Some chemical compounds resulting from liquids foods, oral mouthwash and bleaching agents may result in color change of resin composites. Information about the effect of these solutions in these materials is still limited. Thus, the objective of this study will evaluate the effects of using food dyes, mouthwash and bleaching about the color stability of resin composites. Five different brands of resin composites will be evaluated: Adoro, Resilab, Cristobal, Sinfony and Epricord. For each type of composite laboratory, 10 samples will be submitted to eleven types of solutions, with four liquids foods (cola, wine, coffee, orange juice), 4 oral mouthwash (Listerine, Oral-B, Plax, Periogard), 3 bleaching agents (Caramia Peroxide 16% Hydrogen Peroxide 7.5% and 38%) and artificial saliva (control). The color readings will be performed using a reflection spectrophotometer through the CIELaB system. The color change of the samples will be evaluated in an initial period, ie before immersion in solutions and after 7, 14 and 21 days in liquid foods; and after 12, 24, 36 and 60 hours of immersion in oral mouthwashes; and after 7 and 14 days in the bleaching agent. The data will obtained be submitted to the test of adherence to the normal curve, being applied appropriate statistical test for comparing the average values of color change of the samples.
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