The Journal of Nihon University School of Dentistry
Online ISSN : 1884-2984
Print ISSN : 0029-0432
ISSN-L : 0029-0432
Application of an Image-analysis System to Prosthodontics
Measurements of Human Facial Profiles and Upper Central Incisor Teeth
佐藤 吉則木村 一之大木 一三
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1988 年 30 巻 3 号 p. 237-243

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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.

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