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Screw-in force, torque generation, and performance of glide-path files with three rotation kinetics

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Abstract

We aimed to evaluate the screw-in force, torque generation, and performance of three nickel-titanium (NiTi) glide-path files with different rotational kinetics. ProTaper Ultimate Slider (PULS) and HyFlex EDM Glide-path (HEDG) files were used for canal shaping with constant rotation (CON) or the alternative rotation technique (ART). In the ART mode, the NiTi file was periodically rotated at a speed of 1.5 times faster than that in the CON mode. WaveOne Gold Glider was used with reciprocating motion (WOGG_RCP). Sixty J-shaped resin blocks were assigned to five groups: PULS_CON, PULS_ART, HEDG_CON, HEDG_ART, and WOGG_RCP (n = 12). Glide-path preparation was performed using an automated pecking device. During glide-path preparation, the screw-in force and clockwise and counterclockwise torques were recorded and the number of pecking motions required to reach the working length was determined. The centering ratio was calculated after glide-path preparation using stereomicroscopic images. Data were analyzed using one-way analysis of variance with the Games–Howell post hoc test and the Kruskal–Wallis test with Bonferroni correction. PULS_ART generated a lower maximum screw-in force than PULS_CON. The average number of pecking motions required to reach the working length by HEDG_ART was lower than that by HEDG_CON. The mean centering ratios of PULS_CON and HEDG_CON were − 0.04 and − 0.06, respectively, while those of PULS_ART, HEDG_ART, and WOGG_RCP were 0.09, 0.01, and 0.08, respectively. The ART mode reduced the screw-in force of PULS and enabled faster glide-path preparation with the HEDG file.

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Data availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgements

This study was supported by a grant from the National Research Foundation of the Republic of Korea (NRF-2021R1G1A1006751).

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Authors and Affiliations

  1. Department of Conservative Dentistry, Graduate School, Kyung Hee University, 23 Kyungheedae-Ro, Dongdaemun-Gu, Seoul, 02447, Republic of Korea

    Jee-Yeon Woo

  2. Department of Conservative Dentistry, Kyung Hee University Dental Hospital, 23 Kyungheedae-Ro, Dongdaemun-Gu, Seoul, 02447, Republic of Korea

    Jee-Yeon Woo, Ji-Hyun Jang, Seok Woo Chang & Soram Oh

  3. Department of Conservative Dentistry, College of Dentistry, Kyung Hee University, 23 Kyungheedae-Ro, Dongdaemun-Gu, Seoul, 02447, Republic of Korea

    Ji-Hyun Jang, Seok Woo Chang & Soram Oh

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Woo, JY., Jang, JH., Chang, S.W. et al. Screw-in force, torque generation, and performance of glide-path files with three rotation kinetics. Odontology (2023). https://doi.org/10.1007/s10266-023-00879-w

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