Tooth whitening recovers the color of pre-stained composites


  • Camila Bruscato Farinon Universidade Comunitária da Região de Chapecó
  • Giovanna Signori Pasqualotto Universidade Comunitária da Região de Chapecó
  • Kauani Carraro Universidade Comunitária da Região de Chapecó
  • Sinval Adalberto Rodrigues Junior Universidade Comunitária da Região de Chapecó



Tooth bleaching. Tooth bleaching agents. Dental restoration. Permanent.


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. Conclusions: 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.


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Author Biographies

Camila Bruscato Farinon, Universidade Comunitária da Região de Chapecó

Graduanda em Odontologia pela Universidade Comunitária da Região de Chapecó.

Giovanna Signori Pasqualotto, Universidade Comunitária da Região de Chapecó

Graduanda em Odontologia pela Universidade Comunitária da Região de Chapecó.

Kauani Carraro, Universidade Comunitária da Região de Chapecó

Graduanda em Odontologia pela Universidade Comunitária da Região de Chapecó.

Sinval Adalberto Rodrigues Junior, Universidade Comunitária da Região de Chapecó

Graduado em Odontologia pela Universidade Federal de Pelotas em 2001, concluiu o mestrado em Dentística em 2003 pela mesma instituição. Fez doutorado em Odontologia (2008), com área de concentração em Dentística, também pela UFPel, com estágio sanduíche na Oregon Health and Science University (OHSU).


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How to Cite

Farinon CB, Pasqualotto GS, Carraro K, Rodrigues Junior SA. Tooth whitening recovers the color of pre-stained composites. Braz. J. Oral Sci. [Internet]. 2017 Apr. 20 [cited 2023 Feb. 6];15(2):163-6. Available from: