Effects of Combined Use of Light Irradiation and 35% Hydrogen Peroxide for Dental Bleaching on Human Enamel Mineral Content

Autor(es)

Berger, Sandrine Bittencourt ^[1] ; Cavalli, Vanessa ^[2] ; Martin, Airton Abrahao ^[3] ; Silva Soares, Luis Eduardo ^[4] ; Zezzi Arruda, Marco Aurelio ^[5] ; Brancalion, Marcel Luis ^[5] ; Giannini, Marcelo ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Piracicaba Dent Sch, Dept Restorat Dent, Sao Paulo - Brazil

^[2] Univ Taubate, Dept Restorat Dent, Sao Paulo - Brazil

^[3] Univ Vale Paraiba, Inst Res & Dev, Lab Biomed Vibrat Spect, Sao Paulo - Brazil

^[4] Univ Vale Paraiba, Sch Dent, Dept Dent Mat & Operat Dent, Sao Paulo - Brazil

^[5] Univ Estadual Campinas, Inst Chem, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Photomedicine and Laser Surgery; v. 28, n. 4, p. 533-538, AUG 2010.
• Citações Web of Science: 18

Resumo

Objective: The objective of this study was to evaluate the effects of the combined use of light irradiation (LIR, halogen light, or LED/diode laser) and 35% hydrogen peroxide (35% HP) on human enamel mineral content. Background Data: The use of high-intensity light has been indicated for acceleration of the rate of chemical bleaching; however, it is not known whether LIR can promote additional effects on enamel surfaces during the bleaching. Materials and Methods: One hundred enamel samples were obtained from third molars and randomly divided into 10 groups (n = 10). The control group (CG) remained untreated. Three whitening products were used: Whiteness HP Maxx, Pola Office, and Opalescence Xtra. Bleaching consisted of one session, and the products were applied three times to each specimen for 10 min each. The products were subjected, or not, to LIR during treatment with halogen light or LED/diode laser. The mineral concentration of enamel was determined before and after treatments using an FT-Raman spectroscope (FT-RS), and the amount of calcium lost from the bleached enamel surfaces was quantified with an atomic absorption spectrometer (AAS). Results: FT-RS results showed a decreased mineral content after all treatments, with the exception of Pola Office when irradiated with LED/diode laser and the CG. The losses of calcium detected for Pola Office and Opalescence Xtra were similar for the three situations (without or with light irradiations), whereas for Whiteness HP Maxx the lowest calcium loss was detected without LIR. Conclusion: Most of the bleaching treatments investigated, in combination with LIR or not, can reduce the mineral content of enamel surface. LIR increased the calcium loss for Whiteness HP Maxx; no effects were observed for Pola Office and Opalescence Xtra. (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