Effect of Tea on Color Change of Silorane and Methacrylate based Composite Resins

بررسي اثر چاي بر تغيير رنگ كامپوزيت‌هاي سايلوران و متاكريلات بيس

Abstract Background and Aim: At present, stainability and color instability of tooth-colored res-torations following the consumption of colored beverages are among the problems com-monly encountered in restorative dentistry. Filtek P90 composite resin comprising of Oxi-rane and Siloxanefunctional moietieswas recently introduced aiming at reducing the po-lymerization shrinkage. The aim of this study was to evaluate the effect of tea on color change of P90 and Z250 composite resins using spectrophotometry. Materials and Methods: For this experimental study, 20 composite discs were fabricated in metal molds from Z250 and P90 composite resins and light cured using LED light-curing unit. Specimens were stored in distilled water at 37?C for 24 hours to allow com-pletion of polymerization. Color of specimens was then measured at baseline and after 5 days of storage in water and tea solution using spectrophotometer. Data were analyzed using independent sample t-test and two-way ANOVA. Results: The color change of P90 and Z250 composites after storage in distilled water was not significant in comparison to their baseline color (P > 0.05). However, both compo-site resins showed a significant change in color after storage in tea solution (P < 0.05). Stainability of Z250 composite in tea was significantly greater than that of P90; but in distilled water P90 showed greater color change than Z250. Conclusion: Within the limitations of this study, Z250 composite demonstrated signifi-cantly greater color change in comparison to P90 after immersion in tea solution. Key Words: Low-shrinkage composite resin , color stability , stainability , spectrophoto-meter