Interdisciplinary Program in Radiation Applied Life Science Major, College of Medicine, BK21, Seoul National University, Seoul, South Korea; Dental Research Institute, School of Dentistry, Seoul National University, Seoul, South Korea.
J Craniomaxillofac Surg. 2013 Oct;41(7):686-93. doi: 10.1016/j.jcms.2013.01.011. Epub 2013 Mar 5.
The purpose of this study was to investigate the relationship between changes in three-dimensional (3D) facial morphology and mandibular movement after orthognathic surgery. We hypothesized that facial morphology changes after orthognathic surgery exert effects on 3D mandibular movement.
We conducted a prospective follow-up study of patients who had undergone orthognathic surgical procedures. Three-dimensional facial morphological values were measured from facial CT images before and three months after orthognathic surgery. Three-dimensional maximum mandibular opening (MMO) values of four points (bilateral condylions, infradentale, and pogonion) were also measured using a mandibular movement tracking and simulation system. The predictor variables were changes in morphological parameters divided into two groups (deviated side (DS) or contralateral side (CS) groups), and the outcome variables were changes in the MMO at four points.
We evaluated 21 subjects who had undergone orthognathic surgical procedures. Alterations in the TFH (total facial height), LFH (lower facial height), CS MBL (mandibular body length), and DS RL (ramus length) were negatively correlated with changes in bilateral condylar movement. The UFH, DS MBL and CS ML (mandibular length) showed correlations with infradentale movement. The CS ML, DS ML, MBL, UFH, and SNB were correlated with pogonion movement.
The height of the face is most likely to affect post-operative mandibular movement, and is negatively correlated with movement changes in the condyles, infradentale and pogonion. The changes in CS morphological parameters are more correlated with mandibular movement changes than the DS. The changes in CS MBL and bilateral RL were negatively correlated with condylar movement changes, while the bilateral MBL and CS ML were positively correlated with changes in infradentale and pogonion.
本研究旨在探讨正颌手术后三维（3D）面部形态变化与下颌运动的关系。我们假设正颌手术后面部形态的变化会影响下颌的 3D 运动。
我们对接受正颌手术的患者进行了前瞻性随访研究。在正颌手术前和术后三个月，通过面部 CT 图像测量三维面部形态学值。使用下颌运动跟踪和模拟系统测量四个点（双侧髁突、下颌切迹和颏顶点）的最大下颌开口（MMO）值。预测变量为形态参数变化分为两组（偏侧（DS）或对侧（CS）组），结果变量为四个点的 MMO 变化。
我们评估了 21 名接受正颌手术的患者。TFH（总面高）、LFH（下面高）、CS MBL（下颌体长）和 DS RL（下颌升支长）的变化与双侧髁突运动的变化呈负相关。UFH、DS MBL 和 CS ML（下颌长）与下颌切迹运动相关。CS ML、DS ML、MBL、UFH 和 SNB 与颏顶点运动相关。
面部高度最有可能影响术后下颌运动，与髁突、下颌切迹和颏顶点的运动变化呈负相关。CS 形态学参数的变化与下颌运动变化的相关性大于 DS。CS MBL 和双侧 RL 的变化与髁突运动的变化呈负相关，而双侧 MBL 和 CS ML 的变化与下颌切迹和颏顶点的变化呈正相关。
