3-D finite element simulation for ultrasonic propagation in tooth.
3-D finite element simulation for ultrasonic propagation in tooth.
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DOI：
10.1016/j.jdent.2008.04.008
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发表时间：
2008-07
影响因子：
4.4
通讯作者：
Xiaoqing Sun;Erich A Witzel;Hongxin Bian;Shaoying Kang
中科院分区：
文献类型：
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作者：
Xiaoqing Sun;Erich A Witzel;Hongxin Bian;Shaoying Kang
牙齿的超声波测试已被建议作为一种替代方法，确定牙科病理。由于牙齿结构中超声信号的复杂几何形状和低传输效率，很难在体外和体内建立超声行为与特定牙齿病理之间的一一对应关系。为方便超声诊断在口腔医学中的应用，采用有限元方法模拟超声在不同牙体状态下的传播过程。牙齿模型的几何形状由使用X射线计算机断层扫描机扫描真实的牙齿样本产生的3-D图像定义。多孔弹性材料用于模拟牙本质的力学行为。超声波传播的数值模拟进行了3-D有限元模型改变，以模仿各种牙齿条件。采用有限元分析软件ABAQUS作为计算器，通过与实际超声检测结果的对比，验证了有限元模拟与超声检测结果的良好再现性。病理学，如龋齿，也被模拟的有限元模型。独特的影响，每个牙齿的条件上的超声波传播通过牙齿的模式（A-扫描）observed. CONCLUSIONSSThrough有限元模拟，一个特定的牙齿病理超声波模式的影响，可以研究没有其他参数的影响。这将导致更好地了解如何超声可以应用于牙齿内的病理诊断。
OBJECTIVESUltrasonic testing of the tooth has been suggested as an alternative method of identifying dental pathology. Due to the complex geometry and low transmission efficiency of ultrasonic signals in tooth structures, it is difficult to establish one-to-one correspondence between ultrasonic behaviour and specific tooth pathologies both in vitro and in vivo. In order to facilitate ultrasonic diagnosis in dental applications, finite element modeling (FEM) was used to simulate ultrasonic wave propagation in teeth with several dental conditions.METHODS3-D finite element tooth models were developed. The geometry of the tooth models was defined by 3-D images generated by scanning real tooth samples using an X-ray computerized tomography machine. Poro-elastic material was used to simulate the mechanical behaviour of the dentine. Numerical simulations of ultrasonic wave propagation were performed on the 3-D FEM models altered to mimic various dental conditions. The software ABAQUS was used as the calculator in the simulation.RESULTSExcellent replication of ultrasonic behaviours by the FEM simulation was demonstrated through comparison of the simulation results with those of the actual ultrasonic testing on tooth specimens. Pathologies, such as caries, were also simulated on the finite element models. The unique influence of each dental condition on the patterns of ultrasonic waves propagating through the tooth (A-scan) was observed.CONCLUSIONSThrough FEM simulation, the influence of a particular dental pathology on ultrasonic wave pattern can be studied without the impact of other parameters. This will lead to a better understanding of how ultrasound could be applied to the diagnosis of pathology within teeth.