Dynamic viscoelastic behavior of bovine periodontal ligament in compression
Dynamic viscoelastic behavior of bovine periodontal ligament in compression
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DOI：
10.1111/jre.12751
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发表时间：
2020-04-12
影响因子：
3.5
通讯作者：
Oskui, Iman Z.
中科院分区：
文献类型：
--
作者：
Najafidoust, Mohammad;Hashemi, Ata;Oskui, Iman Z.
背景与目的牙周膜作为牙齿与周围骨的主要连接物，在生理和准生理载荷的吸收和分配中起着重要的作用。尽管PDL在拉伸和压缩时的力学响应不同，但关于它在压缩时的粘弹性行为的信息很少。为了探讨PDL流体相的贡献，本研究的目的是测量其在压缩过程中的非线性时变行为。材料和方法在三种不同的预加载下，在较宽的频率范围内进行体外动态压缩试验。在实验数据的基础上，提出了广义Maxwell模型，建立了粘弹性模型，用于后续的计算分析。结果发现，压缩损失因子在0.03-0.4范围内高于报道的拉伸损失因子0.04-0.08，这表明流体相在压缩动态响应中起着关键作用。此外，模型参数预测，随着预紧力的增加，粘性部分的作用减小，而弹性部分的作用增加。结论PDL在压缩时的粘性效应大于在拉伸时的粘性效应。此外，牛PDL的松弛模数与外加载荷的依赖关系表明了其压缩过程中的非线性粘弹性行为。
Background and Objective As the main connector of teeth to the surrounding bone, the periodontal ligament (PDL) plays an important role in absorption and distribution of physiological and para-physiological loading. Despite the difference in the mechanical response of the PDL in tension and compression, little information is available on its viscoelastic behavior in compression. To explore the contribution of the fluid phase of the PDL, the aim of the present study was to measure its nonlinear time-dependent behavior in compression.Material and Methods The in vitro dynamic compressive tests were carried out over a wide range of frequencies at three different preloads. Also, a generalized Maxwell model was proposed based on the experimental data to develop a viscoelastic model for subsequent computational analysis of the PDL.Results The higher values of loss factor in compression found in the range of 0.03-0.4 than those of 0.04-0.08 reported in tension, implies the focal role of the fluid phase in compressive dynamic response. Furthermore, the model parameters predicted that with an increase in preload, the role of the viscous components decrease, whereas the role of the elastic component increases.Conclusion The viscous effect of the PDL in compression is greater than that in tension. Also, the dependence of the relaxation modulus of the bovine PDL on the applied load indicates its nonlinear viscoelastic behavior in compression.