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Finite-element design and optimization of a three-dimensional tetrahedral porous titanium scaffold for the reconstruction of mandibular defects

机译:三维四面体多孔钛支架重建下颌缺损的有限元设计与优化

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Reconstruction of segmental defects in the mandible remains a challenge for maxillofacial surgery. The use of porous scaffolds is a potential method for repairing these defects. Now, additive manufacturing techniques provide a solution for the fabrication of porous scaffolds with specific geometrical shapes and complex structures. The goal of this study was to design and optimize a three-dimensional tetrahedral titanium scaffold for the reconstruction of mandibular defects. With a fixed strut diameter of 0.45 mm and a mean cell size of 2.2 mm, a tetrahedral structural porous scaffold was designed for a simulated anatomical defect derived from computed tomography (CT) data of a human mandible. An optimization method based on the concept of uniform stress was performed on the initial scaffold to realize a minimal-weight design. Geometric and mechanical comparisons between the initial and optimized scaffold show that the optimized scaffold exhibits a larger porosity, 81.90%, as well as a more homogeneous stress distribution. These results demonstrate that tetrahedral structural titanium scaffolds are feasible structures for repairing mandibular defects, and that the proposed optimization scheme has the ability to produce superior scaffolds for mandibular reconstruction with better stability, higher porosity, and less weight. (C) 2017 IPEM. Published by Elsevier Ltd. All rights reserved.
机译:下颌骨中的细分缺陷的重建仍然是颌面外科的挑战。使用多孔支架是修复这些缺陷的潜在方法。现在,添加制造技术提供了用特定几何形状和复杂结构制造多孔支架的解决方案。本研究的目标是设计和优化三维四面体钛支架,用于重建下颌缺陷。固定支柱直径为0.45mm,平均电池尺寸为2.2mm,设计了四面体结构多孔支架,用于衍生自人颌骨的计算断层扫描(CT)数据的模拟解剖缺陷。在初始支架上进行基于均匀应力概念的优化方法,实现最小重量的设计。初始和优化的支架之间的几何和机械比较表明优化的支架表现出较大的孔隙率,81.90%,以及更均匀的应力分布。这些结果表明,四面体结构钛支架是修复下颌缺陷的可行结构,并且所提出的优化方案具有生产具有更好稳定性,孔隙率高,更重量的下颌重建的优异支架。 (c)2017年IPEM。 elsevier有限公司出版。保留所有权利。

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