Resumen
PURPOSE: To evaluate the quality of marginal and internal adaptation of Filtek Silorane composite in standardized class 1 cavities before and after thermo-mechanical loading using different application protocols of the Silorane System Adhesive (SSA). METHODS: Five groups (n = 10) of class 1 cavities were restored with Filtek Silorane using different SSA applications. Total bonding (TB): Group A (SSA), Group B (SSA without primer polymerization), Group C (enamel etching + SSA), Group D (enamel etching + SSA without primer polymerization) and Selective bonding (SB): Group E. Marginal adaptation was assessed on replicas in the SEM at x200 magnification before and after thermomechanical loading (3,000 x 5-55 degrees C, 1.2.10(6) x 49N; 1.7Hz) under simulated dentin fluid. After loading, the samples were sectioned and the internal adaptation was evaluated as well. RESULTS: The lowest scores of percentCM (Continuous Margin) before/after thermo-mechanical loading being 80.8 (+/- 8.2) / 32.1 (+/- 8.3) were observed in the control group A. Enamel phosphoric acid etching prior to the application of the SSA resulted in significantly higher percentCM before and after loading in comparison with the 'non-etched' groups (P > 0.05). When enamel etching was performed before the application of the adhesive system, no statistically significant differences (P > 0.05) were observed regardless of how the SSA was applied (total vs. selective bonding). Internal adaptation was negatively influenced by omitting the SSA-primer polymerization (P > 0.05). (AU)
