作为年龄函数的人类牙齿磷灰石晶体结构研究。

Leventouri Th, Antonakos A, Kyriacou A, Venturelli R, Liarokapis E, Perdikatsis V

Department of Physics and Center for Biological and Materials Physics, Florida Atlantic University, Boca Raton, FL 33431, USA.

Int J Biomater. 2009;2009:698547. doi: 10.1155/2009/698547. Epub 2009 Jun 16.

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.

报告了对5至87岁人群牙齿磷灰石平均晶体结构特性随年龄变化的研究。牙齿羟基磷灰石的结晶度随年龄降低。与碳酸盐磷灰石中碳酸盐含量相关的a晶格常数随年龄呈系统性降低，而c晶格常数无显著变化。热重测量表明碳酸盐含量随年龄增加。傅里叶变换红外光谱显示存在B型和A型碳酸盐取代，B型取代大于A型取代，比例高达约5倍。从ν(2)CO(3)与ν(1)PO(4)红外模式的比值可推断出碳酸盐含量随年龄增加。