| Autor(es): |
Ana, P. A.
[1]
;
Kauffmann, C. M. F.
[2]
;
Bachmann, L.
[3]
;
Soares, L. E. S.
[4]
;
Martin, A. A.
[4]
;
Gomes, A. S. L.
[2]
;
Zezell, D. M.
[5]
Número total de Autores: 7
|
| Afiliação do(s) autor(es): | [1] Univ Fed Abc, Santo Andre - Brazil
[2] Univ Fed Pernambuco, Recife, PE - Brazil
[3] Univ Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preto, Ribeirao Preto - Brazil
[4] Univ Vale Paraiba, Sao Jose Dos Campos - Brazil
[5] Inst Pesquisas Energet & Nucl, Sao Paulo - Brazil
Número total de Afiliações: 5
|
This study evaluated the effect of combining laser irradiation with fluoride on an enamel microstructure and demineralization by FT-Raman spectroscopy (FTRS). Eighty human enamel slabs were divided into eight groups: (G1) untreated; (G2) acidulated phosphate fluoride application (APF-1.23% F- for 4 min); (G3) Nd:YAG irradiation (84 : 9 J cm(-2), 60 mJ/pulse); (G4) Nd:YAG + APF; (G5) APF + Nd:YAG; (G6) Er,Cr:YSGG irradiation (2.8 J cm(-2), 12.5 mJ/pulse); (G7) Er,Cr:YSGG + APF; and (G8) APF + Er,Cr:YSGG. After treatment, the samples were submitted to a ten-day pH-cycling model. Chemical changes were determined on the slabs before and after treatment, and also after pH-cycling, by FTRS in the range 400-4000 cm(-1). The inorganic bands at 440, 590, 870, 960, 1100 cm(-1), and the organic bands at 1270, 1450, 1670, 2945 cm(-1) were considered. Demineralization promoted reduction in organic contents; Nd:YAG laser irradiation promoted loss of carbonate and organic content, while Er,Cr:YSGG did not produce significant changes in the relative band intensities of organic and inorganic contents of the enamel. In lased samples, no effects caused by pH-cycling on enamel were observed. In conclusion, laser treatment and its association with fluoride can somehow interfere with the demineralization dynamics, reducing its effects over the enamel. (AU) |