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Effects of the Angulation of Orthodontic Mini-Implant as an Indirect Anchorage : A Three-Dimensional Finite Element Analysis  

Kim, Min-Ji (Division of Orthodontics, Department of Dentistry, School of Medicine, Ewha Womans University)
Park, Yong-Jin (Department of Orthodontics, Graduate School of Clinical Dentistry, Ewha Womans University)
Park, Sun-Hyung (Division of Orthodontics, Department of Dentistry, University of Nebraska medical center)
Chun, Youn-Sic (Division of Orthodontics, Department of Dentistry, School of Medicine, Ewha Womans University)
Publication Information
Journal of Dental Rehabilitation and Applied Science / v.27, no.3, 2011 , pp. 293-304 More about this Journal
Abstract
The purpose of this study was to investigate the displacement and pattern of stress distribution on periodontal ligaments of maxillary first and second molar, and on orthodontic mini-implant (OMI) surface, according to three different insertion angles to the bone surface of OMI using Dragon helix appliance, which is a newly introduced scissors-bite correcting appliance. OMI were placed between second premolar and first molar with three different insertion angles (45, 60, 90 degrees). Displacement and maximum stress distribution area (MSDA) were analyzed by finite element analysis. When the insertion angle to the alveolar bone surface was 90 degrees, maxillary first and second molar both exhibited MSDA at the palatal root apex. Maxillary first molar did not show any significant displacement, while the second molar exhibited intrusive and palatal displacement. On the OMI, as the insertion angle decreased, the MSDA shifted towards the tip, and the amount of displacement had increased. When the OMI was inserted at a 90 degree angle, anchor loss was minimized and scissors-bite correcting effect was maximized.
Keywords
orthodontic mini-implant (OMI); finite element analysis; insertion angulation;
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Times Cited By KSCI : 4  (Citation Analysis)
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