Yin Q, Bi R, Abotaleb B, Jiang N, Li Y, Zhu S
State Key Laboratory of Oral Diseases &National Clinical Research Center for Oral Diseases & Other Research Platform & Dept. of Oral and Maxillofacial Surgery, West China Hospital of Stomatology, Sichuan University.
State Key Laboratory of Oral Diseases &National Clinical Research Center for Oral Diseases & Other Research Platform & Dept. of Oral and Maxillofacial Surgery, West China Hospital of Stomatology, Sichuan University; Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Ibb University, Ibb, Yemen.
Br J Oral Maxillofac Surg. 2019 Dec;57(10):1086-1091. doi: 10.1016/j.bjoms.2019.09.022. Epub 2019 Oct 14.
The purpose of this study was to compare the condylar positional changes after bilateral sagittal split ramus osteotomy (BSSRO) in patients with mandibular retrusion and those with mandibular prognathism. We also studied the correlation between the degree of matching of the condyle and fossa, and condylar displacement. Thirty patients with mandibular retrusion (n=11) or mandibular prognathism (n=19) who underwent BSSRO were included. The condylar position was assessed from spiral computed tomographic (CT) scans taken preoperatively, during the first postoperative week, and at least 6 months postoperatively. All data were measured by MIMICS 17.0 and analyzed by Student's t test and Pearson's correlation analysis. The size of the condyles of patients with mandibular retrusion was significantly less than those of patients with mandibular prognathism (491.5 (172.8) compared with 823.2 (212.0) mm). The size of the glenoid fossa in those with mandibular retrusion (599.6 (110.4) mm) and those with prognathism (597.6 (151.6) mm) did not seem to differ. Postoperatively the condyles moved outwards, backwards, and downwards in both groups of patients. Correlation analysis between the condyle:fossa volume ratio and the condylar positional changes showed that a large condyle:fossa volume ratio correlated with the smaller positional changes in the condyle. The condylar position changed immediately after mandibular advancement and setback, and persisted in the long term. Larger condyles tended to have fewer positional changes.
本研究的目的是比较下颌后缩患者和下颌前突患者双侧矢状劈开下颌支截骨术（BSSRO）后的髁突位置变化。我们还研究了髁突与关节窝匹配程度和髁突移位之间的相关性。纳入了30例行BSSRO的下颌后缩患者（n = 11）或下颌前突患者（n = 19）。通过术前、术后第一周以及术后至少6个月的螺旋计算机断层扫描（CT）评估髁突位置。所有数据均由MIMICS 17.0测量，并通过学生t检验和Pearson相关分析进行分析。下颌后缩患者的髁突大小明显小于下颌前突患者（491.5（172.8）与823.2（212.0）mm）。下颌后缩患者（599.6（110.4）mm）和下颌前突患者（597.6（151.6）mm）的关节窝大小似乎没有差异。术后两组患者的髁突均向外、向后和向下移动。髁突与关节窝体积比和髁突位置变化之间的相关分析表明，较大的髁突与关节窝体积比与髁突较小的位置变化相关。下颌前伸和后退后髁突位置立即改变，并长期持续。较大的髁突往往位置变化较少。
