Effect of Saturation and Post Processing on 3D Printed Calcium Phosphate Scaffolds

Abstract:

Three dimensional printing was investigated for fabricating hydroxyapatite (HA) and β-tricalcium phosphate (β-TCP) composite scaffolds using calcium phosphate based ceramics and calcium phosphate cement chemistry. Scaffolds were formed by printing an aqueous sodium phosphate solution on the powder bed consisting of a mixture of dicalcium phosphate anhydrous (DCPA) and calcium hydroxide powders. The sodium phosphate solution was functioning as a binder material and also as the initiator of the wet chemical reaction. Compressive mechanical properties of printed samples were examined as a function of saturation level that was inversely proportional to the powder to liquid ratio. To increase mechanical properties and obtain hydroxyapatite and β-TCP composites, the printed samples were sintered. The effect of sintering parameters including dwell time and sintering temperature were also examined. X-ray diffraction (XRD) was used to examine material composition at different stages of the manufacturing process and to confirm the presence of HA and β-TCP in the final stage. The effect of sintering procedure on the surface topology of the samples was examined using scanning electron microscopy (SEM).

• Periodical: Key Engineering Materials (Volumes 396-398)
• Pages: 663-666
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.396-398.663
• Online since: October 2008
• Authors: Tamas D. Szucs, Dermot Brabazon
• Keywords: 3D Printing, Bone Scaffold, Calcium Phosphate Cement (CPC)

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