Retreatment of Thermafill fillings with the ProFile .04 system at 350 or 2000rpm

Resumo

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.