Effect of Glide Path Preparation on Subsequent Centering Ability of Two Rotary Systems

Abstract

Introduction: The aim of this study was to compare the effect of root canal preflaring using manual file and PathFile on root canal shaping of ProTaper and Mtwo rotary systems.

Materials and Methods: One hundred curved Endo training blocks were selected and randomly based on type of preflaring and flaring instruments, divided in to four groups. Group 1: Preflaring with PathFile and flaring with ProTaper, Group 2: PathFile + Mtwo, group 3: manual K file + ProTaper and group 4: Manual K file + Mtwo. Preinstrumentation, preflaring and flaring images were superimposed to evaluate the increase of canal width. Intra and inter group comparisons were carried out by Man-Whitney and Kruskal-Wallis tests.

Results: In preflaring step, PathFile better than hand K files preserved canal centricity (P<0/05).In comparison of group 1 (PathFile+ProTaper) with 3 (hand K-file+ProTaper) and group 2 (PathFile+Mtwo) with 4 (hand K-file+Mtwo) in order to diversion of main path, there was no significant difference between them (P>0.05), but in comparison of four groups, preparation with ProTaper (group 1 and 3) significantly (P<0.05) increased the deviation of original canal shape than Mtwo (group 2 and 4).

Conclusion: Deviation of root canal is greater subsequent to use of ProTaper rotary files than Mtwo files without respect to the preflaring method.