The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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Spatial changes of the upper dentition following en-masse space closure: A comparison between first and second premolar extraction

En-masse 견인에 의한 발치공간 폐쇄 후 상악치열의 이동양상 -제1소구치 및 제2소구치 발치 비교

  • Kim, Hui-Jung (Department of Dentistry, Graduate School of Medicine, Ewha Womans University) ;
  • Chun, Youn-Sic (Department of Dentistry, Graduate School of Medicine, Ewha Womans University) ;
  • Jung, Sang-Hyuk (Department of Preventive Medicine, College of Medicine, Ewha Womans University)
  • 김희정 (이화여자대학교 의과대학 치과학교실 교정과) ;
  • 전윤식 (이화여자대학교 의과대학 치과학교실 교정과) ;
  • 정상혁 (이화여자대학교 의과대학 예방의학교실)
  • Published : 2005.10.01
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Abstract

The purpose of this experimental study was to evaluate aㅜd compare maxillary arch dimensional and positional changes between first and second premolar extraction groups. The Calorific Machine was used to illustrate tooth movement in three dimensions. The experimental teeth except the first or second premolars were embedded in artifical alveolar bone. The extraction space was closed using arch wires with bull loops into which 15 degree gable bends were placed. Before and after space closure, radiographs were taken in the sagittal and occlusal directions using occlusal films. The results showed greater mean maxillary incisor retraction and less anchorage loss in the maxillary first premolar extraction group than in the maxillary second premolar extraction group. Mesiopalatal rotation of anchor teeth was greater after extraction of a maxillary second premolar than a maxillary first premolar (P<.001).

제1소구치 또는 제2소구치 발치 후 발치공간 폐쇄 시 치아이동의 양상 즉, 치아이동방향과 이동량을 구명하는 것이 본 연구의 목적이었다. 상악 우측 인공 치조골부에 제1소구치 또는 제2소구치를 제외한 중절치부터 제2대구치 까지 실험용 치아들을 식립하고 bull loop이 형성된 반쪽 호선에 15도의 gable bend를 부여한 후 전치부를 후방견인하여 발츠공간을 폐쇄시켰다. 실험 전후에 교합면 방사선사진과 시상면 방사선사진을 촬영하고 인공치조골부 하단에 식립된 기준표지점에 중첩하여 이동방향 및 이동량을 계측하였다. 그 결과 제2소구치 발치군의 전치부후방이동량이 제1소구치 발치군에 비해 더 적었으며 구치부의 고정원 소실 및 고정원의 근심설측회전량은 제2소구치 발치군에서 더 크게 나타났다.

Keywords

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