Abstract

FARINON, Camila Bruscato; PASQUALOTTO, Giovanna Signori; CARRARO, Kauani  and  RODRIGUES-JUNIO, Sinval Adalberto. Tooth whitening recovers the color of pre-stained composites. Braz. J. Oral Sci. [online]. 2016, vol.15, n.2, pp. 163-166. ISSN 1677-3225.

Aim: To assess the effect of home-whitening on aged and stained composite. 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. 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. They were next subjected to whitening with 10% carbamide peroxide (Whiteness Perfect) for 4 h daily for 1, 2 and 4 weeks. Shade was measured with a spectrophotometer Easyshade and expressed based on the CIE L*a*b* system (ΔE*). Surface roughness was measured with a roughness meter (Ra-μm). Data were analyzed with two-way ANOVA and Tukey's test (α=0.05). Results: Conditioning, grouping and the interaction between both, influenced the ΔE* (p<0.0001), which exceeded the 3.3 threshold for visible color change after conditioning of Group C in black coffee. Whitening for 1 week significantly reduced ΔE* in this group. There were no significant changes in surface roughness. Conclusion: Home-whitening did not alter significantly the color of the nanocomposite, except when it was previously stained. One-week whitening was sufficient to recover color change to an acceptable level.

Keywords : Dentin-Bonding Agents.; Dentin.; Denture Retention..