FT-IR photoacoustic depth profiling spectroscopy of enamel

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DOIResolve DOI: http://doi.org/10.1007/BF00334328
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TypeArticle
Journal titleCalcified Tissue International
ISSN0171-967X
1432-0827
Volume54
Issue6
Pages481485; # of pages: 5
SubjectFourier transform infrared spectroscopy; Photoacoustic spectroscopy; Depth; Profile; Enamel; Carbonate; Phosphate
AbstractPhotoacoustic Fourier transform infrared (PA-FT-IR) depth profiling spectra of the enamel of an intact human tooth are obtained in a completely nondestructive fashion. The compositional and structural changes in the tissue are probed from the enamel surface to a depth of about 200 μm. These changes reflect the state of tissue development. The subsurface carbonate gradient in the enamel could be observed over the range of about 10–100 μm. The carbonate-to-phosphate ratio increases in the depth profile. The depth profile also reveals changes in the substitutional distribution of carbonate ions. Type A carbonates (hydroxyl substituted) increase relative to type B carbonates (phosphate substituted) with increasing thermal diffusion length. In addition to the changes in the carbonate ion distribution and content, the PA-FT-IR depth profile clearly indicates a dramatic increase in the protein content relative to the phosphate content with increased depth. The changes in the carbonate content and distribution, along with the changes in the protein content, may be responsible for the changes observed in the apatitic structure in the depth profile of the enamel.
Publication date
PublisherSpringer US
LanguageEnglish
AffiliationNRC Institute for Biodiagnostics; National Research Council Canada
Peer reviewedYes
NRC number109
NPARC number9147670
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Record identifier4ab116e6-b725-46d0-b22a-dd75954a33b2
Record created2009-06-25
Record modified2016-12-06
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