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首页> 外文期刊>Journal of Biomechanics >Stress-relaxation and microscopic dynamics of rabbit periodontal ligament.
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Stress-relaxation and microscopic dynamics of rabbit periodontal ligament.

机译：兔牙周膜的应力松弛和微观动力学

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The aim of the present study was to examine the structural basis for the stress-relaxation behaviour of the periodontal ligament (PDL). Seventeen 4-month-old rabbits were used. A tooth-PDL-bone segment was cut in a rectangular prism from the incisor of a dissected mandible. The specimen was mounted in a testing machine built on a video stereomicroscope. Following preconditioning, each specimen was stretched to a deformation of 35 microm and then the deformation was kept constant for 300 s to obtain a stress-relaxation curve. Thereafter, stress-relaxation tests were repeated sequentially at deformations of 55, 75, and 95 microm. Polarised-light video-stereomicroscopic images of the specimens were simultaneously recorded and analysed with the stress-relaxation curves. The image analysis revealed that during stress-relaxation, the brightness of the birefringent fibres tended to initially increase rapidly and then do so gradually. There were negative correlations between the brightness and relaxation modulus at the four deformations. The decreases of normalised relaxation modulus for 300 s were less at greater deformation levels. The stress-relaxation process was well described by a function with three exponential decay terms and a constant. These findings suggest that during stress-relaxation of the PDL, the alignment of the collagen molecules and fibrils within the stretched fibres may occur, which could be driven by the strain energy imparted to the specimen on initial stretching.
机译：本研究的目的是检查牙周膜（PDL）应力松弛行为的结构基础。使用17只4个月大的兔子。从解剖的下颌骨的门牙切成直角棱柱形的牙齿-PDL-骨段。将样本安装在基于视频立体显微镜的测试机中。预处理后，将每个样品拉伸至35微米的变形，然后将变形保持恒定300 s，以获得应力松弛曲线。此后，依次以55、75和95微米的变形重复进行应力松弛测试。同时记录了标本的偏光视频立体显微镜图像，并用应力松弛曲线进行了分析。图像分析表明，在应力松弛过程中，双折射纤维的亮度倾向于先迅速增加然后逐渐增加。在四个变形处，亮度和松弛模量之间存在负相关。在较大变形水平下，标准化松弛模量在300 s内的下降较小。通过具有三个指数衰减项和一个常数的函数很好地描述了应力松弛过程。这些发现表明，在PDL应力松弛过程中，可能会发生拉伸后的胶原蛋白分子和原纤维的排列，这可能是由初始拉伸时赋予样品的应变能驱动的。

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