Comparison of Color Stability of a Monochromatic Resin Versus Bulk-Fill and Micro-Hybrid Resins.

Abstract

Background: To compare the color stability of a monochromatic nano-hybrid resin, a Bulk-Fill nano-hybrid resin, and a micro-hybrid resin after exposure to three staining beverages.

Material and methods: A monochromatic nano-hybrid resin (Vittra APS Unique), a Bulk-Fill nano-hybrid resin (Filtek™ Bulk-Fill) and a micro-hybrid resin (Filtek™ Z250 XT) were used. Two hundred twenty-eight samples (8 mm x 2 mm discs) were manufactured. The samples were divided into four subgroups based on the type of staining beverage (Coffee, black tea, Coca-Cola). Distilled water was used as control. The initial color of the samples was recorded after 24 hours, as well as after 7 and 15 days of immersion. The color difference (ΔE) was calculated with the CIE2000 formula. The two-way ANCOVA test was used for the analysis, and the significance level was adjusted to 5%.

Results: A statistically significant interaction between beverage and resin types on ΔE values was observed while controlling for immersion time (p<0.001). In the analysis of the adjusted means, coffee and black tea primarily influenced the color change (ΔE) in the monochromatic resin, with values of 7.93 ± 1.90 and 6.93 ± 2.06, respectively. However, the most notable change was seen in the Bulk-Fill resin when exposed to Coca-Cola, which resulted in a ΔE value of 24.41 ± 0.41.

Conclusions: The monochromatic resin showed a greater color change than the micro-hybrid and Bulk-Fill resins when immersed in coffee and black tea. Conversely, the Bulk-Fill resin was more prone to discoloration when exposed to Coca-Cola. Key words:Resin, Chromatic stability, Spectrophotometry, Color perception, Carbonated beverages, Coffee, Tea.