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Çilingir A, Dulger K. Microleakage Evaluation of Expired and Non-expired Resin Composites and Bonding Agents: In Vitro Study. JOURNAL OF ADVANCED ORAL RESEARCH 2022. [DOI: 10.1177/23202068221079205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Aim: Although the shelf life is a key property of dental composites and bonding agents, these materials may often be used in simple procedures after expiration. In this study, the microleakage of two year expired and non-expired dental composites (Filtek Ultimate Universal A2 Enamel, 3M ESPE, USA, and Tetric N Ceram A2, Ivoclar Vivadent, Schaan, Liechtenstein) and a universal bonding system (Single Bond Universal, 3M ESPE, USA) was examined. Materials and Methods: In 40 freshly extracted human molars, two standardized Class II cavities (buccolingual and mesiodistal width of 3 mm and 4 mm, respectively) were prepared (80 cavity preparations). The teeth were thermocycled in distilled water for 1000 cycles in a 5°C to 55°C water bath. Next, the teeth and their apical foramens were coated with water resistant nail varnish, except for 1 mm around the restoration–tooth interface, and retained in a 1% methylene blue solution. After 24 h, the specimens were cut into two halves and analyzed using a stereomicroscope. Scanning electron microscopy images of two samples of the groups were obtained. Results: The Kruskal–Wallis test indicated no significant differences between the groups ( P < .05). The occlusal median scores were not significant ( P = .99). Moreover, the gingival median scores were not significant ( P = .48). No difference was found between the occlusal and gingival values in any group ( P > .05). Conclusion: These findings indicated that two-year-expired dental composites and bonding agent, which were maintained under proper conditions, do not have any significant difference in terms of the microleakage.
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Affiliation(s)
- Aylin Çilingir
- Department of Restorative Dentistry, Faculty of Dentistry, Trakya University, Edirne, Turkey
| | - Kıvanç Dulger
- Department of Restorative Dentistry, Faculty of Dentistry, Karadeniz Technical University, Trabzon, Turkey
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Münchow EA, da Silva AF, Piva E, Cuevas-Suárez CE, de Albuquerque MTP, Pinal R, Gregory RL, Breschi L, Bottino MC. Development of an antibacterial and anti-metalloproteinase dental adhesive for long-lasting resin composite restorations. J Mater Chem B 2020; 8:10797-10811. [PMID: 33169763 PMCID: PMC7744429 DOI: 10.1039/d0tb02058c] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Despite all the advances in adhesive dentistry, dental bonds are still fragile due to degradation events that start during application of adhesive agents and the inherent hydrolysis of resin-dentin bonds. Here, we combined two outstanding processing methods (electrospinning and cryomilling) to obtain bioactive (antimicrobial and anti-metalloproteinase) fiber-based fillers containing a potent matrix metalloproteinase (MMP) inhibitor (doxycycline, DOX). Poly(ε)caprolactone solutions containing different DOX amounts (0, 5, 25, and 50 wt%) were processed via electrospinning, resulting in non-toxic submicron fibers with antimicrobial activity against Streptococcus mutans and Lactobacillus. The fibers were embedded in a resin blend, light-cured, and cryomilled for the preparation of fiber-containing fillers, which were investigated with antibacterial and in situ gelatin zymography analyzes. The fillers containing 0, 25, and 50 wt% DOX-releasing fibers were added to aliquots of a two-step, etch-and-rinse dental adhesive system. Mechanical strength, hardness, degree of conversion (DC), water sorption and solubility, bond strength to dentin, and nanoleakage analyses were performed to characterize the physico-mechanical, biological, and bonding properties of the modified adhesives. Statistical analyses (ANOVA; Kruskal-Wallis) were used when appropriate to analyze the data (α = 0.05). DOX-releasing fibers were successfully obtained, showing proper morphological architecture, cytocompatibility, drug release ability, slow degradation profile, and antibacterial activity. Reduced metalloproteinases (MMP-2 and MMP-9) activity was observed only for the DOX-containing fillers, which have also demonstrated antibacterial properties against tested bacteria. Adhesive resins modified with DOX-containing fillers demonstrated greater DC and similar mechanical properties as compared to the fiber-free adhesive (unfilled control). Concerning bonding performance to dentin, the experimental adhesives showed similar immediate bond strengths to the control. After 12 months of water storage, the fiber-modified adhesives (except the group consisting of 50 wt% DOX-loaded fillers) demonstrated stable bonds to dentin. Nanoleakage was similar among all groups investigated. DOX-releasing fibers showed promising application in developing novel dentin adhesives with potential therapeutic properties and MMP inhibition ability; antibacterial activity against relevant oral pathogens, without jeopardizing the physico-mechanical characteristics; and bonding performance of the adhesive.
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Affiliation(s)
- Eliseu A. Münchow
- Department of Conservative Dentistry, School of Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, RS 90035-003, Brazil
| | - Adriana F. da Silva
- Graduate Program in Dentistry, Federal University of Pelotas, Pelotas, RS 96015-560, Brazil
| | - Evandro Piva
- Graduate Program in Dentistry, Federal University of Pelotas, Pelotas, RS 96015-560, Brazil
| | - Carlos E. Cuevas-Suárez
- Dental Materials Laboratory, Academic Area of Dentistry, Autonomous University of Hidalgo State, Circuito Ex Hacienda La Concepción S/N, San Agustín Tlaxiaca, Hgo, 42160 Mexico
| | - Maria T. P. de Albuquerque
- Department of Clinical Dentistry, Endodontics, Federal University of Bahia, Salvador, BA 40110-040, Brazil
| | - Rodolfo Pinal
- Department of Industrial and Physical Pharmacy, Purdue University, College of Pharmacy, West Lafayette, IN 47907, USA
| | - Richard L. Gregory
- Department of Biomedical and Applied Sciences, Division of Dental Biomaterials, Indiana University School of Dentistry (IUSD), Indianapolis, IN 46202, USA
| | - Lorenzo Breschi
- Department of Biomedical and Neuromotor Sciences, DIBINEM, University of Bologna, Alma Mater Studiorum, Bologna, Italy
| | - Marco C. Bottino
- Department of Cariology, Restorative Sciences, and Endodontics, University of Michigan School of Dentistry, Ann Arbor, MI 48109, USA
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Cuevas-Suárez CE, Ramos TS, Rodrigues SB, Collares FM, Zanchi CH, Lund RG, da Silva AF, Piva E. Impact of shelf-life simulation on bonding performance of universal adhesive systems. Dent Mater 2019; 35:e204-e219. [PMID: 31227184 DOI: 10.1016/j.dental.2019.05.023] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2019] [Revised: 04/25/2019] [Accepted: 05/30/2019] [Indexed: 10/26/2022]
Abstract
OBJECTIVES To evaluate the micro-tensile bond strength to dentin (μTBS), the degree of conversion (DC) and nanoleakage expression (NL) of eight dental adhesives considering their expiry date (as-received, half-life and or end of shelf-life) after shelf-life simulation. METHODS Five universal adhesives (Single Bond Universal, SBU; Tetric Bond Universal, TBU; OneCoat Universal, OCU; OptiBond Universal, OBU; and Prime&Bond Elect, P&B), two two-step self-etch adhesives (Clearfil SE, CSE; and AdheSE, ASE) and one two-step etch-and-rinse adhesive (Adper Singlebond 2, ASB) were evaluated. Shelf-life was simulated by storing the materials in an acclimatization chamber for different periods of time. The μTBS was tested in accordance with ISO/TS 11,405. DC was evaluated by means of FTIR spectroscopy. NL was evaluated after ammoniacal silver challenge. The significance level of α=0.05 was used for all statistical analyses. RESULTS The μTBS to dentin of TBU, P&B, ASE, and ASB adhesive systems remained stable throughout the shelf-life periods evaluated, while for SBU, OCU, OBU, and CSE, decreased significantly after evaluation in the 'half-life' or 'end of shelf-life' condition (p<0.05). Except for P&B, ASE and OBU, the degree of conversion significantly decreased after the shelf-life simulation (p<0.05). OCU, ASE, and CSE showed significantly increased percentage of silver deposition within the adhesive layer (p<0.05). SIGNIFICANCE Storing conditions and progressively longer storage time affect the performance of universal adhesives systems.
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Affiliation(s)
- Carlos Enrique Cuevas-Suárez
- Dental Materials Laboratory, Academic Area of Dentistry, Autonomous University of Hidalgo State, Circuito Ex Hacienda La Concepción S/N, San Agustín Tlaxiaca, Hgo, 42160 Mexico; Department of Restorative Dentistry, School of Dentistry, Federal University of Pelotas. Gonçalves Cháves 457, Pelotas, RS 96015-560, Brazil.
| | - Tatiana S Ramos
- Biomaterials Development and Control Center (CDC-Bio), Federal University of Pelotas, Gonçalves Cháves 457, Pelotas, RS 96015-560, Brazil.
| | - Stéfani Becker Rodrigues
- Dental Materials Laboratory, School of Dentistry, Federal University of Rio Grande do Sul, Ramiro Barcelos 2492, Porto Alegre, RS 90035-004, Brazil.
| | - Fabricio Mezzomo Collares
- Dental Materials Laboratory, School of Dentistry, Federal University of Rio Grande do Sul, Ramiro Barcelos 2492, Porto Alegre, RS 90035-004, Brazil.
| | - Cesar Henrique Zanchi
- Department of Restorative Dentistry, School of Dentistry, Federal University of Pelotas. Gonçalves Cháves 457, Pelotas, RS 96015-560, Brazil.
| | - Rafael Guerra Lund
- Department of Restorative Dentistry, School of Dentistry, Federal University of Pelotas. Gonçalves Cháves 457, Pelotas, RS 96015-560, Brazil.
| | - Adriana Fernandes da Silva
- Department of Restorative Dentistry, School of Dentistry, Federal University of Pelotas. Gonçalves Cháves 457, Pelotas, RS 96015-560, Brazil.
| | - Evandro Piva
- Department of Restorative Dentistry, School of Dentistry, Federal University of Pelotas. Gonçalves Cháves 457, Pelotas, RS 96015-560, Brazil.
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El Gezawi M, Haridy R, Abo Elazm E, Al-Harbi F, Zouch M, Kaisarly D. Microtensile bond strength, 4-point bending and nanoleakage of resin-dentin interfaces: Effects of two matrix metalloproteinase inhibitors. J Mech Behav Biomed Mater 2017; 78:206-213. [PMID: 29172125 DOI: 10.1016/j.jmbbm.2017.11.024] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Revised: 11/11/2017] [Accepted: 11/16/2017] [Indexed: 02/09/2023]
Abstract
Chronic degradation of hybrid layer collagen by matrix metalloproteinases (MMPs) jeopardizes resin-dentin interfacial integrity and limits the durability of dental restorations. The 4-point bending strength (BS) is a valid but uncommon method of testing the mechanical behavior of resin-dentin interfaces. The present study aims to analyze the influence of two matrix metalloproteinase inhibitors on microtensile bond strength (µTBS), BS and nanoleakage. A total of 48M were divided into three groups according to bonding procedure. Teeth were horizontally sectioned to produce a flat dentin surface. In the control group, etch-and-rinse Prime&Bond One (Dentsply) bonding was used; in the self-etch group, methacryloyloxydodecylpyridinium bromide (MDPB)-containing Clearfil SE Protect (Kuraray) was used; and in the benzalkonium chloride (BAC)-etch group, BAC-etchant (Bisco) was used. A Ceram.X-One (Dentsply) composite was built as three successive layers and was light-cured. Samples were sectioned to produce microrods that were randomly divided into two groups for analysis at baseline and after 6 months of water immersion (n = 32), plus one slab for nanoleakage analysis (n = 8) via scanning electron microscopy (SEM) and digital image analysis (Fiji). Data were analyzed using the Weibull distribution and a mixed-model ANOVA with a post hoc Tukey test. All groups showed deterioration of the initial bonds. The self-etch group had a worse baseline µTBS than the control but had the best BS after aging. BAC-etch did not improve bond stability of etch-and-rinse adhesive. The µTBS and BS test results after aging were moderately correlated. Mixed fractures prevailed with regard to µTBS, whereas adhesive fractures dominated with regard to BS. Nanoleakage was not eliminated in any group and increased after aging. MDPB self-etch resisted bond degradation better than etch-and-rinse adhesives, even after BAC-etching. Integrating BS in studies of µTBS and nanoleakage might provide more clinically relevant outcomes for predicting the performance of dental adhesives.
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Affiliation(s)
- Moataz El Gezawi
- Department of Restorative Dental Science, Imam Abdulrahman bin Faisal University, Dammam, Saudi Arabia
| | - Rasha Haridy
- Department of Conservative Dentistry, Faculty Oral and Dental Medicine, Cairo University, Egypt; Department of Clinical Dental Sciences, Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia
| | - Emad Abo Elazm
- Department of Restorative Dentistry, Suez Canal University, Egypt
| | - Fahad Al-Harbi
- Department of Substitutive Dental Sciences, Imam Abdulrahman bin Faisal University, Saudi Arabia
| | - Mariem Zouch
- Department of Mathematics, Imam Abdulrahman bin Faisal University, Saudi Arabia
| | - Dalia Kaisarly
- Department of Conservative Dentistry and Periodontology, University Hospital, LMU Munich, Goethestrasse 70, 80336 Munich, Germany; Biomaterials Department, Faculty of Oral and Dental Medicine, Cairo University, Cairo, Egypt.
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