Mao Xiaoyan, Fu Xi, Niu Feng, Chen Ying, Jin Qi, Qiao Jia, Gui Lai
From the Department of Craniomaxillofacial Surgery, Plastic Surgery Hospital, Chinese Academy of Medical Science, Peking Union Medical College, Beijing, People's Republic of China.
Ann Plast Surg. 2018 Jul;81(1):12-17. doi: 10.1097/SAP.0000000000001463.
Reduction gonioplasty is very popular in East Asia. However, there has been little quantitative criteria for mandibular angle classification or aesthetics. The aim of this study was to investigate the quantitative differences of mandibular angle types and determine the morphologic features of mandibular angle in attractive women.
We created a database of skull computed tomography and standardized frontal and lateral photographs of 96 Chinese female adults. Mandibular angle was classified into 3 groups, namely, extraversion, introversion, and healthy group, based on the position of gonion. We used a 5-point Likert scale to quantify attractiveness based on photographs. Those who scored 4 or higher were defined as attractive women. Three types of computed tomography measurements of the mandible were taken, including 4 distances, 4 angles, and 3 proportions. Discriminant analysis was applied to establish a mathematic model for mandibular angle aesthetics evaluation.
Significant differences were observed between the different types of mandibular angle in lower facial width (Gol-Gor), mandibular angle (Co-Go-Me), and gonion divergence angle (Gol-Me-Gor) (P < 0.01). Chinese attractive women had a mandibular angle of 123.913 ± 2.989 degrees, a FH-MP of 27.033 ± 2.695 degrees, and a Go-Me/Co-Go index of 2.0. The "healthy" women had a mandibular angle of 116.402 ± 5.373 degrees, a FH-MP of 19.556 ± 5.999 degrees, and a Go-Me/Co-Go index of 1.6. The estimated Fisher linear discriminant function for the identification of attractive women was as follows: Y = -0.1516X1(Co-Go) + 0.128X2(Go-Me) + 0.04936X3(Co-Go-Me) +0.0218X4(FH-MP).
Our study quantified the differences of mandibular angle types and identified the morphological features of mandibular angle in attractive Chinese female adults. Our results could assist plastic surgeons in presurgical designing of new aesthetic gonion and help to evaluate lower face aesthetics.
缩窄性下颌角整形术在东亚地区非常流行。然而，下颌角分类或美学方面几乎没有定量标准。本研究的目的是调查下颌角类型的定量差异，并确定有吸引力女性的下颌角形态特征。
我们创建了一个包含96名中国成年女性颅骨计算机断层扫描以及标准化正面和侧面照片的数据库。根据下颌角点的位置，将下颌角分为3组，即外向型、内向型和健康组。我们使用5点李克特量表根据照片对吸引力进行量化。得分4分及以上者被定义为有吸引力的女性。对下颌骨进行了三种类型的计算机断层扫描测量，包括4个距离、4个角度和3个比例。应用判别分析建立下颌角美学评价的数学模型。
不同类型下颌角在下颌面部宽度（Gol-Gor）、下颌角（Co-Go-Me）和下颌角点发散角（Gol-Me-Gor）方面存在显著差异（P < 0.01）。中国有吸引力的女性下颌角为123.913±2.989度，FH-MP为27.033±2.695度，Go-Me/Co-Go指数为2.0。“健康”女性下颌角为116.402±5.373度，FH-MP为19.556±5.999度，Go-Me/Co-Go指数为1.6。用于识别有吸引力女性的估计费希尔线性判别函数如下：Y = -0.1516X1（Co-Go）+ 0.128X2（Go-Me）+ 0.04936X3（Co-Go-Me）+0.0218X4（FH-MP）。
我们的研究量化了下颌角类型的差异，并确定了有吸引力的中国成年女性下颌角的形态特征。我们的结果可以帮助整形外科医生在术前设计新的美学下颌角点，并有助于评估下面部美学。
