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Eur J Oral Sci. 1998 Jan;106 Suppl 1:365-7.

Crystallite arrangement of hydroxyapatite microcrystals in human tooth cementum as revealed by electron paramagnetic resonance (EPR).

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Center for Dental Research, Jozef Stefan Institute, University of Ljubljana, Slovenia.


Human dental cementum was analyzed by electron paramagnetic resonance (EPR). The measured EPR powder spectra of gamma-irradiated cementum resembled those of gamma-irradiated enamel. Both spectra were characterized by the same line shapes and g values. The position of the extreme first derivate peaks can be described by g1 = 2.0023 and g2 = 1.9971 +/- 0.0002, and are assignable to the CO3(3-) center. The angular dependence of the cementum EPR spectra indicates a different arrangement of the hydroxyapatite microcrystals compared to that of enamel. A corresponding model of cementum microcrystal alignment has been proposed. The methodology presented can be utilized for studying the mineralization process of root cementum and other mineralized tissues.

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