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Title: Correlations between color differences based on three color-difference formulas using dental shade guide tabs.
Author: Kim JG, Yu B, Lee YK.
Journal: J Prosthodont; 2009 Feb; 18(2):135-40. PubMed ID: 19054306.
Abstract:
PURPOSE: The purpose of this study was to determine the correlation among color-difference values based on three formulas between shade tab pairs from two shade guides [Vita Lumin (VITA) and Chromascop (CHRO)]. MATERIALS AND METHODS: The color of shade tabs was measured relative to the standard illuminant D(65) under the 8 degrees standard observer function, and distributions for CIE L*, a*, and b* values were compared. One hundred and twenty shade pairs from VITA and 190 shade pairs from CHRO were used to calculate color differences using CIELAB, DIN99, and CIEDE2000 formulas (DeltaE*(ab), DeltaE(99), and DeltaE(00), respectively). A paired t-test was used to determine the difference between each pair of the three color-difference values (alpha= 0.01). Regression analysis was used to determine the correlations between the color differences (alpha= 0.01). RESULTS: For both shade guides, there were significant differences between DeltaE*(ab) and DeltaE(00), DeltaE*(ab) and DeltaE(99), and DeltaE(99) and DeltaE(00) (p < 0.01). DeltaE*(ab) and DeltaE(00), and DeltaE*(ab) and DeltaE(99) were strongly correlated (r(2)= 0.90 to 0.94, p < 0.05). Although a simplified a* rescaling function of the CIE a* axis has been added in the CIEDE2000 formula, the influence of the opposite signs in the a* value were found to be irrelevant to the DeltaE(00) value. CONCLUSION: DeltaE*(ab),DeltaE(99), and DeltaE(00) can be used interchangeably for the evaluation of color difference of shade tabs.

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