Abstract
ObjectivesThe purpose of this study was to assess the color change of three types of composite resins exposed to coffee and cola drink, and the effect of repolishing on the color stability of these composites after staining.Materials and MethodsFifteen specimens (15 mm diameter and 2 mm thick) were fabricated from microhybrid (Esthet-X; Dentsply and Filtek Z-250; 3M ESPE) and high-density hybrid (Surefil; Dentsply) composites, and were finished and polished with aluminum oxide discs (Sof-Lex; 3M ESPE). Color of the specimens was measured according to the CIE L*a*b* system in a reflection spectrophotometer (PCB 6807; BYK Gardner). After baseline color measurements, 5 specimens of each resin were immersed in different staining solutions for 15 days: G1 - distilled water (control), G2 - coffee, G3 - cola soft drink. Afterwards, new color measurement was performed and the specimens were repolished and submitted to new color reading. Color stability was determined by the difference (∆) between the coordinates L*, a*, and b* obtained from the specimens before and after immersion into the solutions and after repolishing.ResultsThere was no statistically significant difference (ANOVA, Tukey's test; p>0.05) among the ∆ values for the different types of composites after staining or repolishing. For all composite resins, coffee promoted more color change (∆>3.3) than distilled water and the cola soft drink. After repolishing, the ∆ values of the specimens immersed in coffee decreased to clinically acceptable values (∆<3.3), but remained significantly higher than those of the other groups.ConclusionsNo significant difference was found among composite resins or between color values before and after repolishing of specimens immersed in distilled water and cola. Immersing specimens in coffee caused greater color change in all types of composite resins tested in this study and repolishing contributed to decrease staining to clinically acceptable ∆ values.
Highlights
The problem of composite resin color change is well acknowledged by dentists5
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Summary
The problem of composite resin color change is well acknowledged by dentists. An esthetic restoration with an unacceptable color is the main cause for replacement of anterior tooth restorations. Color change usually occurs due to three reasons: 1) external discolorations due to accumulation of plaque and stains; 2) alterations on the surface or subsurface, promoting surface degradation and slight penetration and reaction of staining agents with the composite surface (adsorption); 3) intrinsic discolorations due to physicochemical reactions in the deep portions of the restoration. Composite structure and the characteristics of WKH LQRUJDQLF ¿OOHUV KDYH D GLUHFW LPSDFW RQ UHVLQ surface smoothness and susceptibility to extrinsic staining. In addition to the material’s composition, ¿QLVKLQJ DQG SROLVKLQJ SURFHGXUHV PD\ LQÀXHQFH WKH quality of the composite surface and can be related to the early discoloration of resins.
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