Efeito do clareamento do consultório sobre a sorção de um compósito de baixa contração

Abstract

The aim of the present study was to evaluate the influence of dental bleaching on the salivary sorption of a low shrinkage dental composite based on silorane monomer (FiltekTM P90, 3M ESPE, EUA) in relation to a methacrylate-based composite (FiltekTM Z250, 3M ESPE, EUA). Ten specimens of each material were fabricated in sectioned customized metaçlic mold ( 5mm x h 1mm). The composites were photo activated with a LED unit (1.400mW/cm²). All specimens were immersed in artificial saliva for 1 month and half of them was weekly submitted to an in -office bleaching protocol (BP) with 35% hydrogen peroxide (Whitegold, Dentsply Brasil). So, four groups (n=5) were analyzed: (G1) Z250 with BP; (G2) Z250 with BP; (G3) P90 no BP; and G(4) P90 with BP. the measurements of sorption behavior were made by weighing in anaaytical balance, according to ISO 4049/2000. Data were analyzed by 2-factor ANOVA and Student-Newman -Keuls post-hoc test (p=0.05). The sorption behavior was: G2> G4> G1> G3, and medium (p = 0.1584) did not show significant influence on the sorption's values. It was concluded that the bleaching treatment did not affect the values of sorption of the composites evaluated ande there was no difference in sorption behavior between different composites in both media tested.