AccScience Publishing / IJB / Volume 10 / Issue 1 / DOI: 10.36922/ijb.1768
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RESEARCH ARTICLE

The effect of 3D-printed bone tissue scaffolds geometrical designs on bacterial biofilm formation

Abdulsalam A. Al-Tamimi1* ,  Esraa Aldawood2
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1 Industrial Engineering Department, College of Engineering, King Saud University, Riyadh, Saudi Arabia
2 Department of Clinical Laboratories Sciences, College of Applied Medical Sciences, King Saud University, Riyadh, Saudi Arabia
IJB 2024, 10(1), 1768 https://doi.org/10.36922/ijb.1768
Submitted: 6 September 2023 | Accepted: 26 October 2023 | Published: 5 January 2024
© 2024 by the Author(s). This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution 4.0 International License ( https://creativecommons.org/licenses/by/4.0/ )
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Abstract

Bone fractures are recognized as a global health problem. A common strategy to tackle this issue is to employ a tissue engineering scaffold to accelerate tissue healing. However, one of the main challenges that can result in delaying the recovery is the risk of bacterial infections. This study aims to assess the impact of the geometry and the porosity of tissue scaffolds on the Staphylococcus aureus biofilm formation. Three triply periodic minimal surface designs of Schwarz primitive (SP), gyroid (GY), and Schwarz diamond (SD) and re-entrant auxetic (RE) design were examined and compared to a reference design (RD) considering two different porosity levels of 75% and 45%. The amount of biofilm was quantified using crystal violet assay and was visualized using scanning electron microscopy. The SP scaffold, with low porosity, exhibited a significantly less amount of bacterial biofilm formation and was regarded as having the best design among the others, while the SD with low porosity showed the greatest amount of biofilm. The morphological analysis was also in line with the crystal violet assay results. On the other hand, the surface roughness was affected by the complexity, geometrical variations, and limitations of fused filament fabrication three-dimensional printing. For the RD, SP, GY, and SD designs, an increase in surface roughness was demonstrated to increase the production of bacterial biofilms. Without statistical significance, the RE design showed the opposite trend. Contrary to other designs, the increase in pore size of the SP and GY designs was associated with the development of bacterial biofilms. This study suggests that it is possible to minimize the likelihood of bacterial biofilm formation by optimizing the scaffold geometry and its manufacturing.

Keywords
3D printing
Auxetic
Bacterial biofilm
Bone scaffold
Geometrical design
Triply periodic minimal surface
Funding
The authors extend their appreciation to the Deputyship for Research & Innovation, “Ministry of Education” in Saudi Arabia for funding this research work through the project number (IFKSUDR_P102).
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Conflict of interest
The authors declare no conflicts of interest.
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International Journal of Bioprinting, Electronic ISSN: 2424-8002 Print ISSN: 2424-7723, Published by AccScience Publishing
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