Clinical fracture incidence of rotary and reciprocating NiTi files: A systematic review and meta?regression

This systematic review was registered in PROSPERO (CRD42017075917) and aimed to investigate whether the available clinical evidence supports hypothesis that reciprocating motion results a lower incidence of nickel-titanium files fracture compared continuous rotation. Clinical studies reported engine-driven were included. The main exposure kinematics, primary outcome fracture. overall 2.27%, with trend for higher rotary (2.43%) than (1.0%), though without significant differences. Multiple meta-regression models revealed use more four teeth less proficient operators associated file There no difference instruments between motions; however, other factors identified.