Chen Long, Song Xi-ping, Zhang Bei, Yang Kai, Bai Yu-xing
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China.
Zhonghua Kou Qiang Yi Xue Za Zhi. 2008 Aug;43(8):500-1.
To investigate the relationship between the nanohardness and microstructure of the dentin and enamel of human teeth.
Nano indentation was used to determine the nanohardness of enamel and dentin; TEM and IR were utilized to observe the microstructure and crystalline characteristic.
The mean nanohardness of the enamel [(4.92 +/- 0.40) GPa] was significantly higher than that of dentin [(1.17 +/- 0.14) GPa]. A large quantity of hydroxyapatite (HA) crystals and uniform lattice stripe were found in enamel but not in dentin.
The difference of nanohardness between enamel and dentin is related to their density, the inorganic morphology and phase structure.
研究人类牙齿牙本质和牙釉质的纳米硬度与微观结构之间的关系。
采用纳米压痕法测定牙釉质和牙本质的纳米硬度；利用透射电子显微镜（TEM）和红外光谱（IR）观察微观结构和晶体特征。
牙釉质的平均纳米硬度[（4.92±0.40）吉帕]显著高于牙本质[（1.17±0.14）吉帕]。在牙釉质中发现大量羟基磷灰石（HA）晶体和均匀的晶格条纹，而在牙本质中未发现。
牙釉质和牙本质之间纳米硬度的差异与其密度、无机形态和相结构有关。
