Mechanical strength and viscoelastic response of the periodontal ligament in relation to structure.
Mechanical strength and viscoelastic response of the periodontal ligament in relation to structure.
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DOI：
10.4061/2010/502318
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发表时间：
2010-01-01
期刊：
影响因子：
--
通讯作者：
Komatsu, Koichiro
中科院分区：
文献类型：
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作者：
Komatsu, Koichiro
牙周韧带（PDL）的机械强度首先被测量为用人类标本从牙槽中拔出牙齿所需的力。此后，牙齿-PDL-骨制剂被广泛用于测量PDL的力学响应。用特定的酶对这些标本进行体外处理，可以研究结构成分在PDL机械支撑中的作用。通过应力松弛分析，可以检验PDL的粘弹性响应。视频偏光显微镜显示，拉伸纤维束中的胶原分子和原纤维在松弛过程中逐渐沿变形方向排列。PDL的应力松弛过程可以用一个包含三个指数衰减项的函数很好地表示。胶原酶体外消化胶原纤维后的分析表明，胶原纤维组分可能在PDL应力松弛过程的长期松弛组分中起重要作用。最近对PDL粘弹性性能的动态测量表明，PDL在压缩时比在剪切和拉伸时吸收更多的能量。PDL组织的这些粘弹性机制可以降低PDL损伤的风险。
The mechanical strength of the periodontal ligament (PDL) was first measured as force required to extract a tooth from its socket using human specimens. Thereafter, tooth-PDL-bone preparations have extensively been used for measurement of the mechanical response of the PDL. In vitro treatments of such specimens with specific enzymes allowed one to investigate into the roles of the structural components in the mechanical support of the PDL. The viscoelastic responses of the PDL may be examined by analysis of the stress-relaxation. Video polarised microscopy suggested that the collagen molecules and fibrils in the stretched fibre bundles progressively align along the deformation direction during the relaxation. The stress-relaxation process of the PDL can be well expressed by a function with three exponential decay terms. Analysis after in vitro digestion of the collagen fibres by collagenase revealed that the collagen fibre components may play an important role in the long-term relaxation component of the stress-relaxation process of the PDL. The dynamic measurements of the viscoelastic properties of the PDL have recently suggested that the PDL can absorb more energy in compression than in shear and tension. These viscoelastic mechanisms of the PDL tissue could reduce the risk of injury to the PDL.