conformation, hydrogen bonds and matrix/filler binding energy. It is revealed that the presence of the silica nanorod causes polymer chain expansion, endowing the resins with higher stiffness. Moreover, the volumetric hydrogen bonds and binding energy increase considerably with the loading content, but decrease gradually with the diameter or show almost independence of the length. Furthermore, the composite moduli were quantified by the micromechanics models and the transverse moduli were well predicted by the Counto model, signifying a perfect bonding between the matrix and nanorod. The chain expansion and energetic matrix/filler interactions are believed to contribute to the significant mechanical reinforcement of the composites with the loading content. However, the length of the nanorod has a little effect on the composite moduli due to the unaltered interfacial interaction. In contrast, a smaller diameter is supposed to give a larger modulus, and this is not observed in this work due to the synergic effects of improved matrix/filler interaction and actual reduced filler volume fraction. The mechanical enhancement by the rod-like structures is more influenced by the loading content, but less so by the size of the nanorod, and it also exhibits superior mechanical performance as compared to nanoparticles. The findings thus extend the current understanding of the nanostructure and mechanical properties of silica nanorod reinforced dental resin composites from an atomic/molecular perspective.
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Affiliation(s)
- Bei Li
- School of Materials Science and Engineering, Research Center for Materials Genome Engineering, Wuhan University of Technology, Wuhan, 430070, China; State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan, 430074, China.
| | - Lili Tian
- School of Materials Science and Engineering, Research Center for Materials Genome Engineering, Wuhan University of Technology, Wuhan, 430070, China
| | - Lei Pan
- School of Materials Science and Engineering, Research Center for Materials Genome Engineering, Wuhan University of Technology, Wuhan, 430070, China
| | - Jianjun Li
- State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan, 430074, China
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Martins ARM, Silva ID, Machado‐Santos L, Vitti RP, Sinhoreti MAC, Brandt WC. Isobornyl methacrylate as diluent co‐monomer on physical‐mechanical properties of dental resin composites. J Appl Polym Sci 2021. [DOI: 10.1002/app.50498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Aurealice Rosa Maria Martins
- Department of Restorative Dentistry, Piracicaba Dental School University of Campinas Piracicaba São Paulo Brazil
| | - Isaias Donizeti Silva
- School of Dentistry, Implantology Area Santo Amaro University São Paulo São Paulo Brazil
| | - Luciana Machado‐Santos
- Department of Prosthodontics, School of Dentistry University of Taubaté Taubaté São Paulo Brazil
| | - Rafael Pino Vitti
- School of Dentistry Herminio Ometto University Center Araras São Paulo Brazil
| | | | - William Cunha Brandt
- School of Dentistry, Implantology Area Santo Amaro University São Paulo São Paulo Brazil
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