Tanaka Eiji, Del Pozo Rodrigo, Sugiyama Masaru, Tanne Kazuo
Department of Orthodontics, Hiroshima University Faculty of Dentistry, Hiroshima, Japan.
J Oral Maxillofac Surg. 2002 May;60(5):546-51. doi: 10.1053/joms.2002.31853.
The present study was conducted to investigate the biomechanical response of bovine retrodiscal tissue of the temporomandibular joint (TMJ) in compression.
Using 10 retrodiscal tissues obtained from 10 cattle, the viscoelastic response of the retrodiscal tissue was evaluated by means of stress-strain analyses. These compressive strains were produced at a high strain rate and were kept constant during 5 minutes for stress-relaxation.
Although the stress-strain relationship in the retrodiscal tissue was essentially nonlinear represented by a quadratic or power function of strain, a linear model could reasonably represent its elastic property. In this case, the instantaneous and relaxed moduli were 1.54 and 0.21 MPa, respectively. The stress-relaxation curve showed a marked drop in load during the initial 10 seconds, and the stress reached a steady nonzero level. Furthermore, when using Kelvin's model, a satisfactory agreement can be obtained between the experimental and theoretical stress-relaxation curves.
It is concluded that bovine retrodiscal tissue has a great capacity for energy dissipation during stress-relaxation, although it has little or no function to pull the articular disc back.
本研究旨在调查颞下颌关节（TMJ）牛椎间盘后组织在压缩时的生物力学反应。
使用从10头牛获得的10个椎间盘后组织，通过应力-应变分析评估椎间盘后组织的粘弹性反应。这些压缩应变以高应变率产生，并在5分钟内保持恒定以进行应力松弛。
尽管椎间盘后组织中的应力-应变关系本质上是非线性的，由应变的二次函数或幂函数表示，但线性模型可以合理地表示其弹性特性。在这种情况下，瞬时模量和松弛模量分别为1.54和0.21MPa。应力松弛曲线在最初的10秒内显示出载荷明显下降，并且应力达到稳定的非零水平。此外，当使用开尔文模型时，实验应力松弛曲线和理论应力松弛曲线之间可以获得令人满意的一致性。
得出的结论是，牛椎间盘后组织在应力松弛过程中具有很大的能量耗散能力，尽管它几乎没有或没有将关节盘拉回的功能。
