Choi Jin-Young, Kim Taeyun, Kim Hyung-Mo, Lee Sang-Hoon, Cho Il-Sik, Baek Seung-Hak
Department of Oral and Maxillofacial Surgery, School of Dentistry, Seoul National University, Seoul, Korea.; Dental Research Institute, Seoul National University, Seoul, Korea.
Department of Oral and Maxillofacial Surgery, School of Dentistry, Seoul National University, Seoul, Korea.
Korean J Orthod. 2017 Mar;47(2):108-117. doi: 10.4041/kjod.2017.47.2.108. Epub 2017 Jan 25.
To investigate the effects of frontal facial type (FFT) and sex on preferred chin projection (CP) in three-dimensional (3D) facial images.
Six 3D facial images were acquired using a 3D facial scanner (euryprosopic [Eury-FFT], mesoprosopic [Meso-FFT], and leptoprosopic [Lepto-FFT] for each sex). After normal CP in each 3D facial image was set to 10° of the facial profile angle (glabella-subnasale-pogonion), CPs were morphed by gradations of 2° from normal (moderately protrusive [6°], slightly protrusive [8°], slightly retrusive [12°], and moderately retrusive [14°]). Seventy-five dental students (48 men and 27 women) were asked to rate the CPs (6°, 8°, 10°, 12°, and 14°) from the most to least preferred in each 3D image. Statistical analyses included the Kolmogorov-Smirnov test, Kruskal-Wallis test, and Bonferroni correction.
No significant difference was observed in the distribution of preferred CP in the same FFT between male and female evaluators. In Meso-FFT, the normal CP was the most preferred without any sex difference. However, in Eury-FFT, the slightly protrusive CP was favored in male 3D images, but the normal CP was preferred in female 3D images. In Lepto-FFT, the normal CP was favored in male 3D images, whereas the slightly retrusive CP was favored in female 3D images. The mean preferred CP angle differed significantly according to FFT (Eury-FFT: male, 8.7°, female, 9.9°; Meso-FFT: male, 9.8°, female, 10.7°; Lepto-FFT: male, 10.8°, female, 11.4°; < 0.001).
Our findings might serve as guidelines for setting the preferred CP according to FFT and sex.
研究三维（3D）面部图像中额面部类型（FFT）和性别对理想颏部突度（CP）的影响。
使用3D面部扫描仪采集6张3D面部图像（每种性别各有3种：阔面型[Eury-FFT]、中面型[Meso-FFT]和窄面型[Lepto-FFT]）。将每张3D面部图像中的正常CP设定为面部轮廓角（眉间点-鼻下点-颏前点）的10°后，CP以2°的梯度从正常（中度前突[6°]、轻度前突[8°]、轻度后缩[12°]和中度后缩[14°]）进行变形。75名牙科专业学生（48名男性和27名女性）被要求对每张3D图像中从最理想到最不理想的CP（6°、8°、10°、12°和14°）进行评分。统计分析包括柯尔莫哥洛夫-斯米尔诺夫检验、克鲁斯卡尔-沃利斯检验和邦费罗尼校正。
在相同FFT中，男性和女性评估者对理想CP的分布没有显著差异。在中面型FFT中，正常CP是最理想的，且无性别差异。然而，在阔面型FFT中，轻度前突的CP在男性3D图像中更受青睐，但正常CP在女性3D图像中更受青睐。在窄面型FFT中，正常CP在男性3D图像中更受青睐，而轻度后缩的CP在女性3D图像中更受青睐。理想CP角的平均值根据FFT有显著差异（阔面型FFT：男性为8.7°，女性为9.9°；中面型FFT：男性为9.8°，女性为10.7°；窄面型FFT：男性为10.8°，女性为11.4°；<0.001）。
我们的研究结果可能为根据FFT和性别设定理想CP提供指导。
