Retratamento de obtura es com o sistema Thermafill por meio do sistema ProFile .04 em 350 ou 2.000 rpm

This study aimed at determining the quality of removal of the thermafill system in endodontic retreatment with utilization of the 0.04 ProFile system at two different speeds. Thirty single-rooted mandibular canines were divided into two groups. The canals were prepared with the crown-down technique and obturated with the thermafill system with a carrier #40 and Ah-plus sealer.Fillings were removed two weeks after obturation, as follows: Group I –0.04 ProFile following the size sequence 90, 60, 45, 40 and 45, without solvent, at a speed of 350rpm; Group II – same technique at 2000rpm. The specimens were longitudinally sectioned and were scanned and analyzed by a software(ImageTool) that measured the area of remaining filling material and removal of the plastic carrier. The mean of remnants of filling material was 24.86% at Group I, 24.91% at Group II and the area was not statistically different(Student’s “t” test) between the two groups and all plastic carriers were removed. It was concluded that the quality of removal of the filling material at both speeds (350 or 2000rpm) was similar; and all plastic carriers were removed with success by ProFile .04 system.