Abstract
The aim of this in vitro study was to evaluate the color stability of a bulk-fill (Filtek One Bulk Fill, 3M ESPE) and a conventional (Filtek Z350 XT, 3M ESPE) composite resin light-cured at different distances, before and after being submitted to staining with a coffee solution. Sixty specimens of each composite resin were prepared and light-cured at distances of 0, 2 and 4 mm, using a LED light-curing unit (Valo, Ultradent). The specimens were separated (n = 10) for immersion in either distilled water or coffee solution (10 minutes a day for 8 days) to stimulate staining. Color evaluations were performed before and after immersion in the solutions, according to CIELab (△Eab), CIEDE2000 (△E00) and the Whiteness Index for Dentistry (△WID). Kruskal Wallis and Dunn tests, Mann-Whitney tests and Wilcoxon test were applied (α = 5 %). The a* value for conventional composite resin showed a significant increase after immersion in coffee and distilled water (p < 0.05). Both composite resins showed greater b* values when immersed in coffee than in distilled water, with no significant difference among the light-activation distances (p > 0.05). There was no significant difference for L* among the light-activation distances; both resins showed significant decrease in L* after immersion in coffee (p < 0.05). Color change (△Eab, △E00) and difference in whiteness (△WID) were higher for conventional resin when immersed in the coffee solution at all the light-activation distances. Conventional composite resin presented a higher staining value than bulk-fill composite resin, regardless of the light-activation distance.
Highlights
Composite resins have become the material of choice for aesthetic restorations, because they have the physical properties that reproduce the natural-looking beauty of teeth.[1]
An increase in the a* value occurred in the bulk-fill resin only when it was immersed in coffee (p
Conventional composite resin presented less negative or more positive values after immersion in water or coffee, respectively, than bulk-fill resin, except at a distance of 4 mm when immersed in coffee
Summary
Composite resins have become the material of choice for aesthetic restorations, because they have the physical properties that reproduce the natural-looking beauty of teeth.[1] In this respect, color stability is of utmost importance, since the staining of restorations by dyes of food and beverage consumption can impair their quality and aesthetic longevity.[2,3,4,5,6,7,8]. Composite resin staining may occur due to extrinsic and intrinsic factors. The color change of the restoration from the oxidation of tertiary amines, the polymeric matrix, or the oxidation of residual methacrylate groups can be pointed out. These factors are dependent on the formulation and the quality of the light-activation of
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