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Color stability of bulk-fill resin composites exposed to caffeinated beverage: An in vitro study
1Department of Restorative Dentistry, Faculty of Dentistry, Trakya University, Edirne, Turkey, esraozyurt@trakya.edu.tr.
Purpose:
To evaluate the in vitro color stability and surface properties of bulk-fill resin composites after exposure to coffee and cola.
Methods:
Color stability was evaluated in a conventional resin composite (Filtek Z250) and three bulk-fill resin composites (Filtek One Bulk Fill, Tetric N-Ceram Bulk Fill, and Beautifil Bulk Fill as giomer). Color change (CIEDE 2000 ΔE₀₀) was calculated after 12 days of immersion in distilled water (control), coffee, or cola (Diet Coke). Water sorption (%Wsp) and solubility (%Wsl) ratios were calculated for each material in each solution. One sample of each material from each condition was observed with scanning electron microscopy and atomic force microscopy. Generalized linear modeling and Bonferroni correction were used for ΔE₀₀ value analysis. One-way ANOVA and Kruskal Wallis tests were performed to analyze %Wsp and %Wsl ratios.
Results:
Tetric N-Ceram Bulk Fill showed the highest ΔE₀₀ value in distilled water. Beautifil Bulk Fill had the highest ΔE₀₀ value in coffee and cola. Beautifil Bulk Fill had the highest %Wsl ratio. Filtek One Bulk Fill and Tetric N-Ceram Bulk Fill had the highest and lowest %Wsp ratios, respectively. Coffee and cola exposure had surface property-disrupting and discoloration effects on both conventional and bulk-fill resins.
Clinical Significance:
Acidic beverages could negatively affect the surface properties of bulk-fill and conventional resin composites. The usage of the giomer composite might have disadvantages in terms of esthetics.
