Influence of different modeling strategies for the periodontal ligament on finite element simulation results
Influence of different modeling strategies for the periodontal ligament on finite element simulation results
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DOI：
10.1016/j.ajodo.2009.11.014
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发表时间：
2011-06-01
影响因子：
3
通讯作者：
Sander, Franz Guenter
中科院分区：
文献类型：
--
作者：
Hohmann, Ansgar;Kober, Cornelia;Sander, Franz Guenter
有限元法是研究牙周膜材料性能和结构响应的一种很有前途的工具。为了在PDL的有限元模拟中获得真实和可重复的结果，合适的生物准坐标几何有限元网格是必不可少的。方法：在这项研究中，4名独立的同事基于体内获得的牙齿的相同高分辨率计算机断层扫描图像数据集，共生成了17个体网格（三维），以比较不同模型生成技术对低正畸力载荷预测响应的影响。结果：牙床厚度对牙体初始活动度有显著影响，但对牙床内观察到的应力分布影响不大。当探索PDL在低载荷下的响应时，牙齿和骨骼都可以被认为是有效的刚性。对于受力系统，几何非线性的影响可以忽略不计。结论：最重要的是，本研究突出了有限元模拟结果对PDL精确几何重建的敏感性。[J]中华口腔颌面矫正外科杂志；2011;39:775-83 .]
Introduction: The finite element method is a promising tool to investigate the material properties and the structural response of the periodontal ligament (PDL). To obtain realistic and reproducible results during finite element simulations of the PDL, suitable bio-fidelic finite element meshes of the geometry are essential. Methods: In this study, 4 independent coworkers generated altogether 17 volume meshes (3-dimensional) based on the same high-resolution computed-tomography image data set of a tooth obtained in vivo to compare the influence of the different model generation techniques on the predicted response to loading for low orthodontic forces. Results: It was shown that the thickness of the PDL has a significant effect on initial tooth mobility but only a remarkably moderate effect on the observed stress distribution in the PDL. Both the tooth and the bone can be considered effectively rigid when exploring the response of the PDL under low loads. The effect of geometric nonlinearities could be neglected for the applied force system. Conclusions: Most importantly, this study highlights the sensitivity of the finite element simulation results for accurate geometric reconstruction of the PDL. (Am J Orthod Dentofacial Orthop 2011; 139: 775-83)