1988 年 30 巻 3 号 p. 237-243
The profiles of the face and upper central incisor tooth surface are known to be similar. This study evaluated the accuracy of an image-analysis device, which was then used for quantitative analysis of facial and tooth profiles.
The device consisted of a CCD TV camera, a shade corrector, a video recorder, an image-analyzer (PIAS Co., Model LA-500) and a microcomputer (NEC Co., Model PC-9801 VX 2).
Squares (150mm×150mm and 10mm×10mm) and a metal coin (diameter 20 mm) were used for evaluation of the system's ability. The measurement procedures were as follows : 1) The squares and the coin were measured to obtain values of area and perimeter length, and 2) study models of 6 volunteers, 1 female and 5 males, between the ages of 25 and 30 years, were assessed by measurement of individual face and tooth profiles.
The average error rate was less than 5% for the squares and the coin. The average ratio of the long axis of the face to that of the tooth was 1/19, and that of the short axes 1/16.