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Efficacy of 35 per cent hydrogen peroxide on human enamel: in vitro evaluation in different tooth areas / Eficácia do peróxido de hidrogênio a 35 por cento sobre o esmalte dentário humano
Lima, Max José Pimenta; Araújo, Danilo Barral; Campos, Elisângela de Jesus; Araújo, Roberto Paulo Correia de.
  • Lima, Max José Pimenta; Bahiana School of Medicine and Public Health. Dentistry School. BR
  • Araújo, Danilo Barral; Federal University of Bahia. Institute of Health Sciences. BR
  • Campos, Elisângela de Jesus; Federal University of Bahia. Institute of Health Sciences. BR
  • Araújo, Roberto Paulo Correia de; Federal University of Bahia. Institute of Health Sciences. BR
Acta odontol. latinoam ; 22(3): 163-170, 2009. tab
Article in English | LILACS | ID: lil-585590
ABSTRACT
This study aimed to assess the efficacy of a 35% hydrogen peroxide – 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.
RESUMO

Objetivo:

Avaliar, in vitro, a eficácia do gel do peróxido de hidrogênio a 35%, sem ativação, nos três terços dentários. Faces vestibulares de dentes pré-molares humanos foram escurecidos,seguindo-se de duas sessões de clareamento com intervalos de 7 dias. A eficácia do clareamento foi determinada no terço cervical, terço médio e terço incisal pelo espectrofotômetro Easyshade-Vita, com base no sistema CIELab. Os parâmetros L *, a *, b * determinados em cada um terço revelaram alta luminosidade e tendênciaaos tons verde e amarelo; após a pigmentação, a luminosidade foi reduzida e os parâmetros a* e b* revelaram as tonalidades avermelhadae amarelada. 7 dias após o primeiro clareamento houve uma melhora significativa dos parãmetros L * e a*. 7 dias após o segundo clareamento, os três parâmetros retornaram aos valorespróximos àqueles iniciais, sendo que o parâmetro b * foi o principal fator responsável pela eficácia de clareamento. Os valores referentes ao parâmetro DE indicaram haver percepção visual. A remoção da pigmentação foi satisfatória após os dois clareamentos, sendo que a falta de uniformidade entre os terços após aprimeira sessão justificou a realização de dois procedimentos de clareamento. Em relação a cada terço, o parâmetro DE mostrou percepção visual, embora os valores de L*, a* e b* não demonstraram diferenças estatisticamente significativas.
Subject(s)
Full text: Available Index: LILACS (Americas) Main subject: Tooth Bleaching / Tooth Discoloration / In Vitro Techniques / Hydrogen Peroxide Type of study: Prognostic study Language: English Journal: Acta odontol. latinoam Journal subject: Dentistry Year: 2009 Type: Article Affiliation country: Brazil Institution/Affiliation country: Bahiana School of Medicine and Public Health/BR / Federal University of Bahia/BR

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Full text: Available Index: LILACS (Americas) Main subject: Tooth Bleaching / Tooth Discoloration / In Vitro Techniques / Hydrogen Peroxide Type of study: Prognostic study Language: English Journal: Acta odontol. latinoam Journal subject: Dentistry Year: 2009 Type: Article Affiliation country: Brazil Institution/Affiliation country: Bahiana School of Medicine and Public Health/BR / Federal University of Bahia/BR