Lee Joo Young, Han Se Jin
Department of Oral and Maxillofacial Surgery, College of Dentistry, Dankook University, Cheonan, Korea.
J Korean Assoc Oral Maxillofac Surg. 2021 Aug 31;47(4):249-256. doi: 10.5125/jkaoms.2021.47.4.249.
The purpose of this study was to evaluate the postoperative anteroposterior stability and improvements in facial asymmetry after performing LeFort I osteotomy in the maxilla, sagittal split ramus osteotomy (SSRO) and intraoral vertical ramus osteotomy (IVRO) in the mandible, and lateral corticectomy on the IVRO side.
From July 2009 to October 2018, a retrospective analysis was performed on 11 subjects. Lateral cephalometric radiograph was performed preoperatively (T0), postoperatively (T1), and at 12 months of follow-up (T2), and the B point distance was measured. Posteroanterior cephalometric radiograph was performed preoperatively (S0) and at 12 months of follow-up (S1) and was used to measure five indicators (Ag angle, M-Ag, Co-Ag, Co-Me, and Ag-Me) of facial asymmetry.
The B point distances for T0 and T1 were significantly different (=0.007), whereas those for T1 and T2 were not significantly different (=0.1). In addition, there was a significant difference between the B point distances of T2 and T0 (=0.026). Comparison of the facial asymmetry indicators before and after surgery showed a significant difference for all indicators between S0 and S1: the -values of Ag angle, M-Ag, Co-Ag, Co-Me, and Ag-Me were 0.003, 0.003, 0.008, 0.006, and 0.004, respectively. The Z value was based on negative ranks.
There was no significant difference in the B point distances from postoperation to the 12-month follow-up. However, there were significant differences in all five indicators related to facial asymmetry before and after surgery. The values for the five indicators of facial asymmetry all increased postoperatively.
本研究的目的是评估在上颌进行LeFort I截骨术、在下颌进行矢状劈开下颌升支截骨术（SSRO）和口内下颌升支垂直截骨术（IVRO）以及在IVRO侧进行外侧皮质切除术术后的前后稳定性和面部不对称的改善情况。
2009年7月至2018年10月，对11名受试者进行回顾性分析。术前（T0）、术后（T1）及随访12个月（T2）时拍摄头颅侧位片，并测量B点距离。术前（S0）及随访12个月（S1）时拍摄正位头颅片，用于测量面部不对称的五项指标（Ag角、M-Ag、Co-Ag、Co-Me和Ag-Me）。
T0和T1时的B点距离有显著差异（P = 0.007），而T1和T2时的B点距离无显著差异（P = 0.1）。此外，T2和T0的B点距离之间存在显著差异（P = 0.026）。手术前后面部不对称指标的比较显示，S0和S1之间所有指标均有显著差异：Ag角、M-Ag、Co-Ag、Co-Me和Ag-Me的P值分别为0.003、0.003、0.008、0.006和0.004。Z值基于负秩。
术后至12个月随访时B点距离无显著差异。然而，手术前后与面部不对称相关的所有五项指标均有显著差异。面部不对称的五项指标术后值均升高。
