Effects of orthognathic surgery on facial expressions

1998 Fiscal Year Final Research Report Summary

• Project/Area Number: 09672098
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: 矯正・小児・社会系歯学
• Research Institution: Niigata University
• Principal Investigator: TERADA Kazuto Niigata University, Dental Hospital, Associate Professor, 歯学部附属病院, 助教授 (00139312)
• Co-Investigator(Kenkyū-buntansha): MORISHIMA Shigeo Seikei University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (10200411)
• Project Period (FY): 1997 – 1998
• Keywords: Orthognathic surgery / Facial expression / Face model / Jaw defomity / Simulation / Rehabilitation

Research Abstract

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.