BG exhibited the highest R2 values between color coordinate pairs and between whiteness and yellowness indices with the respective color coordinates.īG exhibited the widest color range and had the most consistent color distribution as compared with the two commercial products. Mean values of DeltaE* among pairs of adjacent tabs were 3.0 (BG), 4.2 (VC), and 3.3 (TB).
The range of color difference (DeltaE*) from the lightest to the darkest tab was 33.8 (BG), 17.1 (VC), and 23.2 (TB). Data were analyzed by analysis of variance and Fisher's PLSD test at a 0.05 level of significance. Whiteness and yellowness indices were computed. A circular area (d=1.7 mm) on the middle of the labial surface of the tab, excluding the cervical portion, was measured with a spectroradiometer (D65, 2). The objective of this study was to perform a colorimetric analysis of a new shade guide designed primarily for the visual evaluation of tooth whitening efficacy and to compare this shade guide with two commercial shade guides.Ĭolor ranges and color distribution of three shade guides (prototype of the new Vita Bleachedguide 3D-Master, value scale of Vitapan Classical, and color-ordered Trubyte Bioform porcelain shade guide ) were analyzed (N=3). Available shade guides lack colorimetric uniformity, which compromises the validity of visual evaluation of tooth whitening efficacy.
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