Effect of Cross-sectional Designs on Torsional Resistance of Endodontic Nickel-Titanium Files: A Finite Element Study.

Objectives:  This study aimed to assess the influence of two key design parameters on the torsional resistance of endodontic rotary files: the ratio of the equivalent radius ( ) to the polar moment of inertia (), or / ratio, and the percentage of the inner core area. Understanding these factors can guide the development of files with improved performance during root canal procedures.

Materials And Methods:  Finite element analysis was employed to simulate the behavior of rotary files under torsional loading conditions.