Comportamento de desgaste de resinas compostas e seus antagonistas

Abstract

Composite resin is a restorative material well known for having good optical as well as mechanical properties. The objective of this work is to characterize the wear behavior of a conventional composite resin (RC) and a bulk fill resin (BF), and their antagonist teeth, in an oral environment simulation test. Eight specimens (PCs) of each composite resin (2 mm thick) were made on a substrate analogous to dentin. As antagonists, 16 healthy human upper premolars were prepared. The wear test was carried out in a pneumatic mechanical cycling machine, with a load of 49 N, frequency of 2 Hz, in water at 37º C for 100,000 cycles (n=8). Images of the wear surface of the composite resin PCs were obtained and the facets were measured with ImageJ software. The teeth were scanned before and after the micro-CT wear test. The volume of tooth wear was evaluated using Geomagic Wrap software. For the results, no statistical difference was found for the length and width (mm) of the wear facets between the experimental groups (p>0.05), nor for the volume (mm3) of wear on the antagonist teeth (p>0 .05). Therefore, as a conclusion of the study, the wear behavior was similar for both composite resins, as well as their antagonists, after a simulated test of the oral environment.