EFFECT OF MMT NANOPARTICLE CLAY ON FLEXURAL PROPERTIES OF POLYMER BASED BisGMA/TEGDMA RESIN

摘要

The objective of this study is to evaluate the (strength and modulus) and degree of conversion of dimethacrylate resin containing different amounts of Montomorillonite (MMT) Cloisite 20A nanoclay as filler. Eight formulations of polymer based BisGMA/TEGDMA (four with MMT and another four with barium glass (BG) as filler) at concentration of 20, 30, 40 and 50% by weight were studied. As control, a series of composites containing BG particles were also tested. The flexural strength data was analyzed using Kruskal-Wallis and Tukey's tests. The addition of MMT nanoparticles in a BisGMA / TEGDMA resin matrix resulted in similar degree of conversion and higher elastic modulus values compared to the groups filled with BG. The decrease in the resistance value with increasing concentration of MMT may be due to the formation of agglomerates (clusters) that decreases the reinforcement efficiency.