OLIVEIRA, N. M. S.; http://lattes.cnpq.br/4719570729563692; OLIVEIRA, Nadja Maria da Silva.
Resumo:
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.