Cyclic Fatigue Resistance and Fractographic Analysis of Race and Protaper Rotary NiTi Instruments.

Introduction: This study investigated the fatigue and fracture modes of RaCe and ProTaper rotary instruments.

Materials And Methods: Fatigue resistance was evaluated by rotating the files 30° or 60° and with 2 or 5mm radius of curvature. RaCe taper 06 size 25 and ProTaper F1 files (n=40) were used.