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Histomorphometric evaluation of the bone surrounding orthodontic miniscrews according to their adjacent root proximity

Authors
 Hyun-Ju Oh  ;  Jung-Yul Cha  ;  Hyung-Seog Yu  ;  Chung-Ju Hwang 
Citation
 Korean Journal of Orthodontics (대한치과교정학회지), Vol.48(5) : 283-291, 2018 
Journal Title
 Korean Journal of Orthodontics (대한치과교정학회지) 
ISSN
 1225-5610 
Issue Date
2018
Keywords
Bone–implant contact ; Bundle bone ; Miniscrew ; Root proximity
Abstract
Objective: This study was conducted to perform histomorphometric evaluations of the bone surrounding orthodontic miniscrews according to their proximity to the adjacent tooth roots in the posterior mandible of beagle dogs. Methods: Four male beagle dogs were used for this study. Six orthodontic miniscrews were placed in the interradicular spaces in the posterior mandible of each dog (n = 24). The implanted miniscrews were classified into no loading, immediate loading, and delayed loading groups according to the loading time. At 6 weeks after screw placement, the animals were sacrificed, and tissue blocks including the miniscrews were harvested for histological examinations. After analysis of the histological sections, the miniscrews were categorized into three additional groups according to the root proximity: high root proximity, low root proximity, and safe distance groups. Differences in the bone-implant contact (BIC, %) among the root proximity groups and loading time groups were determined using statistical analyses. Results: No BIC was observed within the bundle bone invaded by the miniscrew threads. Narrowing of the periodontal ligament space was observed in cases where the miniscrew threads touched the bundle bone. BIC (%) was significantly lower in the high root proximity group than in the low root proximity and safe distance groups. However, BIC (%) showed no significant differences among the loading time groups. Conclusions: Regardless of the loading time, the stability of an orthodontic miniscrew is decreased if it is in contact with the bundle bone as well as the adjacent tooth root.
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/163495
Files in This Item:
T201802934.pdf Download
DOI
10.4041/kjod.2018.48.5.283
Appears in Collections:
1. Journal Papers (연구논문) > 2. College of Dentistry (치과대학) > Dept. of Orthodontics (교정과학교실)
Yonsei Authors
유형석(Yu, Hyung Seog)
차정열(Cha, Jung Yul)
황충주(Hwang, Chung Ju)
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