Comparative Evaluation of Buckling Resistance of Pathfinder Files: an in Vitro Study.

Abstract

Aim: In this study, buckling resistance of D finder files, Mani K-files, Dontics K-files, M access K-files, Micromega K-files and C+ files were evaluated.

Methods: Using universal testing machine, the test endodontic files were exposed to an axially directed increasing load and the highest load that brings about an elastic displacement of 1mm in lateral direction was noted.

Results: The results show buckling resistance in decreasing order: C+ file > Micromega K file > M access K file > D finder > Dontics K file > Mani K file.

Conclusions: C+ files required the maximum load to buckle and has the highest buckling resistance than the other endodontic instruments used in this study.Taking into consideration that the buckling resistance is an important mechanical property of an endodontic instrument used for canal negotiation, C+ files showed significantly better results than the other instruments tested.

Clinical significance: Canal negotiation is the first and most important step in root canal instrumentation which provides intrinsic details about the canal complexities. The small endodontic files used for this purpose often buckle and becomes less potent to reach the apical end. Therefore, buckling resistance is an important mechanical property of an endodontic instrument used for canal negotiation ensuring success.