구강회복응용과학지 (Journal of Dental Rehabilitation and Applied Science)

  • 제27권3호
  • /
  • Pages.293-304
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  • 2011
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  • 2384-4353(pISSN)
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  • 2384-4272(eISSN)
대한턱관절교합학회 (Korean Academy of Stomatognathic Function and Occlusion)
권호 표지

교정용 미니임플란트의 식립각도에 따른 간접골성 고정원의 효과에 대한 유한요소 해석

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

  • 김민지 (이화여자대학교 의학전문대학원 치과학교실 교정과) ;
  • 박영진 (이화여자대학교 임상치의학대학원 임상교정치의학 전공) ;
  • 박선형 ;
  • 전윤식 (이화여자대학교 의학전문대학원 치과학교실 교정과)
  • 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)
  • 투고 : 2011.05.20
  • 심사 : 2011.09.25
  • 발행 : 2011.09.30
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초록

구치부 가위교합을 개선하기 위한 여러 방법 중, 교정용 미니임플란트(OMI)와 조합된 Dragon helix를 이용한 방법이 이전에 소개된 바 있으며 이는 간접 골성고정원의 역할이 중요하다. 이에 본 연구에서는 간접골성고정원으로 사용된 OMI의 식립각도에 따라 나타나는 구치부의 치근에 나타나는 응력분포와 OMI의 표면에서의 응력 분포 및 변위를 유한요소 해석으로 비교하고자 하였다. 상악 제1대구치와 상악 제2소구치의 치근 사이에 OMI의 식립 각도를 골 표면에 대하여, $45^{\circ}$, $60^{\circ}$, $90^{\circ}$으로 변화시키면서 최대응력분포와 변위를 관찰하였다. OMI의 식립 각도가 $90^{\circ}$일 때 상악 제1대구치와 상악 제2대구치의 구개 치근첨에 최대응력분포가 나타났고, 상악 제1대구치에서는 협측으로 변위의 양이 가장 적게 나타났으며, 상악 제2대구치에서는 함입 및 구개측으로의 변위량이 가장 크게 나타났다. OMI에서는 식립각도가 감소됨에 따라 최대 응력분포가 나사첨 부분으로 이동되었으며, 그에 따라 OMI의 변위량은 증가하였다. 이상의 결과로 OMI의 식립각도가 $90^{\circ}$일 때 고정원의 역할이 최대가 되었으며, 구치부 가위교합의 개선 효과가 가장 크게 나타남을 알 수 있었다.

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.

키워드

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