title: Crystallite arrangement of hydroxyapatite microcrystals in human tooth cementum as revealed by electron paramagnetic resonance (EPR).
abstract: 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.
authors.affiliation: Center for Dental Research, Jozef Stefan Institute, University of Ljubljana, Slovenia. skaleric@ibmi.mf.uni-lj.si
authors.forename: U
authors.initials: U
authors.lastname: Skaleric
authors.forename: P
authors.initials: P
authors.lastname: Cevc
authors.forename: B
authors.initials: B
authors.lastname: Gaspirc
authors.forename: M
authors.initials: M
authors.lastname: Schara
mesh_terms: D000328:Adult; D000368:Aged; D003460:Crystallization; D003739:Dental Cementum / Q000737:chemistry* / Q000528:radiation effects; D017886:Durapatite / Q000737:chemistry*; D004578:Electron Spin Resonance Spectroscopy; D005720:Gamma Rays; D006801:Humans; D008875:Middle Aged
chemical_list: D017886:Durapatite