Document Detail

Spectroscopic alterations on enamel and dentin after nanosecond Nd:YAG laser irradiation.
MedLine Citation:
PMID:  16822709     Owner:  NLM     Status:  MEDLINE    
Laser irradiation on hard tissue has produced a resistant surface that is likely to prevent caries. In this study, human enamel and dentine were exposed to nanosecond pulsed Nd:YAG laser with energy densities of 20-40 J/cm(2) and pulse width of 6 ns inducing chemical changes in these tissues. Infrared analysis of human dental enamel and dentine was performed using the KBr method (2mg sample/300 mg KBr). A correlation between non-lased and lased spectra was performed that gives an indication of the changes in organic and inorganic compounds after laser-tissue interaction. Spectra of teeth simultaneously show the inorganic and organic parts of the tissue. The principal bands: amide bands A, I, II, and III from the collagen-matrix, phosphate from the mineral content, and carbonate bands were identified. The normalized area of peak versus peak position was determined. Changes of the bands attributed to the collagen matrix were verified after Nd:YAG irradiation. The present results suggest a chemical modification of organic and mineral compounds by laser. The spectral results indicated an alteration in the absorption bands relative to, essentially, organic compounds.
A Antunes; W de Rossi; D M Zezell
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-07-05
Journal Detail:
Title:  Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy     Volume:  64     ISSN:  1386-1425     ISO Abbreviation:  Spectrochim Acta A Mol Biomol Spectrosc     Publication Date:  2006 Aug 
Date Detail:
Created Date:  2006-08-07     Completed Date:  2006-10-25     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9602533     Medline TA:  Spectrochim Acta A Mol Biomol Spectrosc     Country:  England    
Other Details:
Languages:  eng     Pagination:  1142-6     Citation Subset:  IM    
Instituto de Fisica, Departamento de Fisica Aplicada, Rua do Matao, Travessa R, no. 187, Cidade Universitaria, 05508-090 São Paulo, Brazil.
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MeSH Terms
Dental Enamel / chemistry*,  radiation effects*
Dentin / chemistry*,  radiation effects*
Lasers / adverse effects*
Spectrophotometry, Infrared / methods

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