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Optimization of extrusion based ceramic 3D printing process for complex bony designs

Roopavath, U; Malferrari, S; Haver, AV; Rath, SN; verstreken, F; Kalaskar, DM; (2019) Optimization of extrusion based ceramic 3D printing process for complex bony designs. Materials and Design , 162 pp. 263-270. 10.1016/j.matdes.2018.11.054. Green open access

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Abstract

In this study presents materials and design optimization of clinically approved hydroxyapatite (HA) using extrusion based 3D printing process. The effect of various printing parameters including print speed, extrusion pressure, accuracy and infill density to produce defined porous structures is established using various techniques. Particularly Scanning Electron Microscopy, Micro Computed Tomography have been employed to study internal and external accuracy. Mechanical testing was employed to study the effect of porosity on compressive properties of 3D printed structures. This study shows that, the infill density and shrinkage of 3D printed HA scaffolds post sintering have a linear relationship. Porosity and mechanical strength of 3D printed scaffolds depend on the infill density of the designed CAD file. Tailoring infill density also helps in altering mechanical properties in a predictable manner. Finally, a case study on hydroxyapatite printing of a patient specific bone graft demonstrates the ability of this material and technique to print complex porous structures created on CT-based anatomical bone models and pre-operative 3D planning, providing further promise for custom implant development for complex bony designs.

Type: Article
Title: Optimization of extrusion based ceramic 3D printing process for complex bony designs
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.matdes.2018.11.054
Publisher version: https://doi.org/10.1016/j.matdes.2018.11.054
Language: English
Additional information: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Keywords: 3D printing, custome bone defects
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Surgery and Interventional Sci
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Surgery and Interventional Sci > Department of Ortho and MSK Science
URI: https://discovery.ucl.ac.uk/id/eprint/10062735
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