散斑干涉方法测定牙槽骨弹性模量  

Young's modulus of alveolar bone determined by speckle interferometry

作　　者：马银行[1] 姜逸菲 刘懋 普盼君 严斌[2] 杨福俊[1] Ma Yinhang;Jiang Yifei;Liu Mao;Pu Panjun;Yan Bin;Yang Fujun(Jiangsu Key Laboratory of Mechanics,Southeast University,Nanjing 211189,China;Department of Orthodontics,Stomatological Hospital Affiliated to Nanjing Medical University,Nanjing 210029,China)

机构地区：[1]东南大学江苏省力学重点实验室,南京211189 [2]南京医科大学附属口腔医院正畸科,南京210029

出　　处：《东南大学学报（自然科学版）》2021年第3期398-403,共6页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(11772092,11472081,81571005);江苏省重点研发计划专项基金资助项目(BE2018723).

摘　　要：针对牙槽骨弹性模量在认识其结构生物力学行为及在口腔正畸治疗方案中的重要作用,应用电子散斑干涉方法对牙槽骨材料的弹性模量进行了实验研究.首先为减少误差采用有限元数值模拟得到牙槽骨梁质量球的单自由度振动模型优化尺寸,并依此利用电子散斑干涉技术对12个试样进行了共振模态测量,基于悬臂梁等效弹簧刚度模型及振动频率测量值获得了不同部位的牙槽骨在不同湿度下的弹性模量.实验结果表明:不同牙位、牙根轴向层面的牙槽骨弹性模量值存在明显差异,磨牙间的牙槽骨弹性模量明显小于前磨牙部位,根尖处牙槽骨弹性模量显著大于根中部位.测量结果与已有文献的接触测量方法获得的牙槽骨弹性模量值及分布特性相一致,证明了骨材料弹性模量的非接触散斑干涉测定技术的可行性与有效性.相比之下,该测试方法对试样约束及加载方式要求较低,具有实验操作简单、非破坏性测量、可多次重复实验的优势.It is important to determine Young's modulus of alveolar bone,for the understanding of the biomechanical behaviors of the bone structure and for the development of orthodontic treatment.The elastic modulus of alveolar bone was experimentally studied by the electronic speckle pattern interferometry(ESPI).To reduce the error in the measurement of the structure of mass-bone-beam,which is considered as a mass-spring system,the sizes of cantilevered bone beams in the structure were optimized by the finite element method.The driving frequencies of 12 alveolar-bone-beam-mass specimens under harmonic excitation were determined by the ESPI method.Young's modulus of alveolar bone at different humid status was obtained based on the equivalent spring constant of the cantilevered-bone-beam-mass model.Experimental results show that there are significant differences in Young's modulus of alveolar bone at different positions.Young's modulus of alveolar bone between molars is significantly smaller than that of premolars,and that of apex is significantly larger than that of mid-root.The measurement results are consistent with the alveolar bone elastic modulus value and distribution characteristics obtained by the contact measurement method in the literature,which proves the feasibility and effectiveness of the non-contact speckle interferometry technique for the elastic modulus of bone materials.In contrast,this method has lower requirements for sample constraints and loading methods,and thus it has the advantages of simple operation,non-destructive measurement,and repeated tests.

关 键 词：牙槽骨 弹性模量 电子散斑干涉 口腔正畸 

分 类 号：O348.1[理学—固体力学]