上下顎前歯の色彩学的研究
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概要
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Complete color matching has not always been attained in porcelain or crown bridge resin work. It may be partly due to the lack of the knowledge for general concept of natural tooth color. To overcome this problem and give a useful suggestion for reproduction of more satisfactory color harmony in the mouth, it would be important to examine the color distribution in each natural tooth and intertooth. In the present paper, upper and lower anterior teeth in the mouth were analyzed colorimetrically with use of the fiber colorimeter. Measurments were taken through the fiber detector of 2 mm in diameter on three regions for each tooth : incisal, middle and cervical portions. Forty-five males and 43 females, aged from teens to eighties, were chosen as the subjects for this study. The color was expressed by percent luminous reflectance, Y, and chromaticity coordinates, x and y. The ranges of color obtained were shown by 35.7≦Y≦38.4, 0.327≦x≦0.334 and 0.332≦y≦0.335 for the upper anterior teeth, and 35.2≦Y≦39.0, 0.327≦x≦0.334 and 0.332≦y≦0.336 for the lower. Y value decreased with an increase in age, resulting in certain visual difference in tooth color among subjects by age, although no significant changes were found statistically in x and y values. There could be seen some difference in luminous reflectance between upper and lower anterior teeth. It appeared most frequently in middle age, in which the upper teeth were slightly lighter than the lower. In the young and the old, however, the differences showed no definite tendency as in the middle. No or little differences were detected in color between right and left anterior teeth or between male and female. The value of color difference was also determined by the formula of CIE 1964 U^*V^*W^* using the data obtained from the colorimeter. The value showed a wide variety on each tooth or intertooth, especially in younger group. As the age increased, on the contrary, the cases having approximately the little value of color difference increased among the central and lateral incisors and canine as well as among the incisal, middle and cervical regions for each tooth.
- 1981-01-25
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