Resinas Compostas: Avaliação da Contracção e Profundidade de Polimerização em Função da Matriz Orgânica

Abstract

ObjectivesEvaluation of the polymerization shrinkage and depth of cure of two composite resins, with different organic matrix. MethodsTwo composite resins were used in this study, the Filtek™Silorane with a silorane resin matrix and the Filtek™P60 with a methacrylate resin matrix. The polymerization shrinkage was determined through the measurement of the density in accordance with the Archimedes principle and the statistical evaluation with the “t student” parametric test to the difference of the expected values (p>0,05). The depth of cure was calculated through the micrometric measurement of the samples, according to the standard ISO4049:2000 (E). In both studies there were used the light curing units LED (Light Emitting Diodes) and QTH (Quartz Tungsten Halogen). ResultsIt was verified a statistical evidence of which the resin composite Filtek™Silorane reaches values of polymerization shrinkage inferiors [1,14% (QTH) and 1,18% (LED)] being also the values of depth of cure inferior [(1,74mm (QTH) and 1,99mm (LED)], comparatively with the composite resin FiltekTMP60 [2,33% (QTH) and 2,42% (LED)] and [2,45mm (QTH) and 2,85mm (LED)]. ConclusionsThe properties of polymerization shrinkage and depth of cure are dependent variables of factors like the type of resin matrix, the content and type of filler and the light curing unit used. The composite resin Filtek™Silorane reported lower polymerization shrinkage and depth of cure compared with the composite resin Filtek™P60.