Abstract
This study aimed to evaluate the effect of a bleaching agent on the color of extrinsically pigmented indirect composite resins. Samples of five resins (Adoro, Resilab, Cristobal, Sinfony, Epricord) were manufactured and divided into five groups: red wine, coffee, orange juice, Coca-Cola, and artificial saliva (control). The stained samples were immersed in a 38% hydrogen peroxide solution for 30 min per week, over three weeks. Color readings were performed at the initial state (L0), after 21 days of dye immersion (ΔE1, L1), and after 7 (ΔE2, L2), 14 (ΔE3, L3), and 21 days (ΔE4, L4) of bleach immersion. Data were subjected to ANOVA and Tukey’s honestly significant difference (HSD) test (α = 0.05). The color alteration was greater in ΔE1, regardless of color solution, indicating extrinsic pigmentation. The Resilab group exhibited greater ΔE1 values than the other resins. The bleaching agent promoted bleaching action on the surfaces of the materials studied, removing the previously impregnated pigments.
Highlights
IntroductionDental procedures that involve esthetics, such as restorations with composite resins and bleaching treatments, are under constant development [1]
It was observed that interactions between the type of resin, the staining solution
The color alteration was greatest at ∆E1, regardless of the staining solution and the composite
Summary
Dental procedures that involve esthetics, such as restorations with composite resins and bleaching treatments, are under constant development [1]. The chromatic alteration of composite resins can be caused by intrinsic or extrinsic factors. The intrinsic factors are related to chemical and physical reactions in the deepest portions of the restoration, in addition to changes in temperature and humidity. The extrinsic factors are related to the adsorption or absorption of colored substances. The presence of hydrophilic particles within the resinous matrix, with the capacity to absorb water, and the size and distribution of the particles could provoke chromatic alterations of the restoration [2,3]
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