하악전돌환자의 하악지시상분할골절단술 후의 원심골편의 후방경계의 골흡수에 대한 연구

A STUDY OF BONE RESORPTION AT THE POSTERIOR BORDER OF DISTAL SEGMENT AFTER BILATERAL SAGITTAL SPLIT RAMUS OSTEOTOMY OF MANIBULAR PROGNATHIC PATIENTS

Purpose This study is to predict the changes of the distal segment by investing the resorption of the excessive distal segment regarding the amount of setback after BSSRO. Material and Methods 20 patients with Mandible prognathism treated by Obwegeser-Dal Pont method during the years 2000 to 2002 were selected for this study. Group A consisted of 5 males & 5 females with a setback amount of 10mm and above(Mean 10.80mm±1.03, n=20) and Group B consisted of 2 males & 8 females with a setback amount of below 10mm.(Mean 6.10mm±1.10, n=20) Panorama X-ray was taken at day 1, 1month, 3months, 6months, and 12months after the surgery. Resorption areas of excessive distal segment were measured on these panorama X-rays and compared. Results There was bone resorption in both groups. Group A showed more bone resorption than Group B. Group B showed slightly higher resorption rate than Group A. However, there was no statistically significant difference between the resorption rates of Group A and Group B. (P>0.05) Conclusion More bone resorption occurred with a larger amount of setback and about one third of the excessive distal segment underwent resorption, irrespective of the amount of setback.