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Published in:
Multidisciplinary System Optimisation on the Design of Cost Effective Space Launch Vehicle Read chapter Read first chapter

2018 | OriginalPaper | Chapter

Design of Bone Plates for Mandibular Reconstruction Using Topology and Shape Optimization

Authors : Michael Seebach, Felix Theurer, Peter Foehr, Constantin von Deimling, Rainer Burgkart, Michael Friedrich Zaeh

Published in: Advances in Structural and Multidisciplinary Optimization

Publisher: Springer International Publishing

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Abstract

Tumors in the maxillofacial area and cancer therapy in general can lead to necrosis of the lower jaw (mandible). To prevent tumor spread and infection the necrotic bone and surrounding soft tissue needs to be surgically removed. To restore normal function and appearance of the jaw, the resected mandible is reconstructed using autologous (originating within the body) bone graft from the fibula and titanium bone plates for the osteosynthesis (fixation) of the bone fragments.
Currently, standard bone plates are used that have a high volume or, in the case of mini plates, show a high risk of implant failure. The introduction of optimized, patient-specific bone plates helps to decrease intraoperative stress for the patient and facilitates an improved patient recovery by providing sufficient stabilization of the bone fragments as well as high stiffness and durability of the implants while minimizing the volume of the implanted material.
Within this publication, the design process of the topology optimized bone plates is shown. First, a finite element model of the reconstructed mandible was created using standardized, synthetic bone models, boundary conditions based on a custom made, biomechanical testing rig for the mandible and different biomechanical load cases. Then, the volumes of the initial design areas of the bone plates were reduced using topology optimization and the design of the final bone plates was developed including shape optimization.
Finally, a design validation of the optimized bone plate designs was conducted by a non-linear finite element analysis. A reduction of total volume of 44.9% was achieved by a maximum stress in the bone plates for the different load cases of 230.00 MPa to 797.10 MPa concluding high fatigue strength of the implants. The uneven load distribution over the screws of each bone plate could be reduced by up to 73.72% preventing overloading of one screw and thus reducing the risk of screw failure.

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Metadata
Title
Design of Bone Plates for Mandibular Reconstruction Using Topology and Shape Optimization
Authors
Michael Seebach
Felix Theurer
Peter Foehr
Constantin von Deimling
Rainer Burgkart
Michael Friedrich Zaeh
Copyright Year
2018
Book
Advances in Structural and Multidisciplinary Optimization

Print ISBN: 978-3-319-67987-7

Electronic ISBN: 978-3-319-67988-4

Copyright Year: 2018

DOI
https://doi.org/10.1007/978-3-319-67988-4_154

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