Effect of surface sealant on the color stability and whiteness index of single-shade resin composites after staining and bleaching.

OBJECTIVES

The aim of the current study was to evaluate the effect of polishing systems and surface sealant on the color stability and whiteness index of single-shade resin composites after staining and bleaching.

MATERIALS AND METHODS

Three single-shade (Omnichroma, Charisma Diamond One, Zenchroma) and one multi-shade (Filtek Z250) materials were tested. From each resin composite, 40 specimens were prepared. The specimens were divided into 4 subgroups ( = 10) according to the surface treatments: 1-step polishing, 1-step + Biscover LV, 2-step polishing, and 2-step polishing + Biscover LV. Color differences (ΔE) were calculated after being immersed in the coffee solution for 12 days. After the staining, the specimens were immersed in a whitening mouthrinse (Crest-3D White) for 12 hours. Whiteness index differences (∆WI = WI after staining - WI after bleaching) values were recorded. The generalized linear model was used for analysis ( < 0.05).

RESULTS

The lowest and highest ΔE values were found for Zenchroma and Charisma Diamond One respectively. Sealed groups indicated higher ΔE values than nonsealed groups with significant differences ( = 0.008). The lowest and highest ΔWI values were found for Zenchroma and Charisma Diamond One respectively. Sealed groups indicated lower ΔWI values than nonsealed groups with significant differences ( = 0.022).

CONCLUSIONS

The use of surface sealant increased the discoloration and showed less whiteness change in resin materials. When the 1-step was compared with the 2-step polishing, the effects on the color stability and whiteness index values of the resin materials were similar.