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首页> 外文期刊>Mathematical Problems in Engineering >Influence of the Temporomandibular Joint in the Estimation of Bone Density in the Mandible through a Bone Remodelling Model
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Influence of the Temporomandibular Joint in the Estimation of Bone Density in the Mandible through a Bone Remodelling Model

机译：颞下颌关节在骨重塑模型对下颌骨骨密度估计中的影响

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摘要

The temporomandibular joint (TMJ) plays a key role in the distribution of stresses in the mandible during mastication and consequently in the distribution of bone density, due to the interconnection between both variables through bone remodelling. Two finite elementmodels of the mandible were compared to study the influence of the redistribution of stresses produced by the joint: (1) amodel without TMJ, but with simplified boundary conditions to replace the joint, as done in previousmodels; (2) amore realistic model including the articular disc and some ligaments present in the TMJ. The stresses and strains in both models were compared through the strain energy density, used in many bone remodelling models as a measure of the mechanical stimulus. An anisotropic bone remodelling model was used to simulate the behaviour of mandible bone and to estimate its density distribution. The results showed that the TMJ strongly affects the stress distribution, the mechanical stimulus, and eventually the bone density, and not only locally in the condyle, but also in the whole mandible. It is concluded that it is utterly important to include a detailed model of the TMJ to estimatemore correctly the stresses in the mandible during mastication and, fromthem, the bone density and anisotropy distribution.
机译：颞下颌关节（TMJ）在咀嚼过程中下颌骨的应力分布中起着关键作用，并因此在骨骼密度的分布中起着重要作用，这归因于两个变量之间通过骨骼重塑之间的相互联系。比较了下颌骨的两个有限元模型，以研究关节产生的应力的重新分布的影响：（1）不使用TMJ，但用简化的边界条件代替关节的模型，如先前模型中所做的那样； （2）更现实的模型，包括关节盘和TMJ中存在的一些韧带。通过应变能密度比较了两个模型中的应力和应变，应变能密度用于许多骨骼重塑模型中，作为机械刺激的量度。各向异性骨重塑模型用于模拟下颌骨的行为并估计其密度分布。结果表明，TMJ不仅对locally骨局部而且对整个下颌骨都强烈影响应力分布，机械刺激并最终影响骨密度。结论是，包括TMJ的详细模型以更正确地估计咀嚼过程中下颌骨中的应力以及由此得出的骨密度和各向异性分布非常重要。

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