Effects of Orange Juice and Tea on Color Stability of Polyetheretherketone, Polymethyl Methacrylate, and A Composite Resin

Abstract

Objectives: This study aimed to assess the effects of orange juice and tea on color stability of polyetheretherketone (PEEK), polymethyl methacrylate (PMMA), and a composite resin. Materials and Methods: In this in vitro, experimental study, 45 disc-shaped specimens with 1 mm thickness and 15 mm dimeter were fabricated from PEEK, PMMA and Crea.lign composite resin (n=15 from each). The baseline color parameters of the specimens were measured by a spectrophotometer according to the CIE L*a*b* color space. The specimens were then immersed in orange juice, distilled water and tea at 37°C for 2 h/day for 30 days, and their color parameters were measured again. The color change (ΔE) of specimens was calculated and analyzed using one-way and repeated measures ANOVA and Tukey’s test. Results: According to one-way ANOVA, type of restorative material had no significant effect on ΔE (P=0.113) but type of coloring solution significantly affected the ΔE (P<0.001). The interaction effect of type of restorative material and type of solution on ΔE was not significant (P=0.731). Color change of specimens in distilled water and orange juice was < 2.7 and not clinically perceivable; however, ΔE of specimens in tea solution was > 5, and clinically detectable. Conclusion: Within the limitations of this in vitro study, it appears that type of coloring solution has a more prominent effect on color stability than the type of material since the three tested materials showed comparable color stability. Tea can cause clinically detectable color change in all tested materials.