Methods: 334 CR samples with thicknesses of 0.5; 1; 1.5 e 2mm were fabricated and the primary chromatic properties of different opacities (enamel, dentin, body) of Filtek Supreme XTE (3M ESPE-Seefeld, Germany) and the Vitapan Classical shade guide, both under white and black background were recorded. For the different shades tested the spectrophotometer VITA Easyshade Master (Vita) was used to establish values for each of the color components, based on the coordinates L* a* b* of the Comission Internationale de l’Éclairage (CIE), as well as the values of chroma, hue and value. As a comparison group, the VSG was used. Statistical analysis was performed using one-way ANOVA test, followed by Tukey HSD with p≤0.05 (SPSS 20.0, SPSS Inc.)
Results: The maximum ΔE 36.65 matches the color of A3 (dentin) with 1mm thickness and the minimum value of ΔE was found to color A1 (enamel) to 2mm thickness (both subjected to white background). For the total change of color, there is a greater accuracy between the VSG and the body CR, when analyzed under black background. When analyzed under white background, the biggest accuracy is between the VSG and enamel CR. However, there are few colors that are statistically similar to VSG.
Conclusion: There is a significant difference of the primary chromatic properties between VSG and the CR. Only the thicknesses of 0.5, 1.5 and 2mm are similar between CR and VSG to the total change of color (ΔE). For the parameter L*, only the enamel RC corresponds to the VSG.