Abstract
Strontium (Sr) is a trace metal ion that exists in natural bones. It not only regulates metabolism but also promotes osteoblast differentiation and the formation of new bones. In this study, a new method was developed to prepare Sr-doped hydroxyapatite (HA) three-dimensional (3D) porous scaffolds. A preliminary scaffold was obtained by an extrusion 3D printing method using HA–sodium alginate composite slurry as printing ink. Then, the obtained scaffolds were immersed in a strontium chloride (SrCl2·6H2O) solution of different concentrations (1 wt.%, 5 wt.%, 10 wt.%, and 15 wt.%) for 24 h. Finally, the scaffolds were dried and then sintered at 1200°C to obtain the final scaffolds. The Sr-doped scaffolds were characterized by scanning electron microscopy, x-ray diffraction, Fourier-transform infrared spectroscopy, mechanical testing, and cell culture testing. The results show that the Sr-doped HA scaffold has better compactness and compressive strength than the HA-0Sr scaffold, and promotes cell proliferation and osteoblast differentiation. This indicates that the alternative method is suitable for preparing ion-doping ceramic scaffolds for bone tissue engineering.
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Acknowledgements
The authors gratefully acknowledge the financial supports from the National Natural Science Foundation of China (No. 32001017, 31960207, 52061031). This work was also supported by Nanchang Municipal Key Laboratory of 3D Bioprinting Technology and Equipment (No. 2019NCZDSY001).
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Li, K., Li, S., Ai, F. et al. Fabrication and Characterization of Sr-doped Hydroxyapatite Porous Scaffold. JOM 73, 1745–1753 (2021). https://doi.org/10.1007/s11837-021-04684-0
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DOI: https://doi.org/10.1007/s11837-021-04684-0