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Abstract：
Introduction Lips play a fundamental role in facial attractiveness and in decisions pertaining to orthognathic surgery. Objective To assess the upper lip changes following Le Fort I osteotomy for maxillary advancement and/or impaction. Methods In the present retrospective non-randomized clinical trial, we evaluated 3 groups of patients who underwent Le Fort I osteotomy of the maxilla. Group 1 (n = 35) underwent maxillary advancement, group 2 (n = 14), maxillary impaction, and group 3 (n = 11) was submitted to both maxillary advancement and impaction. The lip thickness of all patients was measured preoperatively, and the participants in each group were categorized into two subgroups: thin (< 12 mm) and thick (> 12 mm) lip. The primary (before orthognathic surgery) and final (after orthodontic bracket removal) lateral cephalograms of the patients were analyzed using the Dolphin software. Comparisons were made using the paired t -test and linear regression in the IBM SPSS Statistics for Windows software. Results The length of the upper lip increased by 1 mm ( p = 0.012) on average following maxillary advancement, and it decreased by 0.43 mm ( p = 0.24) on average following maxillary impaction. In the maxillary advancement group, the change in angulation of the incisors predicted the incisal display ( p = 0.03). In the maxillary impaction group, skeletal changes in the vertical dimension predicted changes in upper lip length ( p = 0.033). Conclusions Le Fort I osteotomy for maxillary advancement significantly increases the length of the upper lip. The assessment of lip thickness prior to surgery can help predict the postoperative results. Changing the angulation of the incisors can predict the incisal display. In maxillary impaction, skeletal changes in the vertical dimension can predict the changes in the length of the upper lip.
摘要：
简介嘴唇在面部吸引力和与正颌手术有关的决定中起着基本作用。目的评估LeFortI截骨术治疗上颌骨前移和/或嵌塞后上唇的变化。方法在本回顾性非随机临床试验中，我们评估了3组接受LeFortI上颌骨截骨术的患者。第1组（n=35）进行上颌前移，第2组(n=14)，上颌嵌塞,第3组（n=11）同时接受上颌前移和嵌塞。术前测量所有患者的嘴唇厚度，每组参与者分为两个亚组:嘴唇薄(<12毫米)和嘴唇厚(>12毫米)。使用Dolphin软件分析患者的主要（正颌手术前）和最终（正畸托槽移除后）侧位脑图。在IBMSPSSStatisticsforWindows软件中使用配对t检验和线性回归进行比较。结果上颌前移后上唇长度平均增加1mm(p=0.012),上颌撞击后平均减少0.43mm（p=0.24）。上颌前移组,切牙角度的变化预测了切牙显示（p=0.03）。在上颌嵌塞组中，垂直尺寸的骨骼变化预测了上唇长度的变化（p=0.033）。结论LeFortI截骨术上颌前移可显着增加上唇的长度。手术前对嘴唇厚度的评估可以帮助预测术后结果。改变切牙的角度可以预测切牙显示。在上颌嵌塞中，骨骼在垂直维度上的变化可以预测上唇长度的变化。
