Evaluation of success rate and biomechanical stability of ultraviolet-photofunctionalized miniscrews with short lengths

Sung Hwan Choi, Jiuk Shin, Jae Kook Cha, Jae Sung Kwon, Jung Yul Cha, Chung Ju Hwang

Research output: Contribution to journalArticlepeer-review

Abstract

Introduction: The aim of this research was to verify that ultraviolet light (UV)–photofunctionalization improves the success rate and biomechanical stability of miniscrews regardless of length, and to evaluate the comparability of biomechanical stability between UV-photofunctionalized miniscrews with short lengths and untreated miniscrews with conventional lengths. Methods: Eight male beagles (age, 12-15 months; weight, 10-13 kg) received a total of 64 miniscrews, including 7-mm and 4-mm untreated and UV-photofunctionalized, acid-etched miniscrews with the use of a random block design. The cumulative success rates were examined in all studied groups. The insertion and removal torques and screw mobility were measured. Microcomputed tomographic scans and histomorphometric analyses were performed at 8 weeks postoperatively. Results: The success rates of 7-mm UV-untreated and UV-photofunctionalized miniscrews were 87.5% and 100%, respectively, vs 43.8% for the 4-mm UV-untreated and 4-mm UV-photofunctionalized miniscrews. The rates were significantly different in accordance with the length (P <0.001). There were no differences in the insertion and removal torque and screw mobility between groups according to the length or UV treatment. However, the 4-mm UV-untreated miniscrews yielded a mean bone area ratio of 6.35 ± 7.43%, whereas the 7-mm UV-photofunctionalized miniscrew yielded a mean ratio of 32.17 ± 8.34% (P = 0.037). Conclusions: The UV-photofunctionalization significantly increased the biomechanical stability and led to increased bone and miniscrew contact area in dogs with miniscrews of the same length. However, the most important factor that affected the success rate of the miniscrew was the length.

Original languageEnglish
Pages (from-to)158-166
Number of pages9
JournalAmerican Journal of Orthodontics and Dentofacial Orthopedics
Volume159
Issue number2
DOIs
Publication statusPublished - 2021 Feb

Bibliographical note

Funding Information:
This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) and funded by the Ministry of Science, ICT & Future Planning ( NRF–2018R1C1B6000989 ) and Yonsei University College of Dentistry (6-2018-0011).

Publisher Copyright:
© 2020 American Association of Orthodontists

All Science Journal Classification (ASJC) codes

  • Orthodontics

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