The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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Effects of orthodontic mini-implant position in the dragon helix appliance on tooth displacement and stress distribution: a three-dimensional finite element analysis

교정용 미니임플랜트 식립 위치에 따른 dragon helix의 효과에 대한 유한요소해석

  • Kim, Min-Ji (Division of Orthodontics, Department of Dentistry, School of Medicine, Ewha Womans University) ;
  • Park, Sun-Hyung (Division of Orthodontics, Department of Dentistry, University of Nebraska Medical Center) ;
  • Kim, Hyeon-Seong (Department of Orthodontics, Graduate School of Clinical Dentistry, Ewha Womans University) ;
  • Mo, Sung-Seo (Division of Orthodontics, Department of Dentistry, College of Medicine, The Catholic University of Korea, St. Mary's Hospital) ;
  • Sung, Sang-Jin (Department of Orthodontics, University of Ulsan College of Medicine, Asan Medical Center) ;
  • Jang, Gang-Won (School of Mechanical and Automobile Engineering, Kunsan National University) ;
  • Chun, Youn-Sic (Division of Orthodontics, Department of Dentistry, School of Medicine, Ewha Womans University)
  • Received : 2010.08.27
  • Accepted : 2010.10.25
  • Published : 2011.06.30
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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.

Keywords

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