“…It was also observed in this study that deformations did not lead to fracture; so, if torque, rotational speed and operator experience are controlled, incidence of fracture could be greatly minimized. On the other hand, the ENDOflash instruments had no macroscopic evidence of deformation, unlike manual Flexofiles (Martin & Blaskovic‐Subat 1997, Schäfer 2001, Schäfer & Lohmann 2002, Schäfer & Florek 2003), suggesting the efficacy of controlling torque as the files are subjected to a stress never exceeding a level which would induce threading effects.…”