Effect of erosive challenge and Nd:YAG laser irradiation on bond strength of adhesive systems to dentin |
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| Affiliation: | 1. Department of Biomaterials and Oral Biology, School of Dentistry, University of São Paulo, Av. Prof. Lineu Prestes, 2227, 05508-000 São Paulo, SP, Brazil;2. Department of Orthodontics and Pediatric Dentistry, University of São Paulo, Av. Prof. Lineu Prestes, 2227, São Paulo, SP, Brazil;3. Special Laboratory of Lasers in Dentistry (LELO), Department of Restorative Dentistry, University of São Paulo, Av. Prof. Lineu Prestes, 2227, São Paulo, SP, Brazil;1. Department of Biomaterials and Oral Biology, School of Dentistry, University of São Paulo (USP), São Paulo, Brazil;2. Discipline of Dental Materials, School of Dentistry, University Nove de Julho (UNINOVE), São Paulo, Brazil;3. Discipline of Restorative Dentistry, School of Dentistry, University of Passo Fundo (UPF), Passo Fundo, Brazil;4. Department of Oral Biology, Bauru School of Dentistry, University of São Paulo (USP), Bauru, Brazil;5. Biomaterials and Biotechnology in Health Programs, Anhanguera University of São Paulo (UNIAN), São Paulo, Brazil;6. Department of Oral Biology, College of Dental Medicine, Georgia Health Sciences University, Augusta, USA;1. Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603 Malaysia;2. Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843, USA;1. Department of Biomaterials Science, School of Dentistry, Dankook University, Cheonan 330-714, South Korea;2. Institute of Tissue Regeneration Engineering (ITREN), Dankook University, Cheonan 330-714, South Korea;3. Department of Nanobiomedical Science & BK21 PLUS NBM Global Research Center for Regenerative Medicine Research Center, Dankook University, Cheonan 330-714, South Korea;1. Department of Engineering Mechanics, Dalian University of Technology, Dalian, China;2. School of Automotive Engineering, Dalian University of Technology, Dalian, China;3. State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Dalian University of Technology, Dalian, China;4. State Grid Puyang Power Supply Company, Puyang, China;1. Department of Restorative Dentistry, College of Dentistry, University of Illinois at Chicago, 801 South Paulina Street, Room 531, Chicago, IL, USA;2. Department of Restorative Dentistry, Passo Fundo Dental School, University of Passo Fundo, UPF, Passo Fundo, RS, Brazil |
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| Abstract: | PurposeTo evaluate the effect of Nd:YAG laser irradiation and erosive challenge on bond strength of two adhesive systems to dentin.MethodsTwenty bovine incisors were cut and grounded to obtain eighty slabs of flat dentin. Specimens were allocated into eight groups, based on: adhesive system—a two-step etch-and-rinse and a two-step self-etch; laser irradiation—Nd:YAG (1 W/10 Hz) or control (no laser irradiation); and erosive challenge after restorative procedure—presence or absence of erosive challenge. Nd:YAG laser groups were submitted to laser irradiation before the restorative procedure. Blocks of composite resin were built up on the bonded surfaces with a Southern Dental Industries device to perform shear bond strength (SBS) test. After, each specimen of erosive challenge, groups were subjected to immersion in Sprite Zero® (20 ml/2 h/24 °C/under agitation). The SBS test (0.5 mm/min) was performed after 24 h of water storage at 37 °C. Failure mode was evaluated with a stereomicroscope (X400). Data were analyzed with three-way ANOVA and Tukey’s post hoc tests (α=0.05).ResultsThe etch-and-rinse adhesive system presented higher bond strength values than self-etch adhesive. Laser irradiation increased the bond strengths values when erosive challenge was present. The predominant failure mode observed was adhesive.ConclusionsThe irradiation of Nd:YAG laser positively influences the bond strength values when erosive challenges are present. Moreover, the etch-and-rinse adhesive system is a better option to be used in dentin in this clinical condition. |
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| Keywords: | Self-etch adhesive Total-etch Dentine Macro-shear Dental erosion |
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