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- Talk
- 13/09/2021
- UK
Direct 3D Printing of Polyetheretherketone/hydroxyapatite Composite Materials for Orthopaedic Applications
Description
In this presentation, Adrian Boyd introduces a family of high-temperature polymers known as polyaryletherketones (PAEK) and specifically focuses on polyetherketone (PEK) due to their favorable properties such as biocompatibility, bio-stability, and mechanical strength, making them suitable for various orthopedic applications. Despite their FDA approval and advantageous characteristics, these polymers are bioinert, necessitating enhancements through bioactive agents like hydroxyapatite and bioglass to improve their bioactivity and mechanical properties.
The talk explores the potential of 3D printing these materials for personalized orthopedic devices and surgical instruments, emphasizing the challenges of printing high-temperature polymers that require precise temperature control in the printing environment to prevent issues like warping and poor adhesion of layers. Adrian discusses using common 3D printing methods, such as fused filament fabrication and selective laser sintering, alongside the modifications made to an off-the-shelf printer to meet the requirements for printing PEEK and hydroxyapatite composites.
Results from micro-CT scans of the printed samples show a uniform distribution of hydroxyapatite, with enhancement in mechanical properties as the hydroxyapatite content increases, aligning with the mechanical strength of human cortical bone. The presentation highlights the potential for both mechanical enhancement and bioactivity in these composites, supported by preliminary in vitro work demonstrating good cellular attachment.
Additionally, Adrian addresses inquiries regarding the fatigue properties of the material over time and the potential lack of osteocyte presence within the construct. The presentation concludes with a reminder of the ongoing research aimed at developing these customizable devices for orthopedic applications, emphasizing further collaborations and future studies.