颞下颌关节植入物的有限元分析

Vivek Kumar Mall, P. Wahi, Niraj Sinha
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摘要

颞下颌关节(TMJ)是一个滑膜关节,允许下颌相对于颅骨的运动。颞下颌关节位于面部两侧,两侧各一个。它有助于进食等活动的进行。颞下颌关节紊乱有时需要植入物来代替这个关节。某些螺钉和植入物的过度应力可能对TMJ植入物产生不利影响,并可能导致断裂和需要更换。因此,为了预测种植体的应力,本研究使用了有限元分析(FEA)。我们通过对牙齿施加力,并允许髁突在窝上旋转和平移来模拟人类的咬伤,同时限制来自柔性肌肉的刚体运动,这些肌肉被建模为轴向连接器元件。这种方法是新颖的,因为它消除了为了模拟TMJ而收集肌肉力量数据的需要。每个单独的下颌牙齿都可以在这个模拟中加载。由于减少了对TMJ植入物的限制,因此可以更好地了解下颌常规运动下产生的真实应力。
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Finite Element Analysis of a Temporomandibular Joint Implant
Temporomandibular joint (TMJ) is a synovial joint that allows for movement of the jaw in relation to the skull. TMJs are located on both sides of the face, one on either side. It aids in performing of activities such as eating. TMJ disorder may sometime require an implant to replace this joint. Excessive stress on certain screws and implants may adversely affect the TMJ implant and may lead to breakage and requirement of replacement. Therefore, to predict stresses in the implant, finite element analysis (FEA) has been used in this study. We have simulated a human bite by applying force to the teeth and allowing the condyle to rotate and translate over the fossa with the restrictions on the rigid body motions coming from flexible muscles which are modelled as axial connector elements. This method is novel because it eliminates the need to collect data on muscle forces in order to simulate the TMJ as was done conventionally. Each individual mandibular tooth can be loaded in this simulation. Because of the reduced amount of restriction placed on the TMJ implant, it is possible to better understand the true stresses that will be generated under the routine movement of the jaw.
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