三次元的な下顎枝外側骨片復位・固定システムによる下顎後退術後の後戻りに関する研究

Abstract

We have previously reported an exact three-dimensional repositioning technique for external ramus fragments in sagittal split ramus osteotomy using screw fixation. Eighteen patients with mandibular prognathism who underwent sagittal split ramus osteotomy were studied. In one-half of these cases, a circumferential wire fixation (circum group) was performed, and in the other half a screw fixation with this repositioning technique (screw group) was used. These cases were studied with regard to preoperative, postoperative and one-year postoperative changes in lateral roentogenographic cephalometry. The following results were obtained: 1. There was no clockwise rotation of external fragments in the screw group. 2. Internal fragments relapsed anteriorly in the circum, group. 3. At one-year postoperative follow-up, the mandibular length relapsed 15% in the circum group and 4 % in the screw group.It was suggested that this repositioning technique is effective for preventing postoperative relapse.