Effect of Beverages on Discoloration of the Anterior Resin Composites

Objectives: To evaluation the discoloration of microhybrid and nanofilled anterior resin composite upon exposure to different beverages and their onset of color change under controlled environment. Methods: Two types of anterior resin composite (microhybrid = Z100 and nanofilled = Z 350, 3M ESPE) and 4 types of beverages (drinking water, coffee, green tea and soft drink) were used in this study. Forty square-shaped specimens (10x10x2mm) of resin composite (Z100 = 20, Z350 = 20) were fabricated and initially stored in artificial saliva at 37 ° C for 3 days. Afterwards, the specimens were divided into 8 groups (n=5) according to types of resin composite and beverages. During experimental period, specimens was submitted to 15 minutes immersion in the beverages 3 times daily intercalated by immersions in artificial saliva. The color of each specimens was determined by taking photograph with digital camera, Nikon coolpix 4500, under light controlled environment on the beginning, 1, 2, 3, 4, 7, 14, 21 day of experimental period and saved in JPEG file interchange format (JPG). Color analysis of each photograph was performed by using Adobe photoshop version 7.0 CS to evaluated red, green, blue (RGB) and luminosity (L). Subsequently, calculated the displacement of color from the beginning to the day of photograph taken (DE). Ultimately, data were analyzed by using two-way ANOVA. Results: The interaction of beverages and resin composites was statistically significant (p<0.05) effect to the discoloration of specimens. The highest color difference was observed in the coffee groups followed by the green tea groups (p<0.05), while the drinking water and cola groups were not significant difference in color change. Z350 showed significant more discoloration than Z100. Conclusions: The staining of the anterior resin composite depending on the type of the beverages and classification of the resin composites.