Abstract
Gingival color gives important information for the diagnosis of periodontal disease. However, it is not easy to use gingival color as objective data because color is dependent many factors.
We propose a Color Discrimination Index (CDI) based on three-band photometry with colorfilm, the index is independently determined from many factors such as the light conditions to avoid the difficulties reported previous paper.
In this study, the CDI was used to measure the gingival color of fourty one people with healthy teeth. The CDI of five portions of the inter dental papilla and six portions of the marginal gingiva to 3_??_3 of the upper part in each subject was measured.
The xy chromaticity coordinates of those parts were also measured and compared with the CDI.
The xy chromaticity coordinates on the color film were affected by the cosine law and other illuminant conditions since an oral eye camera was used to take pictures. On the other hand, the CDI is not influenced by those factors as shown in previous experiments. It became evident that the CDI is far better than the traditional xy chromaticity coordinates measuring gingival color.
