Intrinsic and extrinsic discoloration of dimethacrylate and silorane based composites

Objective: The purpose of this study was to evaluate the intrinsic and extrinsic color change of dimethacrylate and silorane-based composites. Materials and methods: Five contemporary composites were included within the study (Filtek LS Low Shrink Posterior Restorative [SIL], Filtek SupremeXT [SPR], Filtek Z250 [Z25], Filtek P60 [P60], and Admira [ADM]). Twenty-five specimens (8-mm diameter, 1.5-mm thickness) were prepared for each composite. After baseline color measurements were taken, specimens were immersed in 4 staining solutions (red wine, coffee, cola, and tea) or distilled water (n = 5). After a 24-h and 1-month immersion, the color values of each specimen were remeasured and the color change values (Delta E-ab*) were calculated. Statistical analyses were evaluated by one-way ANOVA and Tukey HSD test. Results: Amongst the solutions, red wine had the highest Delta E-ab* value in all the composite restoratives. After the final measurement, ADM exhibited the lowest discoloration, whereas SPR exhibited the highest color change. Additionally, the color change for SIL after 1 month in distilled water was higher than the clinically accepted cut-off of 3.3. This change was correlated with an increasing L value according to the multiple regression analysis. Conclusion: All of the restorative materials used in this study were susceptible to staining by commonly consumed beverages drinks, especially red wine and coffee; however, in water, only SIL became whiter with time. (C) 2011 Elsevier Ltd. All rights reserved.