In vitro effects of hydrogen peroxide combined with different activators for the in-office bleaching technique on enamel

Autor(es)

Nunes Leite Lima, Debora Alves ^[1] ; Baggio Aguiar, Flavio Henrique ^[1] ; Pavesi Pini, Nubia Inocencya ^[1] ; Silva Soares, Luis Eduardo ^[2] ; Martin, Airton Abrahao ^[2] ; Suzy Liporoni, Priscila Christiane ^[3] ; Bovi Ambrosano, Glaucia Maria ^[4] ; Lovadino, Jose Roberto ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Dept Restorat Dent, Piracicaba Dent Sch, FOP Unicamp, Piracicaba, SP - Brazil

^[2] Vale Paraiba UNIVAP, Lab Biomed Vibrat Scpectroscopy LEVB, Inst Res & Dev, Sao Jose Dos Campos, SP - Brazil

^[3] Univ Taubate, Sch Dent, Dept Restorat Dent, Taubate, SP - Brazil

^[4] Univ Estadual Campinas, Piracicaba Dent Sch, Dept Social Dent Stat, Airton Abrahao Martin Lab Biomed Vibrat Spect, Piracicaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ACTA ODONTOLOGICA SCANDINAVICA; v. 73, n. 7, p. 516-521, 2015.
• Citações Web of Science: 3

Resumo

Objective. The aim of this study was to evaluate the alteration of human enamel bleached with high concentrations of hydrogen peroxide associated with different activators. Materials and methods. Fifty enamel/ dentin blocks (4 x 4 mm) were obtained from human third molars and randomized divided according to the bleaching procedure (n = 10): G1 = 35% hydrogen peroxide (HP -Whiteness HP Maxx); G2 = HP + Halogen lamp (HL); G3 = HP + 7% sodium bicarbonate (SB); G4 = HP + 20% sodium hydroxide (SH); and G5 = 38% hydrogen peroxide (OXB - Opalescence Xtra Boost). The bleaching treatments were performed in three sessions with a 7-day interval between them. The enamel content, before (baseline) and after bleaching, was determined using an FT-Raman spectrometer and was based on the concentration of phosphate, carbonate, and organic matrix. Statistical analysis was performed using two-way ANOVA for repeated measures and Tukey's test. Results. The results showed no significant differences between time of analysis (p = 0.5175) for most treatments and peak areas analyzed; and among bleaching treatments (p = 0.4184). The comparisons during and after bleaching revealed a significant difference in the HP group for the peak areas of carbonate and organic matrix, and for the organic matrix in OXB and HP+ SH groups. Tukey's analysis determined that the difference, peak areas, and the interaction among treatment, time and peak was statistically significant (p < 0.05). Conclusion. The association of activators with hydrogen peroxide was effective in the alteration of enamel, mainly with regards to the organic matrix. (AU)

• Processo FAPESP: 05/60082-4 - Eficacia do clareamento de alta concentracao catalisado por diferentes sistemas e o seu efeito no esmalte dental. estudo in vitro.
• Beneficiário: Debora Alves Nunes Leite Lima
• Linha de fomento: Bolsas no Brasil - Doutorado
• Processo FAPESP: 01/14384-8 - Estudo de células neoplásicas por espectroscopia de infravermelho próximo
• Beneficiário: Airton Abrahao Martin
• Linha de fomento: Auxílio à Pesquisa - Regular