Avaliação in vitro da microdureza e porosidade de duas resinas compostas fotopolimerizáveis.

Abstract

In vitro evaluation of microhardness and porosity of two light-curing composite resins. Scientific studies on the physical and mechanical properties of Composite Resins are increasingly needed in view of the wide variety of products available in the market today, resulting from the increase of its demand within the dentistry that prizes for minimally invasive preparations with the return of the aesthetic and functional characteristic aspects of the dental element. This in vitro working study aims to evaluate, in a comparative way, the microhardness and porosity of two photopolymerizable composite resins previously selected: Filtek Z350 XT from 3M and Zirconfill from Technw. Ten specimens per sample (n=10) have been built and submitted to Vickers microhardness and porosity tests by computerized microtomography. About the presence of porosities, given in percentage, the Filtek group had the lowest mean values. When comparing statistically, the groups showed a statistical difference (p=0.019), with a magnitude of high effect. Regarding the microhardness values, the Filtek group had the highest average values. When comparing statistically, the groups do not presented statistical difference (p>0.05). It was concluded that the porosity was significantly different between the studied groups, being the group Filtek Z350XT of smaller percentage. However, the groups showed no statistical difference for microhardness, although the Filtek Z350XT group presented higher average values.