Preparação de nanohíbridos polímero/argila para aplicações odontológicas.

Abstract

The objective of the work was to prepare dental nanohybrids to be competitive with dental resins commercial nanoparticulates. Thus, a silicate in layers, the organoclay Cloisite 20A (C20A), Southern Clay Products, it was incorporated to a dental resin microhybrid Z100 (3M/ESPE) and structural, morphologic and dimensional properties of the nanohybrids obtained evaluated as function of the incorporation method and the filler content employed. Three dispersion methods were studied to evaluate the most efficient to distribute the filler C20A into the dental composite Z100. The nanohybrids prepared in this study were characterized by x-ray diffraction (DRX), electronic scanning microscopy (MEV), three bending test points, microhardness Vickers, infrared spectroscopy (IV) and thermogravimetry (TG). The obtained results suggest that the incorporation of 1.7 and 3.0% organofilic Cloisite C20A clay in dental microhybrid Z100 resin resulted in the formation of nanohybrids with intercalated morphology. The mechanical properties of the commercial microhybrid have been improved. The microhybrid morphology has been modified with the incorporation of nanoclay, decreasing the presence of clusters and improving the particle size distribution. Based on the results of this study, it becomes evident that it is possible to prepare dental nanohybrids from a commercial resin microhybrid (Z100) with mechanical properties similar to commercial resin nanoparticulates Filtek Supreme XT(3M/ESPE) using a simple method of preparation that is viable either clinically or economically.