MATERIAL PARAMETERS AND STRESS PROFILES WITHIN THE PERIODONTAL-LIGAMENT
MATERIAL PARAMETERS AND STRESS PROFILES WITHIN THE PERIODONTAL-LIGAMENT
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DOI：
10.1016/s0889-5406(05)81576-8
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发表时间：
1991-05-01
影响因子：
3
通讯作者：
MELSEN, B
中科院分区：
文献类型：
--
作者：
ANDERSEN, KL;PEDERSEN, EH;MELSEN, B
水平和档案的牙周膜的初始应力后，应用各种力系统进行了研究。 两个有限元模型，根据人体解剖材料的部分，开发模拟一个完整的和一个部分下颌骨。 有限元模型的有效性得到了提高，通过识别材料参数;通过应变计测量人类尸检材料中的初始牙齿移动来描述组织的力学性能。 多模型技术，其中数据从一个粗略的全球模型转移到一个更详细的，被用来识别骨结构和边界条件。 改变已知影响结果的参数，以建立有限元模型的有效性。 采用迭代计算的方法，得到了稳定的结果。 然而，优化的骨结构和边界条件的功能并没有显着影响的结果。 牙周膜的弹性刚度被确定为0.07 MPa和tau = 0.49（tau是泊松比）。 应力分布得到了各种力系统-如倾斜，平移，和根的运动。 正如我们所料，当施加倾斜力时，从宫颈到心尖的应力分布有明显的变化。 牙齿的身体运动产生了几乎均匀的应力分布;牙根运动产生的应力模式与倾斜过程中观察到的应力模式相反;咀嚼力单独产生的应力几乎与咀嚼力结合正畸力所产生的应力相同。
Levels and profiles of initial stress in the periodontal ligament after application of various force systems were studied. Two finite-element models, based on sections of human autopsy material, were developed to simulate one full and one partial mandible. The validity of the finite-element model was improved by identification of material parameters; the mechanical properties of the tissue were described by means of strain-gauge measurements of initial tooth movements in human autopsy material. The multiple modeling technique, in which data from a coarse global model are transferred to a more detailed one, was used to identify bone structure and boundary conditions. Parameters known to influence the results were varied to establish the validity of the finite-element model. Iterative calculation methods were used to gain stable results. However, optimizing features of the bone structure and boundary conditions did not influence the results significantly. The elastic stiffness of the periodontal ligament was determined to 0.07 MPa and tau = 0.49 (tau being the Poisson's ratio). Stress profiles were obtained for various force systems - as in tipping, translation, and root movement. As we expected, there was a marked variation in the stress distribution from cervix to apex when tipping forces were applied. Bodily movement of the tooth produced an almost uniform stress distribution; root movement produced stress patterns opposite to those observed during tipping; and masticatory forces alone produced stress almost identical to those achieved by masticatory force in combination with orthodontic forces.