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Influence of surface treatments on the flexural strength of denture base repair
Authors:Pereira Rodrigo de Paula  Delfino Carina Sinclér  Butignon Luis Eduardo  Vaz Marcos André Kalabaide  Arioli-Filho João Neudenir
Institution:1. Department of Dental Materials and Prosthodontics, Araraquara Dental School, UNESP – S?o Paulo State University, Araraquara, SP, Brazil;2. Department of Restorative Dentistry, School of Dentistry, Cruzeiro do Sul University – UNICSUL, S?o Paulo, SP, Brazil;3. Department of Restorative Dentistry, School of Dentistry, Federal University of Parana – UFPR, Curitiba, PR, Brazil
Abstract:doi: 10.1111/j.1741‐2358.2011.00454.x Influence of surface treatments on the flexural strength of denture base repair Objective: The purpose of this study was to evaluate the flexural strength of repairs made with autopolymerising acrylic resin after different treatments of joint surfaces. Material and Methods: Fifty rectangular specimens were made with heat‐polymerised acrylic resin and 40 were repaired with autopolymerising acrylic resin following joint surface treatments: group 1 (intact specimens), group 2 (chemical treatment: wetting with methyl‐methacrylate for 180 s), group 3 (abraded with silicon carbide paper), group 4 (abraded and wetting with methyl‐methacrylate for 180 s) and group 5 (without surface treatment). The flexural strength was measured by a three‐point bending test using a universal testing machine with a 100 Kgf load cell in the centre of repair at 5 mm/min cross‐head speed. All data were analysed using one‐way anova and Tukey HSD test for multiple comparisons (p < 0.05). Results: Among repaired specimens, groups 2 and 4 had 66.53 ± 3.4 and 69.38 ± 1.8 MPa mean values and were similar. These groups had superior flexural strength than groups 3 and 5 that were similar and had 54.11 ± 3.4 and 51.24 ± 2.8 MPa mean values, respectively. Group 1 had a mean value of 108.30 ± 2.8 MPa being the highest result. Conclusion: It can be concluded that the treatment of the joint surfaces with methyl‐methacrylate increases the flexural strength of denture base repairs, although the strength is still lower than that observed for the intact denture base resin. Abrasion with sandpaper was not able to influence the flexural strength of repaired denture bases.
Keywords:acrylic resin  repair  flexural strength  heat‐polymerised acrylic resin  autopolymerising acrylic resin
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