人体颞下颌关节盘后组织生物力学研究

A Biomechanical Study on the Retrodiscal Tissue of Human Temporomandibular Joint

确定了颞下颌关节盘后组织的生物力学性质，研究其功能机制。对取自8个新鲜关节标本的13个盘后组织试件进行了软组织单向拉伸应力松弛和破坏实验，结合FungYC拟线性粘弹性理论对实验结果进行了分析。结果表明：盘后组织的生理二相区在20％～30％应变范围内。盘后组织拉伸强度和刚度较小但破坏应变较大；外侧组织的屈服能量高于内侧而拉伸强度和刚度无差异。在低应变水平，可以用拟线性粘弹性模型描述盘后组织的流变学特性。结论是盘后组织具有较低的强度安全储备，组织被动变形很有可能是关节盘前移的潜在因素。

In order to investigate the biomechanical properties and functional mechanism of the retrodiscal tissue (RT) of human temporomandibular joint (TMJ), we conducted a uniaxial tensile test on thirteen RT specimens taken from eight fresh TMJs of the human cadavers aged between 8-15 years (m=11. 8yrs). The experimental data were analyzed in conjunction with the Quasi-Linear Viscoelastic Theory as proposed by Fung YC to characterize the time-dependent behaviour and the constitutive relationship of the RT. The results showed that the physiological biphasic zone of stress-strain curve lied within 20%-30% strain levels. The elastic modulus (MPa),tensile strength(MPa) and strain to failure(%) were high. There were significant differences in strain to yielding and energy resorption (N .mm) between lateral and medial RT. There was a good agreement between theoretical prediction value and experimental result within 6% strain level. These data suggest that there would be a higher passive de formation and lower safety storage of strength in the RT which could be related to anterior displacement of the TMJ disc and that Fung's Theory can adequately describe the stress-time behaviour and the constitutive relationship of the RT within lower strain rate.