Elastic modulus determination at different levels of periodontal ligament in nanoindentation  

纳米压痕法测量牙周膜不同层面弹性模量（英文）

作　　者：杨宇[1] 汤文成[1] 

机构地区：[1]东南大学机械工程学院,南京211189

出　　处：《Journal of Southeast University(English Edition)》2017年第1期33-38,共6页东南大学学报（英文版）

基　　金：The National Natural Science Foundation of Chin(No.51305208)

摘　　要：In order to investigate the material properties ofperiodontal ligament （ PDL） in different locations, the nanoindentation method is used to survey the elastic modulus of the PDL at different levels. Cadaveric specimens of human mandibular canine were obtained from 4 adult donors, 16 transverse specimens were made from the sections of cervical margin, midroot and apex using the slow cutting machine. The prepared specimens were tested in different sections （along the longitudinal direction） and different areas （in the circumferential direction）. According to the Oliver-Phair theory, the mean values of elastic modulus were calculated foreach area and the differences among them were compared. In the midroot section, the average elastic modulus is ranging from 0. 11 to 0. 23 MPa, the changing range of the cervical margin and apex are from 0. 21 to 0. 53 MPa and 0. 44 to0.62 MPa, respectively. Experimental results indicate that the average elastic modulus in the midroot is lower than that in the cervical margin and apex, and relatively small changes occur among them. However, there is a large change to the elastic modulus value in the cicumferential direction for the PDL.为了研究牙周膜(PDL)不同部位的材料特性,采用纳米压痕方法测量牙周膜不同层面的弹性模量.实验样本取自4个成年捐献者的上颚尖牙,使用慢速切割机分别在颈缘、根中、根尖3个层面共制作16个切片样本.分别测试每个尖牙样本的不同区域(沿圆周方向)和不同层面(沿长轴方向),基于Oliver-Pharr理论计算这些位置的弹性模量并比较它们之间的差异.根中区域平均弹性模量为0.11~0.23 MPa,颈缘与根尖分别为0.21~0.53 MPa,0.44~0.62 MPa.实验结果表明,根中区域的弹性模量平均值小于颈缘与根尖区域,且变化较小,而沿圆周方向的弹性模量有较大的变化.

关 键 词：periodontal ligament （ PDL） elastic modulus NANOINDENTATION material properties CANINE 

分 类 号：R783.1[医药卫生—口腔医学]