Cyclic fatigue resistance of three reciprocating nickel-titanium instruments with heat treatment at intrachannel temperature

Introduction: the in vitro study compared dynamic cyclic fatigue resistance of 3 reciprocating NiTi files with heat treatment. Methods: we distributed 30 new endodontic three groups. The selected for this experiment were: AF Blue R3 25/06 (AFB) (Fanta Dental, Shanghai, China), X1 File (X1B) (MK Life, Porto Alegre, RS, Brazil), and Reciproc 08/25 (RB) (VDW, Munich, Germany. We measured time to file fractureand length fractured fragment. ANOVA analysis was used, followed by Tukey test multiple comparisons, a significance level 5% (P < 0.05). Results: mean seconds until 170.7 ±15.1 AFB files, 110.4 ±26.8 X1B, 163.3 ±22.9 RB files. This difference statistically significant when comparing X1B (p: 0.000) 0.000). However, there are no differences between (p:0.739). Conclussions: found that exhibit similar fatigue.