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.
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。