The role of the fluid phase in the viscous response of bovine periodontal ligament
The role of the fluid phase in the viscous response of bovine periodontal ligament
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DOI：
10.1016/j.jbiomech.2009.12.020
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发表时间：
2010-04-19
影响因子：
2.4
通讯作者：
Wiskott, H. W. Anselm
中科院分区：
文献类型：
--
作者：
Bergomi, Marzio;Cugnoni, Joel;Wiskott, H. W. Anselm
牙周韧带（PDL）的力学响应是复杂的。这种组织在拉伸时表现为超弹性固体，而在压缩时表现为粘性行为。这种复杂性反映在组织的形态上，包括纤维、糖胺聚糖、与周围多孔骨的锯齿状界面和广泛的血管网络。在本研究中，我们分析了纤维基质的粘性行为以及纤维基质与其流体相之间的相互作用。由多层牙本质组成的圆柱形标本。从牛第一磨牙中取出PDL和骨，固定在拉压加载机上。组织的粘性特性进行了分析：(1)通过使试样在不同频率下进行正弦位移，(2)通过在“完全饱和”和“部分干燥”条件下循环试样。这两种模式都有助于确定流体相对机械响应的贡献。结果表明：(1)PDL在循环压缩载荷下表现出伪塑性黏性特征；(2)这种黏性特征主要是多孔基质与组织中未结合流体含量相互作用的结果。从PDL中除去液体在很大程度上消除了它在压缩中的阻尼作用。(C) 2010年Elsevier Ltd.出版。
The mechanical response of the periodontal ligament (PDL) is complex. This tissue responds as a hyperelastic solid when pulled in tension while demonstrating a viscous behavior under compression. This intricacy is reflected in the tissue's morphology, which comprises fibers, glycosaminoglycans, a jagged interface with the surrounding porous bone and an extensive vascular network.In the present study we offer an analysis of the viscous behavior and the interplay between the fibrous matrix and its fluid phase.Cylindrical specimens comprising layers of dentine. PDL and bone were extracted from bovine first molars and affixed to a tensile-compressive loading machine. The viscous properties of the tissue were analyzed (1) by subjecting the specimens to sinusoidal displacements at various frequencies and (2) by cycling the specimens in 'fully saturated' and in 'partially dry' conditions. Both modes assisted in determining the contribution of the fluid phase to the mechanical response.It was concluded that: (1) PDL showed pseudo-plastic viscous features for cyclic compressive loading, (2) these viscous features essentially resulted from interactions between the porous matrix and unbound fluid content of the tissue. Removing the liquid from the PDL largely eliminates its damping effect in compression. (C) 2010 Published by Elsevier Ltd.