A laboratory study analysis of the cyclic fatigue strength of glide path instruments at simulated body temperature

Submitted: 7 June 2022
Accepted: 14 September 2022
Published: 27 September 2022
Abstract Views: 1224
PDF: 265
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Aim: This study aimed to evaluate the cyclic flexural fatigue resistance of four glide path files (one rotary and three reciprocating) by using a simulated root canal model.

Method: 25-mm-length files (n=10) (ProGlider, Dentsply Maillefer; X1-Glide Path, MK Life; WaveOne Gold Glider, Dentsply Maillefer; and R-Pilot, VDW) were mounted in a 6:1 reduction handpiece powered by a torque-controlled motor and introduced into a 1.4-mm-diameter and 19-mm-length stainless steel tube (9-mm-length curved segment with an 86-degree curvature angle. The files were worked under irrigation with 37 °C distilled water until visual and/or audible observation of fracture. The time to each file fracture was measured with aid of a digital stopwatch. X1-Glide Path, WaveOne Gold Glider, and R-Pilot files were subjected to reciprocating motion while ProGlider files were subjected to continuous 300-rpm clockwise rotation. The surface morphology of two specimens per group was observed under scanning electron microscopy before and after fatigue testing. The file types were compared using one-way ANOVA and posthoc Tukey (p<0.05). The Weibull analysis was used to determine the expected lifespan of the files.

Results: The mean time to file fracture was found significantly different among file types (p<0.001): X1-Glide Path (455.32 sec) > R-Pilot (315.13 sec) > WaveOne Gold Glider (235.65 sec) > ProGlider files (158.30 sec). The Weibull analysis confirmed that ProGlider and X1-Glide Path files are associated with the shortest and the longest mean time to failure, respectively.

Conclusion: X1-Glide Path files showed significantly higher cyclic flexural fatigue resistance than other file types.

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Fontana, C. E., Bonfante, L. ., Rosa, Y. M. ., Mendonça de Moura, J. D., Pelegrine, R. A. ., Pedro Rocha, D. G. ., Sigrist De Martin, A. ., Pinheiro, S. L., & da Silveira Bueno, C. E. (2022). A laboratory study analysis of the cyclic fatigue strength of glide path instruments at simulated body temperature. Giornale Italiano Di Endodonzia, 36(2). https://doi.org/10.32067/GIE.2022.36.02.08