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Evaluation of cyclic fatigue resistance of different rotary endodontic file systems

Published in Ektodermal Displazi Grubu - Türkiye
2020
Volume: 13
   
Issue: 3
Pages: 849 - 853
Abstract

Aim of the present study was to compare the cyclic rotations needed to fracture four different rotary nickel titanium endodontic instruments. Four different endodontic Nickel Titanium rotary systems were selected for this study: OneShape, OneCurve, ProTaper Next and HyFlex EDM of ISO size 25, 25 mm instrument length and 0.06 instrument taper. All were exposed to cyclic fatigue tests in a custom-made simulated canal having 60° curvature. Cyclic fatigue was calculated for each rotary system by calculating the time needed to fracture the instrument in seconds while being rotated in a steel block curved canal. Data was statistically analyzed by calculating the mean time to fracture the instrument in seconds, standard deviation, one way ANOVA and t-test at 5% level of significance. HyFlex EDM instruments had the highest cyclic fatigue resistance among all the other instruments being tested. One-way ANOVA test revealed that there was a statistically significant difference between all the four groups being tested (P ≤ 0.05). Further analysis of the data was done using t-test, also indicated that there was statistically significant differences (P ≤ 0.05) between all the pairs of groups being tested individually. Cyclic flexural fatigue resistance was observed highest for Group IV (HyFlex EDM) and lowest for Group I (One Shape). HyFlex CM files had the exceptional lengthiest survival time while files from One Shape showed limited survival. We obtained the clinical significance from this in- vitro study: showing their exceptionalism in resistance and prolonged survival time. Proving their superiority in resistance and longer survival time, HyFlex CM rotary NiTi files can be used in curved root canals and eventually will be helpful in eradicating one of the factors for file fracture clinically during root canal treatment i.e., cyclic fatigue- where root canal exhibits a sharp bend or curve.

About the journal
JournalJournal of International Dental and Medical Research
PublisherEktodermal Displazi Grubu - Türkiye
ISSN1309-100X
Open AccessYes