하악골전돌증의 치료를 위해 하악지 시상분할골절단술시 의도적인 원심골편 후방골절제술후 하악골의 위치적 안정성에 관한 연구

Positional stability following intentional posterior ostectomy of distal segment in the bilateral sagittal split rami osteotomy for correction of mandibular prognathism

For the purpose of maximal reduction of postoperative positional change, we have recently tried a technique, intentional ostectomy of posterior part of distal segment, in the bilateral sagittal split rami osteotomy(BSSRO). This study done based on 42 cases of technique of BSSRO with rigid fixation was performed in 23. cases as a control group and our technique of additional distal cutting in the other 19 cases as a test group. Horizontal and vertical change were measured to determine the amount of long-term postoperative relapse indices. The results were as follows ; 1. Relapse index of test group were lower than control group significantly in 2, 6, 12 months postopratively(p<0.05). 2. Average value of horizontal relapse index of test group was lower than control group in all periods postoperatively, but insignificant statistically. 3. Vertical relapse index of test group were lower than control group significantly in 6 and 12 months postoperatively(p<0.05). 4. Facial length relapse index of test group were significantly lower than control group in 12 months postoperatively. In conclusion, this method can be considered useful method to gain the maximum post-operative positional stability. In addition, it could be especially well adapted for the correction of mandibular prognathism accompaning open bite.