Color recovery effect of commercial mouth rinses on a discolored composite.

STATEMENT OF THE PROBLEM

Several mouth rinses promising whiter smiles are on the market today.

PURPOSE

The aim of this study was to investigate the in vitro color recovery effects of six commercial mouth rinses on a stained universal composite resin.

MATERIALS AND METHODS

Sixty composite resin specimens were prepared with a universal composite resin (Filtek Z250), and baseline Commission Internationale de l'Eclairage Lab* color coordinates were measured by spectrophotometry. Specimens were subjected to two cycles of staining with coffee and cherry juice for 2 weeks, followed by immersion into mouth rinses (Listerine Whitening Vibrant, Scope White, Crest 3D White, Signal White Now, Oral-B 3D White, and Colgate Optic White). Changes in color coordinates were measured after staining and after 24- and 72-hour immersion periods. Color alterations were calculated both by CIEDE2000 and CIELAB formulas. Data were submitted to analysis of variance for repeated measures and Tukey's multiple comparison test. (α = 0.05).

RESULTS

Immersion in colorant beverages caused perceptible discolorations on composite resin samples (ΔE00  > 2.25 and ΔEab * > 3.46). Immersion period and mouth rinses were significant factors for the color recovery procedure (p < 0.001). The interaction between immersion time and WMR was also significant (p < 0.001).

CONCLUSIONS

The color recovery of composite resin was affected by the brand of mouth rinse and the period of immersion.

CLINICAL SIGNIFICANCE

This in vitro study revealed that tested mouth rinses are capable of recovering discolored composite resin colors after a prolonged exposure period.