• 제목/요약/키워드: Modified protraction headgear

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건조 두개골에서 상악의 전방 견인후 상악 안면 복합체의 공간 변화에 관한 연구 (Spatial changes of the maxillofacial complex following maxillary protraction of human dry skull)

  • 전윤식;최장우;최승은;이성근
    • 대한치과교정학회지
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    • 제32권6호
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    • pp.425-434
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    • 2002

  • 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.

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Modified Protraction Headgear를 이용한 상악골 전방 견인시 악안면골의 초기반응에 관한 Holographic Interferometry 연구 (A STUDY OF HOLOGRAPHIC INTERFEROMETRY ON THE INITIAL REACTION OF MAXILLOFACIAL COMPLEX TO THE MAXILLARY PROTRACTION USING THE ANTENNA TYPE MODIFIED PROTRACTION HEAD GEAR)

  • 이공근;유영규
    • 대한치과교정학회지
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    • 제22권3호
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    • pp.531-556
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    • 1992

  • The majority of the commonly used protraction headgears for the protraction of small and/or retropositioned maxilla not allow a change in the point of force application or direction of the force delivery to attain predictable results because of the position of the upper and lower lips to avoid discomfort to the patient. The purpose of this study was to investigate the initial reaction of maxillofacial complex according to the change of force variables such as direction and point of force application with designing an antenna type-modified protraction head gear. A macerated human skull with well aligned upper teeth was used to experimental model and the investigation was done by double exposure holographic interferometry. Fringe patterns of each protraction conditions were compared and analized. The results were as follows. (Frontal view) 1. The Counterclockwise rotation of the maxilla was showed by parallel protraction to occlusal plane and the fringe was decreased in number as higher point of force application. 2. Generally, the number of fringe was increased in 500gm of protraction force than in 300gm. 3. When apply the protraction force to the maxilla with rapid palatal expansion, the direction of fringe patterns was differed from the protraction without expansion. 4. In most of cases, the counterclockwise rotation was decreased in case of the direction of the force is $20^{\circ}$ downward to occlusal plane compared to the parallel direction. 5. At the point of force application is 15mm above and the direction of force is 20 downward to occlusal plane , the translation of the maxillary complex was showed. (Lateral view) 6. The direction of fringe patterns of the facial bones were differed each other by the sutures, and showed almost parallel when apply the 300gm and 500gm of protraction force. 7. In case of rapid palatal expansion with protraction of the maxilla, the fringe patterns between the maxillary area and the area from the posterior of the maxillary first molar to the pterygomaxillary fissure were differed. In case without rapid palatal expansion, the changes of direction and point of the force application did not affect to the direction and the number of the fringe patterns.

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