Aim: This study aimed to assess the color recovery effect of whitening toothpastes with different active ingredients on stained composite resins. Methods: Forty disc-shaped specimens (8 mm x 2 mm) were prepared from each of three different composite resins (Gradia Direct Anterior, Neo Spectra ST LV, and Estelite Sigma Quick). The specimens were immersed in coffee (Nescafe Classic, Nestlé) for 12 days then randomly distributed into 4 groups (n=10); three whitening toothpastes Colgate Optic White Expert (COW), Signal White Now (SWN), and Curaprox Black is White (CBW) and one conventional toothpaste Sensodyne Pronamel Intensive Enamel Repair Extra Fresh (SPN). The specimens were brushed for 4 and 12 minutes to simulate 1-month and 3-month of toothbrushing, respectively. Color changes (ΔE00) were measured by spectrophotometer after staining and after 1-month and 3-month of simulated toothbrushing. Data were analyzed using analysis of variance for repeated measures and Tukey's post-hoc test (p˂0.05). Results: The color changes observed in all composite resins after 12 days of immersion in coffee surpassed the 50%:50% acceptability threshold (AT) (ΔE00:1.8). Neo Spectra ST LV showed significant coloration compared to Gradia Direct Anterior and Estelite Sigma Quick. Period of toothbrushing simulation was significant factor for the color recovery procedure. All toothpastes reduced the color change on composite resins below to the AT level after 3-month of simulated toothbrushing. COW, SWN, and CBW did not outperform SPN in removing extrinsic stains in vitro. Conclusion: Color changes that occur over time in composite resins can be a clinical problem. All toothpastes were effective in reducing the coffee-induced discoloration. Keywords: Coffee, Color, Composite resins, Toothpastes
Naiboğlu et al. (Fri,) studied this question.
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