Soft tissue mechanics of the temporomandibular joint.
Soft tissue mechanics of the temporomandibular joint.
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颞下颌关节的软组织力学。
DOI：
10.1159/000086197
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
Herring,SusanW
中科院分区：
文献类型：
--
作者：
Sindelar,BettyJ;Herring,SusanW
直接测量颞下颌关节（TMJ）组织变形需要动物实验。大多数可用数据与关节周围骨表面的机械应变有关。然而，骨骼很少是第一个出现损伤的关节组织，在胶原组织（例如椎间盘或关节囊）损伤后受到影响。关节囊韧带引导或限制运动，而关节内椎间盘也可以分配关节负荷。然而，这些组织很难动态可视化，并且不适合应变计连接，因此对体内变形知之甚少。使用猪作为人类颞下颌关节功能的最佳非灵长类动物模型，我们植入了差分可变磁阻传感器来测量关节内椎间盘外侧的前后应变。结果与之前发布的 TMJ 胶囊数据进行了比较。对麻醉动物的被动操作表明，打开、突出和对侧运动导致椎间盘伸长。相反，关闭、后缩和同侧运动会导致椎间盘缩短。这些应变与在胶囊中观察到的应变相反，并且是根据解剖学原理预计的。令人惊讶的是，咀嚼过程中的椎间盘应变与操作过程中的不同。在钳口闭合过程中，圆盘被拉长，后退平衡侧 (16% ± 1) 比工作侧 (8% ± 2) 更多。这种异常行为可能反映了压缩载荷，使得椎间盘由于泊松效应而不是髁突运动而伸长。由于胶囊在动力冲程期间也会伸长，尤其是在平衡侧，因此圆盘和胶囊在同一时刻在同一侧承受最大负载。
Direct measurement of temporomandibular joint (TMJ) tissue deformation requires animal experimentation. Most of the available data pertain to the mechanical strain on the bone surfaces around the joint. However, bone is rarely the first joint tissue to show injury, being affected after damage to collagenous tissues such as the disc or capsule. Capsular ligaments guide or limit movement, while the intra-articular disc may also distribute joint loads. However, these tissues are difficult to visualize dynamically and not suitable for strain gage attachment, so in vivo deformations are poorly understood. Using pigs as the best nonprimate model for human TMJ function, we implanted differential variable reluctance transducers to measure antero-posterior strain in the lateral aspect of the intra-articular disc. The results were compared to previously published data on the TMJ capsule. Passive manipulation in anesthetized animals indicated that opening, protrusion, and contralateral movements caused the disc to elongate. On the contrary, closing, retrusion and ipsilateral movements caused disc shortening. These strains are opposite to those observed in the capsule and are expected on anatomical grounds. Surprisingly, disc strain during mastication differed from that during manipulation. The disc elongated during jaw closure, more on the retruding balancing side (16% ± 1) than on the working side (8% ± 2). This anomalous behavior may reflect compressive loading, such that the disc elongates as a result of the Poisson effect rather than condylar movement. Because the capsule also elongates during the power stroke, especially on the balancing side, both disc and capsule are maximally loaded on the same side at the same moment.