Effectiveness of ProFile .04 Taper rotary instruments in endodontic retreatment

This study investigated the retreatment effectiveness of .04 Taper nickel-t itanium rotary Profiles, Thirty extracted single-rooted anterior teeth were instrumented and obturated with gutta-percha/Roth's Sealer using lateral c ondensation. They were distributed into three groups of 10 each. Retreatmen t for group A was done using Profile alone, group B using Profile and chlor oform, and group C using hand flies with chloroform. The teeth were then sp lit longitudinally into halves, The remaining gutta-percha/sealer on the ro ot canal wall in the cervical, middle, apical thirds, and the whole canals were visually scored with the aid of light microscopes, The results showed that the mean scores in groups A and B were generally lower (better) than g roup C, Mean scores of the apical thirds tended to be higher (worse) than t he middle and the cervical thirds, except in group A. Profile with or witho ut chloroform seemed to be a viable alternative retreatment method.