Abstract：
OBJECTIVE: This retrospective study aimed to evaluate sequential changes in soft tissue thickness after bilateral sagittal split ramus osteotomy (BSSRO) in skeletal class III patients with facial asymmetry and to explore their correlation with surgical movements for optimal postoperative facial symmetry and esthetic outcomes.
METHODS: This study included 37 patients with class III malocclusion and > 4 mm Menton (Me) deviation who underwent BSSRO. Posteroanterior cephalograms were captured at preoperative (T0), 6 weeks (T1), 6 months (T2), and 1 year (T3) postoperative intervals to analyze changes in Me deviation, fronto-ramal inclination (FRI), and soft tissue thickness. Statistical analysis was conducted to assess the changes in soft tissue thickness over time and the effects of surgical correction.
RESULTS: Significant improvements in facial asymmetry were noted after surgery, with reductions in Me deviation and FRI on both the deviated side (DS) and non-deviated side (NDS). An increase in soft tissue thickness was observed on both the DS and NDS after surgery, with the NDS showing a continued increase between 6 months and 1 year, indicating an ongoing compensation for symmetry restoration. The study also identified a positive correlation between the surgical movement of the FRI and the increase in soft tissue width on the NDS after 6 months.
CONCLUSIONS: This study established that soft tissue thickness continues to adapt and change up to 1 year after BSSRO, underscoring the need for a long-term evaluative approach in orthognathic surgery for patients with facial asymmetry.
METHODS: This study included 37 patients with class III malocclusion and > 4 mm Menton (Me) deviation who underwent BSSRO. Posteroanterior cephalograms were captured at preoperative (T0), 6 weeks (T1), 6 months (T2), and 1 year (T3) postoperative intervals to analyze changes in Me deviation, fronto-ramal inclination (FRI), and soft tissue thickness. Statistical analysis was conducted to assess the changes in soft tissue thickness over time and the effects of surgical correction.
RESULTS: Significant improvements in facial asymmetry were noted after surgery, with reductions in Me deviation and FRI on both the deviated side (DS) and non-deviated side (NDS). An increase in soft tissue thickness was observed on both the DS and NDS after surgery, with the NDS showing a continued increase between 6 months and 1 year, indicating an ongoing compensation for symmetry restoration. The study also identified a positive correlation between the surgical movement of the FRI and the increase in soft tissue width on the NDS after 6 months.
CONCLUSIONS: This study established that soft tissue thickness continues to adapt and change up to 1 year after BSSRO, underscoring the need for a long-term evaluative approach in orthognathic surgery for patients with facial asymmetry.
摘要：
目的：这项回顾性研究旨在评估骨性III类面部不对称患者双侧矢状位劈开大支截骨术（BSSRO）后软组织厚度的顺序变化，并探讨其与手术动作的相关性，以获得最佳的术后面部对称性和美学效果。
方法：本研究包括37例III类错牙合畸形和>4mmMenton（Me）偏差患者，他们接受了BSSRO。术前（T0）采集后眼前头颅图，6周（T1），6个月（T2），和术后1年（T3）间隔，以分析Me偏差的变化，前臂倾斜（FRI），和软组织厚度。进行统计分析以评估软组织厚度随时间的变化以及手术矫正的效果。
结果：术后面部不对称显著改善，偏离侧(DS)和非偏离侧(NDS)的Me偏差和FRI均减少。手术后DS和NDS均观察到软组织厚度增加，随着NDS在6个月到1年之间持续增加，表明对对称性恢复的持续补偿。该研究还确定了FRI的手术运动与6个月后NDS上软组织宽度的增加之间的正相关。
结论：这项研究表明，软组织厚度在BSSRO后1年内持续适应和变化，强调在面部不对称患者的正颌手术中需要长期评估方法。
方法：本研究包括37例III类错牙合畸形和>4mmMenton（Me）偏差患者，他们接受了BSSRO。术前（T0）采集后眼前头颅图，6周（T1），6个月（T2），和术后1年（T3）间隔，以分析Me偏差的变化，前臂倾斜（FRI），和软组织厚度。进行统计分析以评估软组织厚度随时间的变化以及手术矫正的效果。
结果：术后面部不对称显著改善，偏离侧(DS)和非偏离侧(NDS)的Me偏差和FRI均减少。手术后DS和NDS均观察到软组织厚度增加，随着NDS在6个月到1年之间持续增加，表明对对称性恢复的持续补偿。该研究还确定了FRI的手术运动与6个月后NDS上软组织宽度的增加之间的正相关。
结论：这项研究表明，软组织厚度在BSSRO后1年内持续适应和变化，强调在面部不对称患者的正颌手术中需要长期评估方法。
