Effects of aging and location on mechanical properties of human dentin

VernacularTitle:年龄与位置对牙本质力学性质的影响
Author: Yuan-zhi XU ¹ ; Qi-xiang YANG ¹ ; Rao-rao WANG ¹ ; Dong-sheng ZHANG ²
Author Information

1. Department of Stomatology, the Tenth People’s Hospital of Tongji University
2. Department of Mechanics, Shanghai University
Publication Type:Journal Article
Keywords: Dentin; Elastic modulus; Hardness; Nanoidentation; Aging
From: Journal of Medical Biomechanics 2017;32(6):E519-E523
CountryChina
Language:Chinese
Abstract: Objective To investigate the variations of elastic modulus and hardness of human dentin with aging and location. Methods The non-carious third molars were collected and divided into youth group, middle-aged group and elderly group. Nanoidentation test was conducted on the dentin specimens from multiple regions to test their mechanical properties. Results The elastic modulus and hardness in outer and middle dentin were greater than those in inner dentin; the elastic modulus and hardness increased with the aging in each region of the dentin. Conclusions The dentin shows a gradient mechanical property. The stiffness and hardness in middle and outer dentin are greater than those in inner dentin. The deformation resistance in middle and outer dentin is stronger than that in inner dentin. Meanwhile, elastic modulus and hardness of the dentin increase with the aging.