年龄与位置对牙本质力学性质的影响  

Effects of aging and location on mechanical properties of human dentin

作　　者：徐远志[1] 杨启祥[1] 汪饶饶[1] 张东升[2] 

机构地区：[1]同济大学附属第十人民医院口腔科,上海200072 [2]上海大学力学系,上海200444

出　　处：《医用生物力学》2017年第6期519-523,共5页Journal of Medical Biomechanics

基　　金：上海市自然科学基金项目(14ZR1432700)

摘　　要：目的研究人牙本质弹性模量和硬度随年龄和位置的变化情况。方法采集下颌无龋坏第3磨牙,按照年龄分为青年、中年、老年3组。采用纳米压痕对牙本质切片的多个位置进行力学测试。结果外层和中层牙本质的弹性模量和硬度大于内层牙本质的弹性模量和硬度;随着年龄的增长,各个区域的牙本质弹性模量和硬度都增大。结论牙本质具有梯度力学特性,外层和中层牙本质具有很高的刚度,其抵抗变形的能力要强于内层牙本质。同时,随着年龄增长牙本质弹性模量和硬度增大。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.

关 键 词：牙本质 弹性模量 硬度 纳米压痕 年龄 

分 类 号：R318.01[医药卫生—生物医学工程]