골격성 제 3급 부정교합환자의 하악지 시상분할 골절단술후 하안면 폭경 및 고경의 변화에 대한 두부계측 방사선학적 연구

초록

Purpose: The purpose of this study was to analyze the lower third facial changes in frontal view after mandibular setback surgery. Materials and Methods: In this study, fifteen subjects (6 males and 9 females) with class Ⅲ dental and skeletal malocclusions who were treated with BSSRO (Bilateral Sagittal Split Ramus Ostetomy) were used. Frontal cephalometric radiographs were taken preoperatively and more than 6 months postoperatively, and hard tissue (H2-H1) and soft tissue changes (S2-S1) were measured on vertical and horizontal reference lines. In 15 cases, changes which developed more than 6 months after surgery were studied. Results: The results were as follows. 1. In the facial height, hard tissue decreased (2.46±2.76mm) with statistical significance (P<0.01), and soft tissue also decreased (1.64±3.66mm). As a result, the facial height generally becomes shorter after sagittal split ramus osteotomy. 2. In the mandibular width, hard tissue decreased (2.08±3.59mm) with statistical significance (P<0.05), but soft tissue increased (2.14±5.73mm) without statistically significant difference (P>0.05) postoperatively. 3. In the facial index, hard tissue decreased (0.23±2.21%), but soft tissue increased (2.41±3.46%) with statistical significance. Conclusion :One of the main purpose of orthognathic surgery is to achieve facial esthetics and harmony. In order to fullfill this purpose, it is important to carry out a precise presurgical treatment planning by estimating the changes of frontal profile after surgery.

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