Relationship between the microstructure and nanohardness of dentin and enamel of human teeth

VernacularTitle:人牙釉质及牙本质的纳米硬度与显微结构关系的研究
Author: Long CHEN ¹ ; Xi-Ping SONG ; Bei ZHANG ; Kai YANG ; Yu-Xing PAI
Author Information

1. 北京科技大学
Keywords: Dental enamel; Dentin; Nanohardness
From: Chinese Journal of Stomatology 2008;43(8):500-501
CountryChina
Language:Chinese
Abstract: Objective To investigate the relationship between the nanohardness and mierostructure of the dentin and enamel of human teeth. Methods Nano indentation was used to determine the nanohardness of enamel and dentin; TEM and IR were utilized to observe the microstrueture and crystalline characteristic. Results 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 hut not in dentin. Conclusions The difference of nanohardness between enamel and dentin is related to their density, the inorganic morphology and phase structure.