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Mathematical approach to design 3D scaffolds for the 3D printable bone implant

Abstract

This work demonstrates that an artificial scaffold structure can be designed to exhibit mechanical properties close to the ones of real bone tissue, thus highly reducing the stress-shielding phenomenon. In this study the scan of lumbar vertebra fragment was reproduced to create a numerical 3D model (this model was called the reference bone sample). New nine 3D scaffold samples were designed and their numerical models were created. Using the finite element analysis, a static compression test was performed to assess the effective Young modulus of each tested sample. Also, two important metrics of each sample were assessed: relative density and surface area. Each new designed 3D scaffold sample was analyzed by considering two types of material properties: metal alloy properties (Ti-6Al-4V) and ABS polymer properties. Numerical analysis results of this study confirm that 3D scaffold used to design a periodic structure, either based on interconnected beams (A, B, C, D, E and F units) or made by removing regular shapes from base solid cubes (G, H, I units), can be refined to obtain mechanical properties similar to the ones of trabecular bone tissue. Experimental validation was performed on seven scaffolds (A, B, C, D, E, F and H units) printed from ABS material without any support materials by using Fused Deposition Modeling (FMD) technology. Results of experimental Young modulus of each printed scaffold are also presented and discussed.

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Category:
Articles
Type:
artykuły w czasopismach
Published in:
Biocybernetics and Biomedical Engineering no. 41, pages 667 - 678,
ISSN: 0208-5216
Language:
English
Publication year:
2021
Bibliographic description:
Wojnicz W., Augustyniak M., Borzyszkowski P.: Mathematical approach to design 3D scaffolds for the 3D printable bone implant// Biocybernetics and Biomedical Engineering -Vol. 41,iss. 2 (2021), s.667-678
DOI:
Digital Object Identifier (open in new tab) 10.1016/j.bbe.2021.05.001
Verified by:
Gdańsk University of Technology

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