3D printed triply periodic minimal surfaces calcium phosphate bone substitute: The effect of porosity design on mechanical properties
Year: 2023
Type: article
Abstract: 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.
Source: Ceramics International
Institutions: Centre National de la Recherche Scientifique, Université Toulouse III - Paul Sabatier, University of Liège, Institut National Polytechnique de Toulouse, Centre Interuniversitaire de Recherche et d’Ingénierie des Matériaux, Université de Toulouse, KU Leuven, Lyon 1 Université, Matériaux Ingénierie et Science, Institut National des Sciences Appliquées de Lyon, Belgian Ceramic Research Centre, University of Namur, Centre Hospitalier Universitaire de Toulouse, Institut universitaire du cancer de Toulouse Oncopole
Language: English
Subfield: Biomedical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,440
OpenAlex ID: W4388036658