Tensile and compressive behaviour of the bovine periodontal ligament
Tensile and compressive behaviour of the bovine periodontal ligament
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DOI：
10.1016/s0021-9290(03)00234-3
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发表时间：
2004-01-01
影响因子：
2.4
通讯作者：
Contro, R
中科院分区：
文献类型：
--
作者：
Pini, M;Zysset, P;Contro, R
本文报道了牛牙周膜（PDL）在单轴拉伸和压缩下的力学响应。从不同深度提取了几个垂直于牛切牙和磨牙纵轴的切片。从这些切片中获得尺寸为10 x 5 x 2圈的标本，包括牙本质、PDL和牙槽骨。扫描电子显微镜显示牛PDL和文献中描述的人PDL微观结构之间具有很强的相似性。在定制的单轴试验机中测试制备的试样。他们被夹在骨头和牙本质末端，浸入37摄氏度的盐水溶液中。应力-应变曲线表明，牙周膜具有非线性和时间依赖性的力学行为，具有胶原性软组织的典型特征。曲线表现出滞后和预处理效果。在拉伸中评价的力学参数是最大切线模量、强度、最大应变和应变能密度。对于磨牙，所有这些参数都随着深度的增加，除了根尖区域。对于切牙，除了极限应变随深度的增加而降低外，所有参数均随深度的增加而增加。据推测，胶原纤维密度和方向是这些发现的原因。(C)2003 Elsevier Ltd.保留所有权利。
The mechanical response of the bovine periodontal ligament (PDL) subjected to uniaxial tension and compression is reported. Several sections normal to the longitudinal axis of bovine incisors and molars were extracted from different depths. Specimens with dimensions 10 x 5 x 2 turn including dentine, PDL and alveolar bone were obtained from these sections. Scanning electron microscopy suggested a strong similarity between the bovine PDL and the human PDL microstructure described in the literature. The prepared specimens were tested in a custom made uniaxial testing machine. They were clamped on their bone and dentine extremities and immersed in a saline solution at 37degreesC. Stress-strain curves indicated that the PDL is characterized by a non-linear and time-dependent mechanical behaviour with the typical features of collagenous soft tissues. The curves exhibited hysteresis and preconditioning effects. The mechanical parameters evaluated in tension were maximum tangent modulus, strength, maximizer strain and strain energy density. For the molars, all these parameters increased with depth except for the apical region. For the incisors, all parameters increased with depth except ultimate strain which decreased. It was assumed that collagen fibre density and orientation were responsible for these findings. (C) 2003 Elsevier Ltd. All rights reserved.