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Comparison of cyclic fatigue resistance of novel nickel‐titanium rotary instruments
Authors:Ismail Davut Capar DDS  PhD  Huseyin Ertas DDS  PhD  Hakan Arslan DDS  PhD
Affiliation:1. Department of Endodontics, Faculty of Dentistry, ?zmir Katip ?elebi University, ?zmir, Turkey;2. Department of Endodontics, Faculty of Dentistry, Atatürk University, Erzurum, Turkey
Abstract:New files (ProTaper Next/HyFlex/OneShape) are made from novel nickel‐titanium (NiTi) alloys/treatments. The purpose of this study was to compare the cyclic fatigue resistance of these new instruments with that of Revo‐S instruments. Four groups of 20 NiTi endodontic instruments were tested in steel canals with a 3 mm radius and a 60° angle of curvature. The cyclic fatigue of the following NiTi instruments with a tip size 25 and 0.06 taper that were manufactured with different alloys was tested: ProTaper Next X2 (M‐Wire), OneShape (conventional NiTi), Revo‐S Shaping Universal (conventional NiTi) and HyFlex 25/0.6 (controlled memory NiTi wire). A one‐way anova and post‐hoc Tukey's test (α = 0.05) revealed that the HyFlex files had the highest fatigue resistance and the Revo‐S had the least fatigue resistance among the groups (P < 0.001).
Keywords:cyclic fatigue  heat treatment  nickel‐titanium files  ProTaper Next  rotary
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