Open AccessCharacterization of the Phosphate Units in Rat Dentin by Solid-State NMR Spectroscopy
Author(s) -
YaoHung Tseng,
YiLing Tsai,
Tim W. T. Tsai,
John Chin Hao Chao,
ChunPin Lin,
Shih-Hao Huang,
ChungYuan Mou,
Jerry C. C. Chan
Publication year - 2007
Publication title -
chemistry of materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.741
H-Index - 375
eISSN - 1520-5002
pISSN - 0897-4756
DOI - 10.1021/cm070531n
Subject(s) - crystallite , apatite , amorphous calcium phosphate , dentin , amorphous solid , chemistry , phosphorus , materials science , phosphate , solid state nuclear magnetic resonance , mineralogy , nuclear chemistry , crystallography , nuclear magnetic resonance , organic chemistry , composite material , physics
Dentin samples of the incisor taken from Wistar rats of different ages are studied. A series of physical techniques are used to characterize the samples, with particular emphasis on 31P solid-state nuclear magnetic resonance. The structure of incisor dentin in rats can be described as apatite crystallites embedded in an amorphous matrix. We find that 19% of the apatite crystallites contain hydroxyl groups, which are distributed near the surface of the crystallites. The internal region of the crystallites is deficient in hydroxyl groups. As rats mature with age, there are several changes in the chemical composition of the incisor dentin: (i) the water content and phosporous amount in the amorphous matrix decrease; (ii) the amount of the phosphorus species in the apatite crystallites remains the same; and (iii) the loss of phosphorus species is accompanied by approximately the same loss of the calcium content.
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