Mechanical behavior of bovine periodontal ligament under tension-compression cyclic displacements
Mechanical behavior of bovine periodontal ligament under tension-compression cyclic displacements
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DOI：
10.1111/j.1600-0722.2006.00269.x
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发表时间：
2006-02-01
影响因子：
1.9
通讯作者：
Komatsu, K
中科院分区：
文献类型：
--
作者：
Shibata, T;Botsis, J;Komatsu, K
在本研究中，牛牙周膜（PDL）受到位移控制的拉-压谐波振荡和随后的断裂的力学响应进行了研究。从牛第一磨牙的不同深度和位置提取标本，包括牙本质、牙骨质、PDL和牙槽骨。他们在室温下浸泡在盐溶液中，并夹在他们的骨头和牙本质末端。在PDL宽度的+/-35%处测试样品，频率为1 Hz。评价的力学参数是滞后，相位滞后，和拉伸和压缩的应力-拉伸比曲线的模量。还记录了拉伸强度和相应的拉伸比。应力-拉伸比曲线表明，非线性，时间依赖性的响应滞后和预处理的影响。压缩时的滞回和相位滞后远大于拉伸时的滞回和相位滞后，表明压缩时的耗散能大于拉伸时的耗散能。除了拉伸强度和相应拉伸比的有限统计学差异外，根部深度和位置对拉伸或压缩数据没有重要作用。因此，由于不同的骨轮廓、PDL宽度和纤维方向，样本的生物学变异性不会影响PDL的能量吸收能力。应力速率随应力的演变表明刚度随应力不断增加。拉伸时的刚度值是压缩时的两倍。数据还表明，PDL的刚度与其他软组织报告的数据相当。
In the present study, the mechanical response of bovine periodontal ligament (PDL) subjected to displacement-controlled tension-compression harmonic oscillations and subsequent rupture was examined. Specimens including dentine, cementum, PDL, and alveolar bone were extracted from different depths and locations of bovine first molars. They were immersed in a saline solution at room temperature and clamped on their bone and dentine extremities. The samples were tested at +/- 35% of the PDL's width, with a frequency of 1 Hz. The mechanical parameters evaluated were hysteresis, phase lag, and the modulus of the stress-stretch ratio curves in tension and compression. The tensile strength and the corresponding stretch ratio were also recorded. Stress-stretch ratio curves indicated a non-linear, time-dependent response with hysteresis and preconditioning effects. The hysteresis and phase lag in compression were much higher than in tension, suggesting that the dissipated energy was higher in compression than in tension. The root depth and location did not play essential roles for the tension or compression data, with the exception of limited statistical differences for tensile strength and corresponding stretch ratio. Thus, biological variability in the specimens, as a result of different bone contours, PDL width, and fiber orientation, did not affect the energy-absorbing capacity of the PDL. The evolution of the stress rate with stress demonstrated a constant increase of stiffness with stress. The stiffness values were twofold higher in tension than in compression. The data also showed that the stiffness of the PDL was comparable with data reported for other soft tissues.