In order to develop a system whereby facial form could be expressed quantitatively, we studied scans taken with a non-contact three-dimensional system (VIVID 900, Minolta, Japan). When we compared a person's face at rest with that when his teeth were occluded, we found that there was a significant difference between the left and right sides (p<0.05). This difference was primarily caused by the masseter muscles. Based on these results, we concluded that our system could be used to quantitatively analyze the human face.
