The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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Spatial changes of the maxillofacial complex following maxillary protraction of human dry skull

건조 두개골에서 상악의 전방 견인후 상악 안면 복합체의 공간 변화에 관한 연구

  • Chun, Youn Sic (Department of Orthodontics, Medical College, Ewha Womans University Mokdong Hospital) ;
  • Choi, Jang Woo (Department of Oral and Maxillofacial Surgery, Medicial College, Ewha Womans University) ;
  • Choi, Seung Eun (Department of Orthodontics, Medical College, Ewha Womans University) ;
  • Lee, Seong Geun (Department of Oral and Maxillofacial Surgery, Medicial College, Ewha Womans University)
  • 전윤식 (이화여자대학교 의과대학 교정학교실) ;
  • 최장우 (이화여자대학교 의과대학 교정학교실) ;
  • 최승은 (이화여자대학교 의과대학 교정학교실) ;
  • 이성근 (이화여자대학교 의과대학 교정학교실)
  • Published : 2002.12.01
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Abstract

The purpose of this investigation was to study the spatial changes of the maxillofacial complex following maxillary protraction transmitted to the center of resistance of a dry juvenile human skull by a modified maxillary protraction appliance. Four dry juvenile human skulls (without mandible) with well aligned upper deciduous dentition and early mixed dentition were used as experimental samples. A modified protraction headgear was fabricated from a Delare's facemask, and following an alginate impression, an orthodontic resin maxillary splint was made for each dry skull. Protraction force level was maintained at approximately 1000gm per side for 6 hours. Cephalometric radiographs were taken pre- and post- protraction, and nine reference markers with 1.5 mm length of $.017\times.025$ TMA wire were placed on the right side of the skull for an accurate superimposition of serial cephalometric radiographs. The present investigation demonstrated that vertical changes associated with an anterior displacement of the maxillary complex was observed, and the most prominent effect of protraction headgear was a counterclockwise rotation of the maxilla, that is, a forward and downward tipping around the palatomaxillary region.

이 연구의 목적은 유년기 건조 두개골에서 상악골 전방 견인 장치로 상악골의 저항중심을 지나는 힘을 가했을 때, 상악 골 복합체의 공간 변화를 평가하기 위함이다. 유치열기 혹은 초기 혼합 치열기로 추정되는 건조 두개골 4구를 사용하여 Delare의 facemask로 modified protraction headgear를 제작하였으며, 각각의 두개골에서 알지네이트 인상을 채득한 후 상악 스플린트를 제작하였다. 전방 견인력을 편측 당 1000gm씩 6시간 가하였다. 전방견인 전과 후 측모 두부방사선사진을 촬영하였으며 정확한 중첩이 가능하도록 1.5mm 길이의 $.017\times.025$TMA wire를 사용하여 9개의 reference marker를 두개골 우측에 위치 시켰다. 본 연구를 통해 상악골 전방 견인시 상악골 복합체의 전방 이동과 더불어 수직적 변화를 관찰할 수 있었으며, protraction headgear의 주된 효과는 상악골의 반시계 방향의 회전, 즉 구개상악부(palatomaxillary region)의 전하방 경사 이동에 의한 것임을 알 수 있었다.

Keywords

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