Comparação do desgaste da zona de perigo de molares superiores utilizando o sistema rotatório ProTaper e brocas Gates-Glidden

Abstract

The aim of this study was to evaluate the thickness of the distal wall ofdentin mesio buccal roots of maxillary molars (risk zone) when subjected to the action of Gates Glidden drills (GG) or ProTaper for process instrumentation of root canals. For this we selected 20 molars, which after being included in a block of polyester resin were sectioned in the area between the cervical third and middle third (risk zone). The specimens were photographed before and after operative process with a Nikon Coolpix 4300 digital camera attached to the surgical microscope (DFVasconcelos). Ten samples were performed in the instrumentationchannels mesiobuccal by Gates Glidden drills (GG) and other ten-university channels mésios instrumented by rotary system ProTaper. After phase instrumentation blocks were photographed again. The shortest distance found between the inner wall of the channel and the outer wall on the risk area was measured using the Image TOOL before and after the use of drills. Data were tabulated and taken for statistical analysis. It was concluded that there was no statistically significant difference in wear caused by both instruments in all sectors analyzed.