Color difference of all-ceramic materials by the change of illuminants

Purpose: To determine the differences in color and color parameters (lightness, chroma and hue) of simulated layered all-ceramic specimens at a clinically relevant thickness Under three CIE standard illuminants. Methods: Seven all-ceramic core materials of A2-corresponding shade, one sintering ceramic and one alloy core as references were prepared in clinically relevant thicknesses (0.4 to 0.8 mm). A2- and A3-corresponding shades of each of the recommended veneer ceramics were fabricated so that the thickness of the layered specimens was 1.5 mm. Bovine dentin was also used as a reference. Color was measured relative to the CIE standard illuminants D-65 A and F2 with a reflection spectrophotometer. Differences in color and color parameters by the change of illuminants Were calculated. Repeated measures two-way ANOVA with the fixed factor of the brand of ceramics oil the difference in color and color parameters by the change of illuminants (D-65 to A, D-65 to F2 and A to F2) was performed (alpha=0.05). Results: Color difference (Delta E*(ab)) was in the range of 0.6 to 0.8 for bovine dentin, 1.3 to 3.4 for A2-veneer layered specimens and 1.6 to 4.2 for A3-veneer layered specimens. Differences in color and parameters were significantly influenced by the brand of the ceramics and the combination of illuminants (P < 0.05). (Ant J Dent 2009,22:73-78).