Tooth whitening recovers the color of pre-stained composites
Braz. j. oral sci
;
15(2): 163-166, Apr.-June 2016. ilus
Article
in English
| LILACS, BBO
| ID: biblio-848317
ABSTRACT
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 (Au)
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Tooth Bleaching
/
Analysis of Variance
/
Tooth Bleaching Agents
/
Hydrogen Peroxide
/
Anti-Infective Agents, Local
Language:
English
Journal:
Braz. j. oral sci
Journal subject:
Dentistry
Year:
2016
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Universidade Comunitária da Região de Chapecó/BR
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