ORIGINAL ARTICLE

 

Effect of photochemical activation of hydrogen peroxide bleaching gel with and without TiO₂ and different wavelengths

 

 

Taciana Marco Ferraz Caneppele^I; Carlos Rocha Gomes Torres^II; Adriana Chung^III; Edson Hidenobu Goto^IV; Soraya Consolin Lekevicius^IV

^IPhD student in Restorative Dentistry, Department of Restorative Dentistry, São José dos Campos Dental School, São Paulo State University – UNESP, Brazil
^IIPhD, Department of Restorative Dentistry, São José dos Campos Dental School, São Paulo State University – UNESP, Brazil
^IIIMsC student in Restorative Dentistry, Department of Restorative Dentistry, São José dos Campos Dental School, São Paulo State University – UNESP, Brazil
^IVDDS, Department of Restorative Dentistry, São José dos Campos Dental School, São Paulo State University – UNESP, Brazil

Correspondence to

 

 

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ABSTRACT

AIM: To evaluate the effect of photochemical activation of hydrogen peroxide (H₂O₂) bleaching gel with different wavelengths.
METHODS: In the study, 80 bovine incisors were used, which were stained in 25% soluble coffee and divided in 4 groups. The initial color was measured with the Easy Shade spectrophotometer by CIE Lab. An experimental 35% H₂O₂ bleaching gel was used, either with or without the presence of titanium dioxide (TiO₂) pigment, associated with two light sources: G1 - Transparent Gel (TG) and no activation; G2 - Gel with TiO₂ and activation with blue LED (l=470nm)\laser (Easy Bleach) appliance; G3 - Gel with TiO₂ and activation with ultraviolet (l=345nm - UV); G4 - TG and activation with UV. Three applications of the gels were made for 10 min, and in each, 3 activations of 3 min, with interval of 30 s between them. The coloration was evaluated again and the variation in color perception (DE) was calculated. The data were submitted to one-way ANOVA and Tukey's test at 5% significance level.
RESULTS: There were significant differences between G1 and G4. The greatest "E value was observed in G4 (13.37). There was no statistically significant difference (p>0.05) between the groups 2, 3 and 4.
CONCLUSIONS: The presence of TiO₂ particules in the bleaching gel did not interfere at the bleaching results.

Keywords: tooth bleaching, hydrogen peroxide, color.

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Correspondence to:
Adriana Chung
Muniz de Souza, 1020 apt 181 CEP 01534-001 São Paulo SP, Brazil
Phone: 11-8778-2457/ 12-3308-4724
E-mail: adri_chung@yahoo.com.br

Received for publication: September 28, 2009
Accepted: August 24, 2010