DETERMINATION OF VISCOELASTIC PROPERTIES OF THE PERIODONTAL LIGAMENT USING NANOINDENTATION TESTING AND NUMERICAL MODELING
DETERMINATION OF VISCOELASTIC PROPERTIES OF THE PERIODONTAL LIGAMENT USING NANOINDENTATION TESTING AND NUMERICAL MODELING
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DOI：
10.1142/s0219519416500895
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发表时间：
2016-09
影响因子：
0.8
通讯作者：
Huixiang Huang;Wencheng Tang;Yang Yu;Bin Wu;B. Yan
中科院分区：
文献类型：
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作者：
Huixiang Huang;Wencheng Tang;Yang Yu;Bin Wu;B. Yan
牙周膜的粘弹性在牙齿和牙槽骨之间的载荷传递以及牙齿的移动中起着重要的作用。本文提出了一种新颖的纳米压痕实验，并结合流变模型来表征PDL的粘弹性力学性能。在Zener模型的基础上，建立了Berkovich压痕实验和球形压痕实验的蠕变模型。用Berkovich压痕仪测定了材料的硬度和折合弹性系数。采用曲线拟合法对参数进行辨识。拟合结果表明，蠕变模型与实验数据吻合较好。同时，通过将加载段载荷-深度关系的数值曲线与相应的试验数据进行比较，验证了两种模型的有效性。结果表明，球形压头比Berkovich压头更适合测试PDL的粘弹性力学性能。为此，对球形压头的纳米压痕实验进行了模拟，并对齐纳模型进行了有限元分析。模拟结果与实验数据吻合较好，表明齐纳模型能够较好地描述PDL的粘弹性力学行为。
Viscoelasticity of the periodontal ligament (PDL) plays an important role in load transmission between tooth and alveolar bone, as well as tooth movement. This paper provides a novel nanoindentation experiment in combination with a rheological model to characterize the viscoelastic mechanical properties of the PDL. Two creep models of the indentation experiments with a Berkovich and a spherical indenter based on Zener model were developed. The hardness and reduced modulus were determined by using the Berkovich indenter. The parameters were identified through curve fittings. The fitting results show that the creep models are both in good agreement with the experimental data. Meanwhile, the models were both validated by comparing the numerical curves for load–depth relationship in loading segment with the corresponding experimental data. It is found that the spherical indenter is more suitable for testing the viscoelastic mechanical properties of the PDL than Berkovich indenter. Hence, the nanoindentation experiment with spherical indenter was simulated to further evaluate the Zener model by finite element analysis. The good agreement between the simulated results and experimental data demonstrates that the Zener model is capable of describing the viscoelastic mechanical behavior of the PDL.