Baek Seung-Hak, Cho Il-Sik, Chang Young-Il, Kim Myung-Jin
Department of Orthodontics, School of Dentistry, Dental Research Institute, Seoul National University, Seoul, South Korea.
Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2007 Nov;104(5):628-39. doi: 10.1016/j.tripleo.2007.03.002. Epub 2007 Jul 25.
Three-dimensional computed tomography (CT) was used to investigate which skeletodental factors are related to chin point deviation of facial asymmetry in skeletal class III malocclusion (SCIII) patients.
Forty Korean adult female patients with SCIII, who had a three-dimensional CT taken 1 month before orthognathic surgical surgery, were assigned to group 1 (symmetry) or group 2 (asymmetry) according to the amount of chin point deviation from facial midline. Midfacial, mandibular, and cranial base variables were measured with software and statistically analyzed.
Group 2 showed higher positions of the upper canine and first molar, shorter ramus height, more superior-posterior positioning of gonion (Go) on the deviated side, and more mesial inclination of the ramus and medial positioning of Go on the opposite side.
Facial asymmetry in SCIII patients occurs due to greater growth and mesial inclination of the ramus and greater maxillary vertical excess in the opposite side.
采用三维计算机断层扫描（CT）来研究哪些骨骼牙齿因素与Ⅲ类骨性错牙合（SCIII）患者面部不对称的颏点偏斜有关。
40名韩国成年女性SCIII患者，在正颌手术前1个月进行了三维CT扫描，根据颏点偏离面部中线的程度分为1组（对称组）或2组（不对称组）。使用软件测量面中部、下颌骨和颅底变量，并进行统计分析。
2组显示上颌尖牙和第一磨牙位置更高，下颌升支高度更短，偏斜侧下颌角（Go）位置更上后，对侧升支更向近中倾斜且Go位置更偏内侧。
SCIII患者的面部不对称是由于升支生长和近中倾斜更大以及对侧上颌垂直向过度生长所致。
