Effects of orthodontic mini-implant position in the dragon helix appliance on tooth displacement and stress distribution: a three-dimensional finite element analysis
김민지, 박선형, 김현성, 모성서, 성상진, 장강원, 전윤식,
소속 상세정보
김민지 ( Kim Min-Ji ) - 이화여자대학교 치과대학
박선형 ( Park Sun-Hyung ) - University of Nebraska Medical Center Department of Dentistry
김현성 ( Kim Hyeon-Seong ) - 이화여자대학교 치과대학
모성서 ( Mo Sung-Seo ) - 가톨릭대학교 성모병원 치과교정과
성상진 ( Sung Sang-Jin ) - 울산대학교 의과대학 서울아산병원 치과교정과
장강원 ( Jang Gang-Won ) - 군산대학교 기계공학과
전윤식 ( Chun Youn-Sic ) - 이화여자대학교 의과대학 치과학교실
KMID : 0361920110410030191
Abstract
Objective: The purpose of this study was to investigate the stress distribution on the orthodontic mini-implant (OMI) surface and periodontal ligament of the maxillary first and second molars as well as the tooth displacement according to the OMI position in the dragon helix appliance during scissors-bite correction.
Methods:OMIs were placed at two maxillary positions, between the first and the second premolars (group 1) and between the second premolar and the first molar (group 2). The stress distribution area (SDA) was analyzed by three-dimensional finite element analysis.
Results: The maximal SDA of the OMI did not differ between the groups. It was located at the cervical area and palatal root apex of the maxillary first molar in groups 1 and 2, respectively, indicating less tipping in group 2. The minimal SDA was located at the root and furcation area of the maxillary second molar in groups 1 and 2, respectively, indicating greater palatal crown displacement in group 2.
Conclusions: Placement of the OMI between the maxillary second premolar and the maxillary first molar to serve as an indirect anchor in the dragon helix appliance minimizes anchorage loss while maximizing the effect on scissors-bite correction.
키워드
Orthodontic mini-implant; FEM
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