Effects of various hydrogen peroxide bleaching concentrations and number of applications on enamel

Autor(es)

Sandrine Bittencourt Berger ^[1] ; Luis Eduardo Silva Soares ^[2] ; Airton Abrahão Martin ^[3] ; Gláucia Maria Bovi Ambrosano ^[4] ; Cínthia Pereira Machado Tabchoury ^[5] ; Marcelo Giannini ^[6]

Afiliação do(s) autor(es)

^[1] Universidade do Norte do Paraná. School of Dentistry. Department of Restorative Dentistry - Brasil

^[2] Universidade do Vale do Paraíba. Research and Development Institute - Brasil

^[3] Universidade do Vale do Paraíba. Research and Development Institute - Brasil

^[4] Universidade Estadual de Campinas. Piracicaba Dental School. Department of Community Dentistry and Biostatistics - Brasil

^[5] Universidade Estadual de Campinas. Piracicaba Dental School. Department of Physiological Science - Brasil

^[6] Universidade Estadual de Campinas. Piracicaba Dental School. Department of Restorative Dentistry - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Braz. J. Oral Sci.; v. 13, n. 1, p. 22-27, 2014-03-00.

Resumo

AIM: To evaluate the effects of three hydrogen peroxide (HP) concentrations on enamel mineral content (MC), following three peroxide applications and using three methods to measure the MC. METHODS : Forty samples were obtained from bovine incisors and randomly divided into 4 groups (n=10). The control group remained untreated, while the experimental groups were tested for three HP concentrations (10%, 35% and 50%). The HP gel was applied 3 times on the enamel surface for 30 min per application and the samples were analyzed after each application. The MC of the enamel was determined before and after bleaching using Fourier transform (FT-Raman) spectroscopy and micro energy-dispersive x-ray fluorescence spectrometry (µEDXRF). The calcium (Ca) lost from the bleached enamel was quantified with an atomic absorption spectrometer (AAS). The data were analyzed statistically by ANOVA, Tukey and Dunnett´s tests (p<0.05). RESULTS: The FT-Raman showed a decrease in MC for all bleaching treatments, without influence of the different HP concentrations or the number of applications. µEDXRF did not detect any changes in MC. CONCLUSIONS: Ca loss was observed by the AAS, with no difference among the three HP concentrations. The FT-Raman and AAS analyses detected MC reduction and Ca loss after HP bleaching. (AU)

• Processo FAPESP: 05/60696-2 - Efeitos de agentes clareadores de alta concentração para tratamento em consultório na microdureza, morfologia e composição química do esmalte humano
• Beneficiário: Marcelo Giannini
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 05/50811-9 - Estudo do colágeno da dentina por técnicas de microanálise
• Beneficiário: Airton Abrahao Martin
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 01/14384-8 - Estudo de células neoplásicas por espectroscopia de infravermelho próximo
• Beneficiário: Airton Abrahao Martin
• Modalidade de apoio: Auxílio à Pesquisa - Regular