Journal of Dental Rehabilitation and Applied Science (구강회복응용과학지)

Korean Academy of Stomatognathic Function and Occlusion (대한턱관절교합학회)
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3-dimensional finite element analysis of maxillary molar distalization using R-jig with TADs

TADs와 R-jig를 이용한 상악 구치 원심 이동에 관한 3차원 유한요소 분석

  • Tark, Myung-Hyun (Department of Orthodontics, Sanbon Dental Hospital, Wonkwang University) ;
  • Lee, Keunyoung (Department of Orthodontics, Sanbon Dental Hospital, Wonkwang University) ;
  • Cho, Jin-Woo (Department of General Dentistry, Daejeon Dental Hospital, Wonkwang University) ;
  • Chee, Young-Deok (Department of Oral & Maxillofacial Sugery, Sanbon Dental Hospital, Wonkwang University) ;
  • Cho, Jin-Hyoung (Department of Orthodontics, Sanbon Dental Hospital, Wonkwang University)
  • 탁명현 (원광대학교 치과대학 산본치과병원 치과교정과) ;
  • 이근영 (원광대학교 치과대학 산본치과병원 치과교정과) ;
  • 조진우 (원광대학교 치과대학 대전치과병원 통합진료과) ;
  • 지영덕 (원광대학교 치과대학 산본치과병원 구강악안면외과) ;
  • 조진형 (원광대학교 치과대학 산본치과병원 치과교정과)
  • Received : 2014.09.27
  • Accepted : 2014.11.11
  • Published : 2014.12.31
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Abstract

Purpose: The purpose of this study was to investigate the differences of displacement pattern depending on type of sliding jig and application method during maxillary molar distalization with temporary anchorage devices (TADs). Materials and Methods: Maxilla with normal tooth size and arch shape was selected to create a 3-dimensional finite element model, which included the bracket, orthodontic main archwire, removable sliding jig (R-jig). The orthodontic mini-implant anchorage was set 8 mm superiorly from main archwire, buccally between the second premolar and first molar. The base experimental design was Condition 1, which was composed $0.019{\times}0.025$ inch stainless steel (SS) of wire size of R-jig, 200 gm force, un-tied state. And the other designs varied to wire size of R-jig, magnitude of force. The results are as follows. Results: As the wire size of R-jig was increased, the deformation of R-jig was decreased. However, the displacement of second molar wasn't different each other. As the force to second molar was increased, the more displacement of second molar was observed, and the more distal tipping movement, vetical displacement was observed. Conclusion: R-jig can get distal teeth movement in orthodontic treatment without side effects.

목적: 고정식 교정장치에서 removable sliding jig (R-jig)와 temporary anchorage devices (TADs)를 이용하여 상악 구치의 원심 이동 시 힘의 크기와 와이어의 단면 크기에 따른 치아 이동과 치조골에 미치는 효과의 차이를 유한요소방법을 통하여 분석하고자 한다. 연구 재료 및 방법: 정상적인 치아 크기와 악궁 형태를 가진 상악 치아와 상악 치조골을 3차원 형상 모델링하고, 브라켓, 교정용 호선 및 R-jig를 포함한 유한요소 모델을 제작하였다. 골격성 고정원인 mini-implant를 제2소구치와 제1대구치 사이 협측으로 주호선 기준 8 mm 상방 위치시키고, mini-implant를 직접 고정원으로 사용하여 R-jig에 후방력을 부여하였다. 주호선을 $0.019{\times}0.025$ inch SS로 설정하고, R-jig의 와이어 단면 크기를 $0.019{\times}0.025$ inch SS, 후방력의 크기를 200 gm, 결찰을 하지 않는 조건을 기준 조건으로 설정하였다. 그리고 R-jig의 와이어 단면 크기, 후방력의 크기를 다르게 한 조건들을 설정하여 비교하였다. 결과: R-jig의 와이어 단면 크기가 증가함에 따라 후방력에 의한 R-jig의 변형이 적게 관찰되었지만, 제2대구치의 변위량은 아주 미미한 차이를 보였다. 제2대구치에 가해지는 후방력의 크기가 증가할수록 변위량도 같이 증가하였고, 원심경사 경향과 수직 변위량도 더 커졌다. 결론: R-jig는 임상적으로 큰 부작용 없이 치아의 원심이동을 가능하게 한다.

Keywords

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