Effect of bite force on orthodontic mini-implants in the molar region: Finite element analysis
이현정, 이경숙, 김민지, 전윤식,
소속 상세정보
이현정 ( Lee Hyeon-Jung ) - Chonnam National University School of Dentistry Department of Orthodontics
이경숙 ( Lee Kyung-Sook ) - Ewha Womans University Graduate School of Clinical Dentistry Department of Orthodontics
김민지 ( Kim Min-Ji ) - Ewha Womans University Graduate School of Clinical Dentistry Department of Orthodontics
전윤식 ( Chun Youn-Sic ) - Ewha Womans University Graduate School of Clinical Dentistry Department of Orthodontics
KMID : 0361920130430050218
Abstract
Objective: To examine the effect of bite force on the displacement and stress distribution of orthodontic mini-implants (OMIs) in the molar region according to placement site, insertion angle, and loading direction.
Methods: Five finite element models were created using micro-computed tomography (microCT) images of the maxilla and mandible. OMIs were placed at one maxillary and two mandibular positions: between the maxillary second premolar and first molar, between the mandibular second premolar and first molar, and between the mandibular first and second molars. The OMIs were inserted at angles of 45° and 90° to the buccal surface of the cortical bone. A bite force of 25 kg was applied to the 10 occlusal contact points of the second premolar, first molar, and second molar. The loading directions were 0°, 5°, and 10° to the long axis of the tooth.
Results: With regard to placement site, the displacement and stress were greatest for the OMI placed between the mandibular first molar and second molar, and smallest for the OMI placed between the maxillary second premolar and first molar. In the mandibular molar region, the angled OMI showed slightly less displacement than the OMI placed at 90°. The maximum Von Mises stress increased with the inclination of the loading direction.
Conclusions: These results suggest that placement of OMIs between the second premolar and first molar at 45° to the cortical bone reduces the effect of bite force on OMIs.
키워드
Bite force; Orthodontic mini-implant; Finite element analysis; Stability
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