Korioth T W, Hannam A G
Department of Oral Science, Minnesota Dental Research Center for Biomaterials and Biomechanics School of Dentistry, University of Minnesota, Minneapolis.
J Dent Res. 1994 Jan;73(1):56-66. doi: 10.1177/00220345940730010801.
Localized corpus and dental arch distortions measured directly on human and animal mandibles suggest complex deformation patterns at other mandibular sites during functional loading. To describe these, we simulated selected static bites on a three-dimensional finite element computer model of the human jaw. Five clenching tasks were modeled: intercuspal position, left group function, left group function plus balancing contact, incisal clenching, and right molar clenching. Under conditions of static equilibrium and within the limitations of the current modeling approach, the human jaw deforms elastically during symmetrical and asymmetrical clenching tasks. This deformation is complex, and includes the rotational distortion of the corpora around their axes. In addition, the jaw also deforms parasagittally and transversely. The degree of distortion depended on each clenching task, with actual deformations being relatively small and ranging from 0.46 mm to 1.06 mm for the tasks modeled when all sites were taken into account. The predicted overall narrowing of the dental arch is consistent with clinical reports in the literature during similar, although not identical, static jaw function. The predicted regional deformations of the upper condylar surfaces imply differential loading at their upper surfaces. Although still constrained to forceful static biting conditions, the simulated mandibular and dental arch distortions should be taken into consideration in the design and testing of prosthetic devices in the lower jaw.
直接在人类和动物下颌骨上测量的局部牙弓和牙列变形表明，在功能负荷期间，下颌骨其他部位存在复杂的变形模式。为了描述这些情况，我们在人类颌骨的三维有限元计算机模型上模拟了选定的静态咬合。模拟了五种紧咬任务：牙尖交错位、左侧组牙功能、左侧组牙功能加平衡接触、切牙紧咬和右侧磨牙紧咬。在静态平衡条件下，以及在当前建模方法的限制范围内，人类颌骨在对称和不对称紧咬任务期间会发生弹性变形。这种变形很复杂，包括牙弓绕其轴的旋转扭曲。此外，颌骨还会在矢状旁和横向发生变形。变形程度取决于每个紧咬任务，当考虑所有部位时，模拟任务的实际变形相对较小，范围在0.46毫米至1.06毫米之间。预测的牙弓整体变窄与文献中的临床报告一致，这些报告涉及类似但不完全相同的静态颌骨功能。预测的髁突上表面区域变形意味着其上表面存在不同的负荷。尽管仍局限于强力静态咬合条件，但在设计和测试下颌修复装置时，应考虑模拟的下颌骨和牙弓变形。
