Assessment of the Shaping Ability of R-Motion 30 .04 and 25 .06 in Mesial Canals of Mandibular Molars Based on Automated Computational Measurement.

Introduction: The aim of this study was to evaluate changes in geometry following root canal preparation using R-Motion instruments with different apical sizes and tapers.

Methods: Fifty-four mesial canals of mandibular molars with single curvature of angles ranging between 20° and 30° were stratified into 3 groups according to their internal anatomy (R-Motion 25/.06, 30/.