Effects of orthognathic surgery on facial expressions

本研究的目的是利用计算机系统研究正颌手术对面部表情的影响，并研究治疗后面部表情的训练系统。面部表情被定义为一般三维人脸模型中网格点的移动。一个人的正面面部图像被手动调整为通用模型。根据面部动作编码系统中的动作单元，从正颌手术前后的面部图像中产生六种表情(惊讶、恐惧、厌恶、愤怒、快乐和悲伤)。42名受试者估计了他们的表情。治疗后的面部图像产生的惊讶、恐惧和厌恶比治疗前更深刻。通过该系统，用户将自己的面部表情与通过该系统从用户的额面图像产生的面部表情进行比较，这对于面部表情的训练是有用的。本研究建议研究正颌手术对面部表情变化的影响。

The purpose of the present study was to investigate the effects of orthognathic surgery on facial expression by using a computer system, and to examine a training system for facial expression after treatment.A facial expression is defined as a movement of grid points in a generic three dimensional face model. A personal frontal face image was manually adjusted to a generic model. Facial expressions of a personal facial model could be produced according to Action Units on Facial Action Coding System.Six expressions (Surprise, Fear, Disgust, Anger, Happiness and Sadness) were produced from facial images before and after orthognathic surgery. Forty-two subjects estimated their expressions. Surprise, Fear and Disgust produced from a facail image after the treatment impressed deeply than before the treatment.It is useful to train for facial expressions, as a user shows and compares own facial expressions with facial expressions produced from user's frontal face image by this system.The present study was suggested to study the effect of orthognathic surgery on changing facial expressions.