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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

FTIR and SEM analysis of CO2 laser irradiated human enamel

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Autor(es):
Correa-Afonso, Alessandra Marques [1] ; Bachmann, Luciano [2] ; de Almeida, Cintia Guimaraes [1] ; Milori Corona, Silmara Aparecida [3] ; Borsatto, Maria Cristina [1]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Fac Odontol Ribeirao Preto, Dept Clin Infantil Odontol Prevent & Social, BR-14040904 Ribeirao Preto, SP - Brazil
[2] Univ Sao Paulo, Dept Fis, Fac Filosofia Ciencias & Letras Ribeirao Pret, BR-14040901 Ribeirao Preto, SP - Brazil
[3] Univ Sao Paulo, Fac Odontol Ribeirao Preto, Dept Odontol Restauradora, BR-14040904 Ribeirao Preto, SP - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: ARCHIVES OF ORAL BIOLOGY; v. 57, n. 9, p. 1153-1158, SEP 2012.
Citações Web of Science: 16
Resumo

Objectives: Considering the enamel chemical structure, especially carbonate band, which has a major role in the caries prevention, the objective of the present study was to assess the chemical alterations on the enamel irradiated with CO2 laser by means of FTIR spectroscopy and SEM analysis. Design: The enamel surfaces were analysed on a spectrometer for acquisition of the absorption spectrum relative to the chemical composition of the control sample. The irradiation was conducted with a 10.6-mu m CO2 laser (0.55 W, 660 W/cm(2)). The carbonate absorption band at 1600-1291 cm(-1) as well as the water absorption band at 3793-2652 cm(-1) was measured in each sample after the irradiation. The water band was measured again 24-h after the irradiation. The band area of each chemical compound was delimited, the background was subtracted, and the area under each band was integrated. Each area was normalized by the phosphate band (1190-702 cm(-1)). Results: There was a statistically significant decrease (p < 0.05) in the water content after irradiation (control: 0.184 +/- 0.04; irradiated: 0.078 +/- 0.026), which increased again after rehydration (0.145 +/- 0.038). The carbonate/phosphate ratio was measured initially (0.112 +/- 0.029) and its reduction after irradiation indicated the carbonate loss (0.088 +/- 0.014) (p < 0.05). Conclusion: The 10.6-mu m CO2 laser irradiation diminishes the carbonate and water contents in the enamel after irradiation. (C) 2012 Elsevier Ltd. All rights reserved. (AU)

Processo FAPESP: 03/13489-6 - Caracterização de tecidos dentais duros após irradiação laser e tratamento químico: avaliação da composição, estrutura e resistência química
Beneficiário:Luciano Bachmann
Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores
Processo FAPESP: 10/06861-0 - Influência da irradiação dos lasers Nd:YAG e CO2 na composição química e ultra-estrutural do esmalte dental
Beneficiário:Alessandra Marques Corrêa Afonso
Linha de fomento: Bolsas no Brasil - Pós-Doutorado