EC Dental Science

Background: Resin composites are among the tooth-colored restorative materials of choice for many dentists due to their excellent properties. Resin composites are increasingly used by dentists and only a few studies have evaluated the effect of commonly used beverages and medications on discoloration of resin composites.

Objective: The aim of this study was to evaluate color stability of two nanohybrid resin-based composite restorative materials Filtek Z250XT and Herculite XRV following immersion in black tea.

Materials and Methods: Thirty shade B2 cylindrical specimens were prepared from each resin composite according to the manufacturer's instructions using metal molds. Specimens were stored in distilled water for 48 hours at 37°C. The top surfaces of all specimens were wet-polished with silicon carbide papers, and then were randomly divided into two groups of 15 each. All specimens were measured for color values using a spectrophotometer (Testing Phase One-T1). Specimens in each group were immersed in black tea for one hour per day at 37°C for two weeks. Following completion of the immersion time, all specimens were measured for color (Testing Phase Two-T2) similar to testing phase one T1.

Results: The mean (± SD) ΔE values of Filtek Z250XT at baseline before immersion was 1.9 ± 1.1 and for Herculite XRV Ultra was 1.1 ± 0.7. There was no significant difference in ΔE* values between the two types of composite resins (P = 0.073). The mean (± SD) of ΔE values of Filtek Z250 XT after immersion in black tea was 26.3 ± 0.5 and for Herculite XRV Ultra was 25.1 ± 0.9. A statistically significant change in color for both resin composite materials was evident when comparing between ΔE* values testing phase T2/Stained and testing phase T1/Baseline (control) (P < 0.01). After being stained, no significant difference in ΔE values was found between both resin composite materials (P > 0.05).

Conclusion: Both tested resin composite restorative materials were susceptible to discoloration by black tea after immersion for 14 hours. There was no difference in the degree of discoloration between the two types of resin composites.

 Keywords: Spectrophotometry; Black Tea; Color Stability; Nanohybrid Resin Composite

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