Prediction of permanent deformation in cast clasps for denture prostheses using a validated nonlinear finite element model
Prediction of permanent deformation in cast clasps for denture prostheses using a validated nonlinear finite element model
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DOI：
10.1016/j.dental.2005.10.012
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发表时间：
2007-03-01
期刊：
影响因子：
5
通讯作者：
Takahashi, Hidekazu
中科院分区：
文献类型：
--
作者：
Mahmoud, Ahmad Abdel Aziz;Wakabayashi, Noriyuki;Takahashi, Hidekazu
目标。永久变形是影响义齿卡环的最常见的机械并发症之一。这可能导致假体的固位力和稳定性的丧失。本研究的目的是应用和验证非线性有限元模型来预测铸造义齿卡环的永久变形。这样的模型可以增强设计优化的过程，有助于将出现此问题的可能性降至最低。将Ti-6Al-7Nb、Co-Cr和IV型金合金制成的铸造卡环在三个不同的方向(外、内、外倾斜30度)加载，记录所产生的永久变形值。基于屈服的最大变形能量准则，对根据每个实验试件的尺寸复制的扣件模型进行了非线性有限元分析模拟。对实验结果和仿真结果进行线性回归分析，验证了数学模型的有效性。产生特定的永久变形量所需的挠度与实验记录的挠度非常一致，所有弯曲试验的RI值为0.985，以微米表示的线性回归方程为[挠度(FEA)=0.976(挠度(实际))+34]。该模型可以预测铸造卡环在较宽的挠度范围(0~2 mm)内的永久变形行为，这将加强义齿铸造卡环的设计优化过程。(C)2006年牙科材料学会。爱思唯尔有限公司出版。保留所有权利。
Objectives. Permanent deformation is one of the most common mechanical complications that affect denture clasps. This can lead to loss of retention and stability of the prosthesis. The purpose of this study was to apply and validate a nonlinear finite element model for permanent deformation prediction in cast denture clasps. Such a model can enhance the process of design optimization and contribute to minimizing the possibility of this problem.Methods. Cast clasps made from Ti-6Al-7Nb, Co-Cr and Type IV gold alloys were loaded in three different directions (outside, inside and outside inclined 30 degrees), and the resulting permanent deformation values were recorded. Nonlinear finite element analysis simulations based on the maximum distortion energy criterion for yielding, were conducted for clasp models that were reproduced according to the dimensions of each experimental specimen. Linear regression analysis for the results of the experiment and simulation was performed to verify the validity of the mathematical models.Results. Deflections required to produce specific amounts of permanent deformation were in close agreement with those recorded experimentally The RI value for all bending tests was 0.985 and the linear regression equation expressed in micrometers was [Deflection(FEA) = 0.976 (Deflection(Real)) + 34].Significance. Permanent deformation behavior in the cast clasps with a relatively wide range of deflections (0-2 mm) can be predicted using the proposed model, which shall enhance the design optimization process of cast clasps for denture prostheses. (c) 2006 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.