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Comparative Evaluation of Color Stability in Nanohybrid and Microhybrid Composites Exposed to Misswake Mouthwash: An
Parisa Bazin1, Shadab Safarzadeh Khosroshahi2, Saeedeh Ebrahimgol3
1Doctor of Dental Surgery, Independent General Dentist, Tehran, Iran.
Objective:
This study aimed to evaluate the color stability of various restorative materials after immersion in one commercial mouthwash.
Materials And Methods:
Twenty-four samples from two composite resin systems (Denfil and Voco) and their flowable counterparts (Denfil Flow and Voco Grandio Flow) were exposed to Misswake Total Care mouthwash. Color measurements (L ∗ , a ∗ , b ∗ ) were taken before and after immersion using a spectrophotometer, and color differences were calculated according to CIE76 (ΔE76) and CIEDE2000 (ΔE 00) formula. Data were analyzed using two-way ANOVA (α = 0.05).
Results:
All composite groups exhibited color changes after immersion in the mouthwash. Denfil Flow showed the highest mean ΔE 00 (1.11 ± 0.29), followed by Denfil (1.09 ± 0.33), Voco Grandio Flow (0.97 ± 0.20), and Voco Grandio (0.66 ± 0.17). A significant difference was observed between Denfil and Voco groups (p < 0.05), whereas flowable and packable types within the same brand did not differ significantly. All ΔE values remained below the clinically perceptible threshold (ΔE < 3.3).
Conclusion:
Nanohybrid composites demonstrated greater resistance to discoloration than microhybrid composites. Although Misswake Total Care mouthwash induced measurable color changes, these changes remained within clinically acceptable limits. The immersion period used in this study corresponds to approximately 2 years of daily use, suggesting that the product is unlikely to cause clinically relevant discoloration over this timeframe.
