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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Loss of structural water and carbonate of Nd:YAG laser-irradiated human enamel

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Correa-Afonso, Alessandra Marques [1] ; Bachmann, Luciano [2] ; de Almeida, Cintia Guimaraes [1] ; Palma Dibb, Regina Guenka [3] ; Borsatto, Maria Cristina [1]
Total Authors: 5
[1] Univ Sao Paulo, Dept Clin Infantil, Fac Odontol Ribeirao Preto Odontol Prevent & Soci, BR-14040904 Sao Paulo - Brazil
[2] Univ Sao Paulo, Dept Fis, Fac Filosofia Ciencias & Letras Ribeirao Preto, BR-14040901 Sao Paulo - Brazil
[3] Univ Sao Paulo, Fac Odontol Ribeirao Preto, Dept Odontol Restauradora, BR-14040904 Sao Paulo - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Lasers in Medical Science; v. 30, n. 4, p. 1183-1187, MAY 2015.
Web of Science Citations: 6

The objective of this study was to use Fourier Transform Infrared (FTIR) spectroscopy and Scanning Electron Microscopy (SEM) to assess whether Nd:YAG laser irradiation associated with a dye or not alters the chemical constitution of the enamel. Fourteen enamel sections were randomly divided into two groups: (1) Nd:YAG and (2) dye + Nd:YAG. First, the untreated enamel surfaces were analyzed by FTIR to acquire the control absorption spectrum. Next, Group 2 received a layer of inactivated coal diluted in deionized water before laser treatment. Enamel samples belonging to groups 1 and 2 were then irradiated with a 1,064-nm Nd:YAG laser (80 mJ, 10 Hz) in the contact mode; the carbonate absorption band and the water absorption band were measured in each sample after irradiation. The water band was measured again 24 h, 48 h, and 7 days after irradiation. Group 1 had statistically similar water and carbonate contents before and after irradiation. Group 2 displayed significantly lower (p < 0.05) water content after irradiation, which remained constant along time at 24 and 48 h. After 7 days, the water content increased slightly, being statistically higher than in the other experimental periods, except for the control. The carbonate/phosphate ratio was measured only at the beginning, and after irradiation, it decreased only in Group 2 indicating carbonate loss (p < 0.05). Irradiation with 1,064-nm Nd:YAG laser associated with a dye reduces the carbonate and structural water content in the enamel. (AU)

FAPESP's process: 10/06861-0 - Influence of Nd:YAG and CO2 laser irradiation on chemical and ultra structural composition of dental enamel
Grantee:Alessandra Marques Corrêa Afonso
Support type: Scholarships in Brazil - Post-Doctorate