Surrounding and background shades effect on color adjustment of single-shade composites

Abstract This study evaluated the effects of surrounding and background shades on the color adjustment potential (CAP) and visual color match of two single-shade composites, Vittra APS Unique and Charisma Diamond One. Cylinder-shaped specimens were constructed, consisting of either single-shade composites alone (simple) or composites surrounded by the Forma material at shades A1 or A3 (dual). Simple specimens using only the Forma at the specified shades were also prepared. Color measurements of simple specimens were taken against a gray background using a spectrophotometer. For dual specimens, the color of the inner composite was measured against a gray or chromatic (the same shade as the outer composite) background. Color differences (ΔE00) between the single-shade composites and the A1/A3 composite were calculated. CAP was determined by comparing data from simple and dual specimens. Four experienced dentists scored the color match (perfect to unacceptable) for each specimen using a viewing booth illuminated by an illuminant D65. Data were analyzed with repeated-measures ANOVA and the Kruskal-Wallis test. The results showed that both single-shade composites showed the lowest color discrepancies when they were compared to A1 and A3. Using a chromatic background only significantly affected the CAP when the outer composite was A3. The visual analysis showed poor color matches between the single-shade and control chromatic composites, except for Charisma Diamond One surrounded by A1. In conclusion, the CAP values of the evaluated single-shade composites were impacted by both surrounding shade and background color, and the color match of these materials tended to be poor. Resumo Este estudo avaliou os efeitos da cor do entorno e do fundo no potencial de ajuste de cor (PAC) e na correspondência visual de cor de dois compósitos monocromáticos, Vittra APS Unique e Charisma Diamond One. Amostras em formato cilíndrico foram criadas utilizando os compósitos monocromáticos e de cor A1/A3. Algumas amostras dos compósitos monocromáticos foram circundadas pelos compósitos A1 ou A3, formando amostras duplas. Medidas de cor das amostras simples foram obtidas em um fundo cinza utilizando um espectrofotômetro. Para as amostras duplas, a cor do compósito interno foi medida em um fundo cinza ou cromático (com a mesma cor do compósito externo). As diferenças de cor (ΔE00) entre os compósitos de monocromáticos e os compósitos A1/A3 foram calculadas. O PAC foi determinado compar