EPR properties of synthetic apatites, deorganified dentine, and enamel

Calcified Tissue International
G H KennerW I Higuchi

Abstract

Electron paramagnetic resonance spectroscopy (EPR) was used to study synthetic hydroxyapatite and approximately 1, 2, and 6% synthetic carbonated apatites, deorganified dentine, and enamel. The carbonated apatites were synthesized by hydrolysis of dicalcium phosphate. Comparisons were made with spectra from enamel and deorganified dentine. Microwave power saturation and dose responses were determined for the synthetic materials. The Marquardt version of the Levenberg decomposition method was used to extract individual signals from the apatite data. Two samples of dentine were irradiated with 25 and 100 Gy, respectively, from a 60Co source. The first sample was then deorganified at 200 degreesC using the Soxhlet extraction technique. A third sample was irradiated with 100 Gy after deorganification. The resulting EPR spectra were then compared. It was determined that the dosimetric signal of 2% synthetic carbonated apatite was approximately the same as that of enamel. It was also verified that the dosimetric signal saturates at about 2% in synthetic carbonated apatites. The study established that the precenters responsible for the dosimetric signal (g perpendicular = 2.0018, g parallel = 1.9985) are preferentially concentrated in...Continue Reading

Citations

Jan 1, 1997·Stem Cells·T StraumeV F Minenko
Jul 6, 2010·Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine·Paola Fattibene, Freddy Callens
Mar 31, 2015·Radiation and Environmental Biophysics·D V IvanovE A Pryakhin
Mar 31, 2005·Physics in Medicine and Biology·P FattibeneP Dore
May 24, 2006·Radiation Protection Dosimetry·P FattibeneS Onori

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