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The Effects of Diameter, Length and Insertion Method on the Stability of Orthodontic Miniscrew

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Abstract

Purpose

This study investigated the maximum insertion torque value (ITV) of different dimensions of orthodontic miniscrews for primary stability, and further explored the effects of continuous rotation insertion and intermittent rotation insertion methods on the stability of orthodontic miniscrews.

Methods

Six different dimensions of orthodontic miniscrews, three lengths (6.0, 8.0, and 10.0 mm) and two diameters (1.4 and 1.6 mm), were inserted into the artificial bone specimens by using a torque testing machine, and continuous and intermittent rotation insertion methods were applied. There were a total of 12 groups, and each group was composed of five samples. The torque testing machine was used to record the maximum ITV and torque-time curve.

Results

The median maximum ITV of the orthodontic miniscrews in the 12 groups ranged between 11.5 and 23.7 N cm. In orthodontic miniscrews of 1.6 mm diameter, regardless of the insertion method, the ITV increased with length. For orthodontic miniscrews of 1.4 mm diameter, there was no statistical difference in the maximum ITV regardless of the inserted method as the differences in length were negligible (only 2.0 mm). Furthermore, there was no statistical difference in the maximum ITV required for the continuous rotation insertion and intermittent rotation insertion methods between inserting orthodontic miniscrews of similar dimensions.

Conclusion

The maximum ITV mostly increased with the increase in the diameter or length of the orthodontic miniscrew. There was no statistical difference in the maximum ITV required for continuous rotation and intermittent rotation insertion methods.

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Data Availability

The data sets used and analyzed during the current study are available from the corresponding author upon reasonable request.

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Funding

This research was supported by China Medical University and Hospital, Taichung City, Taiwan (Grant Number: 10771709) and China Medical University, Taichung City, Taiwan (CMU110-MF-95).

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Authors and Affiliations

  1. Department of Radiation Oncology, Taichung Veterans General Hospital, Taichung, 407, Taiwan

    Wan-Ping Yu

  2. Master Program for Biomedical Engineering, China Medical University, Taichung, 404, Taiwan

    Wan-Ping Yu

  3. School of Dentistry, College of Dentistry, China Medical University, Taichung, 404, Taiwan

    Jian-Hong Yu, Shiuan-Hui Wang & Jui-Ting Hsu

  4. Department of Dentistry, China Medical University Hospital, Taichung, 404, Taiwan

    Jian-Hong Yu

  5. Department of Biomedical Engineering, College of Biomedical Engineering, China Medical University, Taichung, 404, Taiwan

    Jui-Ting Hsu

  6. Department of Bioinformatics and Medical Engineering, Asia University, Taichung, 413, Taiwan

    Jui-Ting Hsu

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  1. Wan-Ping Yu
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Correspondence to Jui-Ting Hsu.

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Yu, WP., Yu, JH., Wang, SH. et al. The Effects of Diameter, Length and Insertion Method on the Stability of Orthodontic Miniscrew. J. Med. Biol. Eng. 42, 508–515 (2022). https://doi.org/10.1007/s40846-022-00737-0

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  • DOI: https://doi.org/10.1007/s40846-022-00737-0

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