Artículos de revistas
Influence Of Thermomechanical Fatigue On Bond Strength Of Repaired Composites
Registro en:
Influence Of Thermomechanical Fatigue On Bond Strength Of Repaired Composites. Elsevier Sci Ltd, v. 61, p. 65-70 SEP-2015.
0143-7496
WOS:000358457600007
10.1016/j.ijadhadh.2015.05.005
Autor
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
Institución
Resumen
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) 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. (C) 2015 Elsevier Ltd. All rights reserved. 61
65 70 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) FAPESP [2012/09397-8]