![]() On that basis, this study was designed to verify whether tooth whitening alters the color of a universal nanocomposite and to test the hypothesis that significant color alteration after whitening only occurs when the composite contains acquired extrinsic pigments.įifteen disc-shaped specimens with 10 mm diameter and 2 mm thick were built up in a single increment with the universal composite Filtek Z350XT (3M/ESPE, St. Prior studies have shown some evidence of dental composites whitening 3,9, but, the extent to which it is whitened and whether this is sufficient to maintain the restoration following tooth whitening still remains uncertain 3. Other studies have confirmed the color changing effect of several extrinsic pigments from dietary sources, including grape juice, red wine and coffee 4,8-10.Ĭonsidering the capillarity of the restorative composite to staining molecules, it seems fair to assume that the hydrogen peroxide (H2O2) resulting from the tooth whiteners would also percolate the material's structure, due to its low molecular weight 1. Results: Conditioning, grouping and the interaction between both, influenced the ΔE* (p 3.3 is easily detected by anyone, characterizing the color change of a restoration as clinically unacceptable 7,8. Data were analyzed with two-way ANOVA and Tukey's test (α=0.05). Surface roughness was measured with a roughness meter (Ra-μm). Shade was measured with a spectrophotometer Easyshade and expressed based on the CIE L*a*b* system (ΔE*). They were next subjected to whitening with 10% carbamide peroxide (Whiteness Perfect) for 4 h daily for 1, 2 and 4 weeks. The specimens were allocated to three groups (n=5): A – the specimens remained dry B – conditioning in distilled water and C – conditioning in distilled water and coffee. Methods: Fifteen disc-shaped specimens (10 mm diameter x 2 mm thick) of Filtek Z350XT, shade A2E were fabricated, polished and embedded in wax, leaving exposed the top surface. I Universidade Comunitária da Região de Chapecó – Unochapecó, School of Dentistry, Health Sciences Area, Chapecó, SC, BrazilĪim: To assess the effect of home-whitening on aged and stained composite. Tooth whitening recovers the color of pre-stained compositesĬamila Bruscato Farinon I Giovanna Signori Pasqualotto I Kauani Carraro I Sinval Adalberto Rodrigues-Junior I
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