Shaping ability of three nickel-titanium rotary instruments in simulated L-shaped canals: OneShape, Hero Shaper, and Revo-S

Abstract Background Shaping ability of a file plays an important role during instrumentation in endodontic treatment. This study aimed to compare the shaping OneShape (OS), Hero Shaper (HS), and Revo-S (RS) instruments simulated L-shaped canals. Methods Forty-eight canals were prepared apical size 25 using OS, HS, RS (all from Micro-Mega SA, Besançon, France), (n = 16 canals/group) systems. The amount resin removed after each canal's preparation was measured compared producing composite image made superimposition pre post-instrumented Canal aberrations time also recorded. data statistically analysed by ANOVA, Tukey, Chi-square tests. Results One fractured group. A significant difference found at end canal between groups, with showing least removal inner side HS highest outer ( P < 0.05). Regarding total width preparation, groups straight portion canals, No differences different regarding aberrations' incidence > Conclusions All files showed tendency straighten whereas OS maintained original curvatures well.