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|Title:||Influence of thermomechanical fatigue on bond strength of repaired composites|
|Author:||da Silva, Bruno Rodrigues|
Silva Sousa, Ana Beatriz
Ramos Salles de Oliveira, Dayane Carvalho
Martins Giamatei Contente, Marta Maria
Alandia-Roman, Carla Cecilia
Coelho Sinhoreti, Mario Alexandre
Panzeri Pires-de-Souza, Fernanda de Carvalho
|Abstract:||Objective: The aim of this study was to evaluate the influence of thermomechanical fatigue (TMF) and two adhesive systems on bond strength (BS) of repaired nanofilled composite. Materials and Methods: A hundred test specimens (8 mm diameter x 8 mm thickness) were obtained (Filtek Z350, 3M ESPE, St. Paul, MN, USA) and separated in 10 groups (n=10), according to the type of adhesive system for repair and TMF, after and before repair. Control groups: G1 - without repair and TMF (control); G2 - without repair+TMF. Groups repaired with total-etch adhesive system (ASB - Adper Scotchbond Multi-Purpose, 3M ESPE): G3 - repaired without TMF; G4 - TMF before repair; G5 - TMF after repair; G6 - TMF before and after repair. Groups repaired with self-etch adhesive system (CLB - Clearfil Liner bond 2V, Kuraray Dental): G7 - repaired without TMF; G8 -TMF before repair; G9 - TMF after repair; G10 - TMF before and after repair. After treatments, sticks (1 mm(2)) were obtained and submitted to the microtensile test (0.5 mm/mm). Failure modes were observed in Scanning Electron Microscopy (SEM-Jeol JSM 5600LV). Results: Statistical analysis (2-way ANOVA, Tukey, p <0.05) demonstrated that G2 presented highest BS values that differed statistically compared with those of other repaired groups submitted to TMF (p <0.05). Regarding control groups, G2 presented the highest BS values, different from Cl (p=0.0087). Fractographic analysis demonstrated that all repaired groups showed predominantly adhesive failures regardless of the adhesive system used. Conclusions: The TMF can improve the BS of repaired composites mainly when used self-etch adhesive, which demonstrated higher BS. The timing of TMF influences the BS of the repair on composite|
|Appears in Collections:||FOP - Artigos e Outros Documentos|
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