Effect of photochemical activation of hydrogen peroxide bleaching gel with and without TiO 2 and different wavelengths
Braz. j. oral sci
;
9(3): 393-397, July-Sept. 2010. ilus, tab
Article
in English
| LILACS, BBO
| ID: lil-578062
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 10min, 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 Tukeys 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.
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Titanium
/
Tooth Bleaching
/
In Vitro Techniques
/
Coloring Agents
/
Hydrogen Peroxide
Limits:
Animals
Language:
English
Journal:
Braz. j. oral sci
Journal subject:
Dentistry
Year:
2010
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
São Paulo State University/BR
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