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When the colors of the maxillary anterior teeth of 23 middle and 20 old-aged people were measured by spectroradiometer, with the aim of harmonizing the colors of the natural teeth in the manufacture of objects of prosthesis and when the results were compared and examined with the measurements of the same using the young people, the following conclusion was obtained. 1. Concerning the difference in different age groups, steady difference with the increase in age was recognized as conspicuously large among the middle aged and the young people-i.e. L* became lower and Cab* became higher. 2. Concerning the difference in colors in different teeth, the tendency of both L* and Cab* was the same among the young people and the middle-aged, while the tendency of Hab•‹among the middle-aged was the same as that among the aged except among a part of the middle-aged. 3. Concerning the color difference in the parts of the same tooth, on the other hand, the tendency was the same among all age groups—i.•@ e. L* was the highest at the middle part, Cab* was the highest at the cervical and Hab•‹ was the lowest at the cervical.

A study on the esthetic coloring of teeth by spectroradiometry. Concerning the maxillary anterior teeth of the middle and old aged people.