하악골 전돌증의 악교정수술후 회귀도에 관한 연구

Relapse predictability in surgical correction of mandibular prognathism

The purpose of this study is to investigate the etiologic factors on the relapse after orthognathic surgery. This study was based on the 13 patients with mandibular prognathism who had a surgical retrusive movement of the mandible at the Dept. of Oral Surgery, College of Dentistry, Yonsei University. We have taken serial cephalogram; before surgery (Ⅰ), immediately after surgery (Ⅱ), and from six months to one year after surgery (Ⅲ). A multiple regression analysis was used to determine relationships between the changes during sugery (Ⅱ-Ⅰ) and relapse after surgery (Ⅲ-Ⅱ). The results were obtained as follows, 1. There were positive correlation between horizontal movements of Pogonion and horizontal relapse of that. (ϓ=0.62648, p ＜ 0.05) 2. There were positive correlation between horizontal movements and horizontal relapse of pogonion except horizontal relapse by rotation of mandibular plane. (ϓ=0.67221, p＜0.05) 3. Horizontal relapse was beginning to see when the amounts of retrusive movement were about 7 ㎜. 4. There were reverse correlation between changes of mandibular plane angle and relapse of that. (ϓ=-0.79938, p＜0.05)