Article (Scientific journals)
3D printed triply periodic minimal surfaces calcium phosphate bone substitute: The effect of porosity design on mechanical properties
Bouakaz, Islam; Sadeghian Dehkord, Ehsan; Meille, Sylvain et al.
2023In Ceramics International
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Keywords :
Materials Chemistry; Process Chemistry and Technology; Ceramics and Composites
Abstract :
[en] Triply periodic minimal surfaces (TPMSs) are relevant structures for building synthetic bone grafts due to their tortuosity and interconnected pores. In order to investigate their porosity and mechanical properties, three different hydroxyapatite-based TPMSs were printed by vat polymerization: the Schwartz diamond, Schwartz primitive, and gyroid scaffolds. Each structure was designed with three levels of porosity, two different pore sizes, and two different wall thicknesses so as to gain an understanding of the effect of pore size and wall thickness on the mechanical properties. The results highlighted the importance of cleaning in the manufacturing process and its impact on the final porosity, especially for small pore sizes. This article intends to be among the first to discuss mechanical testing with macro spherical indentation. Bending and macro spherical indentation resistance tests revealed differences in the mechanical properties between the different structures, with a strong sensitivity of bending strength to the presence of cracks after thermal treatment. Notably, increasing the wall thickness was shown to increase the risk of damage to the solid parts of the scaffolds, therefore lowering the bending strength.
Disciplines :
Materials science & engineering
Author, co-author :
Bouakaz, Islam
Sadeghian Dehkord, Ehsan  ;  Université de Liège - ULiège > GIGA
Meille, Sylvain 
Schrijnemakers, Audrey  ;  Université de Liège - ULiège > Département de chimie (sciences) > GREEnMat
Boschini, Frédéric ;  Université de Liège - ULiège > Département de chimie (sciences) > GREEnMat
Preux, Nicolas
Hocquet, Stéphane
Geris, Liesbet  ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Génie biomécanique
Nolens, Gregory 
Grossin, David 
Dupret-Bories, Agnès 
Language :
English
Title :
3D printed triply periodic minimal surfaces calcium phosphate bone substitute: The effect of porosity design on mechanical properties
Publication date :
October 2023
Journal title :
Ceramics International
ISSN :
0272-8842
Publisher :
Elsevier BV
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 14 November 2023

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