Kim Dae-Seung, Choi Soon-Chul, Lee Sam-Sun, Heo Min-Suk, Huh Kyung-Hoe, Hwang Soon-Jung, Yi Won-Jin
Interdisciplinary Program in Radiation Applied Life Science Major, College of Medicine, BK21, and Dental Research Institute, Seoul National University, Seoul, Korea.
Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2010 Nov;110(5):648-56. doi: 10.1016/j.tripleo.2010.06.007.
The purpose of this study was to analyze the relationship between mandibular movement and facial morphology parameters measured using 3-dimensional CT data.
We have developed a mandibular movement tracking and simulation system. The mandibular movement data were acquired from 22 subjects (6 males and 16 females), 3 who had no clinical facial deformities and 19 who had orthofacial deformities. The subjects voluntarily performed maximum mouth opening and closing movements. Three-dimensional maximum linear movements of selected points (bilateral condylions, infradentale, and pogonion) were calculated to represent mandibular movement. Facial morphology values were measured 3-dimensionally from CT data and bilateral morphological values were divided into 2 groups according to the mandibular deviation, the deviated side, and counter-deviated side groups. Correlation coefficients were calculated to evaluate the relationship between mandibular movements and facial morphology.
Maximum linear movements of all selected points on the mandible were positively correlated with sella-nasion-point A (SNA) and sella-nasion-point B (SNB). Movements of the infradentale and pogonion were significantly correlated with ramus inclination, lateral mandibular body angle, ramus length, and mandibular body length. Condylar movement was positively correlated with lateral mandibular body angle and mandibular body length. Multiple stepwise linear regression analysis was performed to evaluate the model predicting the effect of morphological values on mandibular movement. Condylar movement was associated with the SNA (R(2) value = 0.32 for the deviated side, R(2) value = 0.26 for the counter-deviated side), and movement of the infradentale was associated with both SNA and ramus length (R(2) value = 0.57). Movement of the pogonion could be predicted by SNA, mandibular length, and condylar head length (R(2) value = 0.65).
The 3D facial morphology values were associated with variations in mandibular movement, and morphological parameters contributed to predicting the movement of the mandible with different degrees.
本研究旨在分析下颌运动与使用三维CT数据测量的面部形态参数之间的关系。
我们开发了一种下颌运动跟踪与模拟系统。从22名受试者（6名男性和16名女性）获取下颌运动数据，其中3名无临床面部畸形，19名有正颌面部畸形。受试者自愿进行最大程度的张口和闭口运动。计算选定标点（双侧髁突、下齿槽点和颏前点）的三维最大线性运动以代表下颌运动。从CT数据中三维测量面部形态值，并根据下颌偏斜、偏斜侧和反偏斜侧组将双侧形态值分为2组。计算相关系数以评估下颌运动与面部形态之间的关系。
下颌骨上所有选定标点的最大线性运动与蝶鞍-鼻根-点A（SNA）和蝶鞍-鼻根-点B（SNB）呈正相关。下齿槽点和颏前点的运动与下颌升支倾斜度、下颌体外侧角、下颌升支长度和下颌体长度显著相关。髁突运动与下颌体外侧角和下颌体长度呈正相关。进行多元逐步线性回归分析以评估预测形态值对下颌运动影响的模型。髁突运动与SNA相关（偏斜侧R²值 = 0.32，反偏斜侧R²值 = 0.26），下齿槽点的运动与SNA和下颌升支长度均相关（R²值 = 0.57）。颏前点的运动可由SNA、下颌长度和髁突头长度预测（R²值 = 0.65）。
三维面部形态值与下颌运动变化相关，形态参数在不同程度上有助于预测下颌运动。
