Efficacy of 35 per cent hydrogen peroxide on human enamel: in vitro evaluation in different tooth areas / Eficácia do peróxido de hidrogÛnio a 35 por cento sobre o esmalte dentário humano
Acta odontol. latinoam
; 22(3): 163-170, 2009. tab
Article
in English
| BINACIS
| ID: bin-124089
Responsible library:
AR29.1
Localization: AR29.1
ABSTRACT
This study aimed to assess the efficacy of a 35% hydrogen peroxide ¹ based gel without activation in vitro on three areas of the tooth surface. Vestibular faces of human premolar teeth were darkened, followed by two whitenings at 7-day intervals. The efficacy of whitening was determined in the cervical third, medium third and incisal third of the tooth surface with an Easyshade-Vita spectrophotometer based on the CIELab system. The L*, a*, b* parameters were determined for each third by the identification of high luminosity and hues tending to green and yellow; pigmentation luminosity was then reduced, and the parameters a* and b* became reddish and yellowish, respectively. Seven days after the first whitening, there were significant improvements in L* and a* values. Seven days after the second whitening, the three parameters returned to valuesclose to the initial values; the b* parameter was most strongly correlated with whitening efficacy. DE values revealed a visually perceptible difference.There was a satisfactory removal of pigmentation after both whitenings, while the lack of uniformity among the tooth-surface thirds after the first session justified the performance oftwo whitening procedures. With regard to each third, DE indicated a visibly perceptible difference, although L*, a* and b* values showed no statistically significant differences.(AU)
Full text:
Available
Collection:
National databases
/
Argentina
Database:
BINACIS
Main subject:
Tooth Bleaching
/
Tooth Discoloration
/
Hydrogen Peroxide
Type of study:
Prognostic study
Language:
English
Journal:
Acta odontol. latinoam
Year:
2009
Document type:
Article
Institution/Affiliation country:
Bahiana School of Medicine and Public Health/Brazil
/
Federal University of Bahia/Brazil