Crystal structure studies of human dental apatite as a function of age.
Studies of the average crystal structure properties of human dental apatite as a function of age in the range of 5-87 years are reported. The crystallinity of the dental hydroxyapatite decreases with the age. The a-lattice constant that is associated with the carbonate content in carbonate apatite decreases with age in a systematic way, whereas the c-lattice constant does not change significantly. Thermogravimetric measurements demonstrate an increase of the carbonate content with the age. FTIR spectroscopy reveals both B and A-type carbonate substitutions with the B-type greater than the A-type substitution by a factor up to ~5. An increase of the carbonate content as a function of age can be deduced from the ratio of the nu(2)CO(3) to the nu(1)PO(4) IR modes.
Leventouri
Th
T
Department of Physics and Center for Biological and Materials Physics, Florida Atlantic University, Boca Raton, FL 33431, USA.
Antonakos
A
A
Kyriacou
A
A
Venturelli
R
R
Liarokapis
E
E
Perdikatsis
V
V