Estimate of the Original Gingival Color in Reflection Spectrum Data of Redness Gingiva by Multiple Regression Analysis

This study was made to examine if original gingival color of an individual patient in healthy condition can be presumed from the observed data on the color of his gingiva having presented pericoronal gingival redness. The subjects were 50 males (aged 23-31) whose gingivae have been identified as clinically healthy. X, y, V, Bl and f values were determined from raw data obtained by the color measurement of 4 gingival spots near the cervical regions of maxillary central and lateral incisors. Multiple regression analysis was made with x, y and V values of the healthy papillary gingiva as objective variable and with each element of the observed data (twenty-dimensional observed value vector) upon the manifestation of gingival redness, which has bi-graded according to the degree of redness (slight redness, redness), as explanatory variable. As a result, the analysis of a bi-graded observed data series according to the degree of gingival redness was confirmed to make it possible to presume the original gingival color of the papillary part in healthy condition, suggesting the usefulness for its clinical application.