Color Stability and Gloss of Esthetic Restorative Materials after Chemical Challenges

Abstract This study evaluated gloss and color changes of esthetic restorative materials subjected to different acidic beverages. Specimens of resin composites (Z350XT (Z350), IPS Empress Direct (ED), Charisma Diamond (CD)) were prepared and the initial surface gloss and color (ΔE) were measured (n=10). Then, the specimens were immersed in 4 mL of each of the different beverages (cranberry juice; Coca-Cola; coffee or artificial saliva) during 15 min, 3x/day for 14 days and new gloss and color readings were obtained. Color change was evaluated with the ΔE formula and gloss change values were obtained by the formula: (final gloss - initial gloss). Data was submitted to two-way ANOVA followed by Tukey’s post hoc test (a=0.05). CD showed the lowest color change among resin composites. The highest ΔE values were obtained after immersion in coffee and cranberry juice. Coffee promoted the highest gloss change (worst gloss retention), followed by cranberry juice, Coca-cola and artificial saliva (p<0.05). The type of beverage significantly influenced the gloss of resin composites. Coca-cola reduced gloss of the three resin composites in a similar manner. Coffee affected the ED gloss more than that of Z350 and CD, while cranberry juice affected Z350 more than ED and CD. Saliva had a more pronounced effect on the gloss retention of CD than ED. The beverages used in this study influenced the optical surface properties of the composites studied.摘要 本研究评估了不同酸性饮品作用下美学修复材料的光泽度与颜色变化。制备了树脂复合材料试样（Z350XT（Z350）、IPS Empress Direct（ED）、Charisma Diamond（CD）），并测量其初始表面光泽度与颜色ΔE（样本量n=10）。随后将试样分别浸没于4mL不同饮品（蔓越莓汁、可口可乐、咖啡或人工唾液）中，每日浸泡3次、每次15分钟，持续14天，之后再次获取光泽度与颜色读数。颜色变化采用ΔE公式进行评估，光泽度变化值通过公式（最终光泽度-初始光泽度）计算得到。数据采用双因素方差分析（two-way ANOVA），随后进行Tukey事后检验（显著性水平α=0.05）。在受试树脂复合材料中，CD的颜色变化最小。经咖啡与蔓越莓汁浸泡后，ΔE值最高。咖啡引发的光泽度变化最大（光泽保留性能最差），其次依次为蔓越莓汁、可口可乐与人工唾液（p<0.05）。饮品类型对树脂复合材料的光泽度具有显著影响。可口可乐对三种树脂复合材料的光泽度降低效果相似。咖啡对ED光泽度的影响大于Z350与CD，而蔓越莓汁对Z350的影响大于ED与CD。唾液对CD光泽保留性能的影响较ED更为显著。本研究所用饮品会影响受试复合材料的光学表面性能。