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: 1141
PDF: 227
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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.

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


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