대한치과교정학회지 (The korean journal of orthodontics)

  • 제37권2호
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  • Pages.98-113
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  • 2007
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  • 2234-7518(pISSN)
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  • 2005-372X(eISSN)
대한치과교정학회 (The Korean Association Of Orthodontists)
권호 표지

상악 전치부 후방 견인 시 이동 양상과 응력 분포에 관한 삼차원 유한요소법적 연구

The pattern of movement and stress distribution during retraction of maxillary incisors using a 3-D finite element method

  • 정애진 (원광대학교 치과대학 치과교정학교실) ;
  • 김운수 (원광대학교 치과대학 치과교정학교실) ;
  • 이수행 (원광대학교 치과대학 치과교정학교실) ;
  • 강성수 (원광대학교 치과대학 치과교정학교실) ;
  • 최희인 (원광대학교 치과대학 치과교정학교실) ;
  • 조진형 (원광대학교 치과대학 치과교정학교실) ;
  • 김상철 (원광대학교 치과대학 치과교정학교실)
  • Chung, Ae-Jin (Department of Orthodontics, School of Dentistry, Wonkwang University) ;
  • Kim, Un-Su (Department of Orthodontics, School of Dentistry, Wonkwang University) ;
  • Lee, Soo-Haeng (Department of Orthodontics, School of Dentistry, Wonkwang University) ;
  • Kang, Seong-Soo (Department of Orthodontics, School of Dentistry, Wonkwang University) ;
  • Choi, Hee-In (Department of Orthodontics, School of Dentistry, Wonkwang University) ;
  • Jo, Jin-Hyung (Department of Orthodontics, School of Dentistry, Wonkwang University) ;
  • Kim, Sang-Cheol (Department of Orthodontics, School of Dentistry, Wonkwang University)
  • 발행 : 2007.04.30
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초록

상악 전치부 후방 견인 시의 이동 양상 및 응력 분포를 건조 두개골을 전산화 단층 촬영에 의해 3차원 영상화한 유한 요소 모델 상에서 알아보고자 하였다. 피질골 절단술의 시행 여부와 고정원, 힘의 작용점을 각기 달리 설정하여 8개의 실험군을 구성하여 비교하였다. 통상적인 T-loop을 이용하여 공간폐쇄를 하는 경우 전치부는 후하방으로 경사이동 하였으며, 구치부에서도 약간 전방 이동하였다. 피질골 절단술을 동반하여 전치부를 견인한 경우, 전치부 골편에서의 응력 분포가 전반적으로 넓게 분포되었으며, 전치부 경사의 정도가 적은 반면에 변위량은 훨씬 더 많았다. 협측에서의 견인 시 상악 협측에 식립된 미니 임플랜트와 견치 Power arm간에 견인력을 가한 경우가 미니 임플랜트로 고정원이 강화된 제2소구치와 견치 브라켓 간에 견인력을 가한 경우보다 전치부의 후하방 경사 정도가 적었다. 구개측에서 Powerarm에 대한 견인 시 정중구개봉합 부위에 식립한 미니 임플랜트로부터 견인력을 가한 경우가 상악 제1, 2대구치 간 구개면에 식립된 미니 임플랜트로부터 견인력을 가한 경우보다 전치부의 후하방 경사 정도가 컸다. 이러한 결과로써 치아이동 시 피질골 절단술의 효과와 저항중심에 대한 교정력 벡터 조정의 의미를 확인할 수 있었다.

Objective: The purpose of this study was to evaluate the displacement pattern and the stress distribution shown on a finite element model 3-D visualization of a dry human skull using CT during the retraction of upper anterior teeth. Methods: Experimental groups were differentiated into 8 groups according to corticotomy, anchorage (buccal: mini implant between the maxillary second premolar and first molar and second premolar reinforced with a mini Implant, palatal: mini implant between the maxillary first molar and second molar and mini implant on the midpalatal suture) and force application point (use of a power arm or not). Results: In cases where anterior teeth were retracted by a conventional T-loop arch wire, the anterior teeth tipped more postero-inferiorly and the posterior teeth moved slightly in a mesial direction. In cases where anterior teeth were retracted with corticotomy, the stress at the anterior bone segment was distributed widely and showed a smaller degree of tipping movement of the anterior teeth, but with a greater amount of displacement. In cases where anterior teeth were retracted from the buccal side with force applied to the mini implant placed between the maxillary second premolar and the first molar to the canine power arm, it showed that a smaller degree of tipping movement was generated than when force was applied to the second premolar reinforced with a mini implant from the canine bracket. In cases where anterior teeth were retracted from the palatal side with force applied to the mini implant on the midpalatal suture, it resulted in a greater degree of tipping movement than when force was applied to the mini implant between the maxillary first and second molars. Conclusion: The results of this study verifies the effects of corticotomies and the effects of controlling orthodontic force vectors during tooth movement.

키워드

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