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Static cyclic fatigue resistance evaluation of neoniti rotary files at different insertion angles [Turk Endod J]
Turk Endod J. Ahead of Print: TEJ-48030 | DOI: 10.14744/TEJ.2021.48030

Static cyclic fatigue resistance evaluation of neoniti rotary files at different insertion angles

Afzal Ali1, Nihat Umut Gözen2, Abdurrahman Kerim Kul2, Aasima Ishaq1, Vivek Vadera3
1Department of Conservative Dentistry And Endodontics, Pacific Dental College And Hospital, Rajasthan, India
2Department of Endodontics, Faculty Of Dentistry, Istanbul Health Sciences University, Istanbul, Turkey
3Department of Conservative Dentistry and Endodontics, Darshan Dental College and Hospital, Rajasthan, India

Context:
Different insertion angles of the rotary files during the canal shaping may influence the cyclic fatigue resistance (CFR). The aim of the present study is to evaluate the effect of different insertion angles on file’s static cyclic fatigue resistance at body temperature.

Methods and Material:
25 mm long Eighty new Neoniti (Neolix, Châtres-la-Forêt, France) files were used. The stainless-steel metal block was designed with four artificial canals having different insertion angles (0°, 10°, 20°, and 30°). The files were subjected to static cyclic fatigue procedure at simulated body temperature (35 ± 1 °C). The number of cycles to failure (NCF) were recorded.
Results:
Kruskal Wallis H test was performed to analyze the data at 95% confidence interval (P=.05). For #20.06 and #25.06 instrument, the 10°, 20° and 30° insertion angles resulted in decreased static fatigue resistance as compared to straight (0°) insertion angle (P <.05).
Conclusions:
When the insertion angle increases, the static cyclic fatigue resistance (CFR) decreases. An inclined insertion into the canals decreases the cyclic fatigue resistance of the endodontic instruments.

Keywords: Cyclic Fatigue, insertion angle, Neoniti



Corresponding Author: Afzal Ali, India
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