상악골 급속확장에 의한 Angle씨 제Ⅲ급 부정교합 환자의 안모형태 변화에 관한 두부방사선 계측학적 연구

A Cephalometric Study on the hard and Soft Tissue Changes by the Papid Palatal Expansion in Angle ;s ClassⅢMalocclusion

This stydy was undertaken to evaluate the cephalometric changes of the soft tissue and skeletal profile subsequent to the palatal expansion in 25 Angle´s Class III cases, ranging in age from six to fifteen years, with cross-bite of the anterior teeth, underdevelopment of maxilla and facial disharmony. Following results were obtained: 1. ANS moved downward, Point A presented forward & downward movement increasing SNA and point B presented backward & downward movement decreasing SNB. 2. Mandible was rotated to backward & forward and maxilla moved forward & downward with the bite opening and improvement of anterior teeth cross-bite. 3. Soft tissue on inadible was rotated to backward & downward rotation of Point B´, Pog´. 4. Respones of the upper lip was more significant in downward than forward direction, and correlated with the upper central incisor and mandible rotation. 5. Reaponse of the lower lip was mord significant in downward than backward direction, and correlated with the mandible rotation. 6. There was a rather high degree of correlation between skeletal porfile and soft-tissue profile, ㅗ:LS, 1:Pog´, Pog:LS, Pog:LI:Pog´ in horizontal measurements and 1:Pog´, Pog:LI, Pog:Pog´ in vertical measurements.