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Sol-gel method to fabricate CaP scaffolds by robocasting for tissue engineering
Manuel Houmard1, Qiang Fu, Eduardo Saiz
1Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA. manuel.houmard@wanadoo.fr
Journal of Materials Science. Materials in Medicine
|February 8, 2012
Summary
Researchers developed highly porous calcium phosphate scaffolds for bone repair using robocasting and sol-gel synthesis. These scaffolds mimic cancellous bone properties, enabling bone ingrowth and offering tunable characteristics for enhanced performance.
Area of Science:
- Biomaterials Engineering
- Tissue Engineering
- Materials Science
Background:
- Bone tissue engineering requires scaffolds with specific mechanical properties and porosity to promote bone regeneration.
- Calcium phosphate (CaP) ceramics, particularly hydroxyapatite and β-tricalcium phosphate, are widely investigated for bone repair due to their biocompatibility and osteoconductivity.
Purpose of the Study:
- To fabricate highly porous calcium phosphate scaffolds using a binder-free robocasting technique combined with sol-gel synthesis.
- To characterize the composition, microstructure, and mechanical properties of the fabricated scaffolds.
- To evaluate the potential of these scaffolds for bone tissue engineering applications.
Main Methods:
- Sol-gel synthesis utilizing Calcium Nitrate Tetrahydrate and Triethyl Phosphite precursors in an aqueous medium.
- Binder-free robocasting of the synthesized gel to form porous scaffolds.
- X-ray diffraction (XRD) analysis to determine the phase composition (hydroxyapatite and β-tricalcium phosphate).
- Characterization of porosity, pore size, and compressive strength.
Main Results:
- Fabrication of biphasic hydroxyapatite/β-tricalcium phosphate composite scaffolds with high porosity (~73 vol%) and interconnected macropores (~260 µm).
- Achieved compressive strength of ~6 MPa, comparable to human cancellous bone (2-12 MPa).
- Demonstrated tunability of scaffold composition by adjusting the initial Ca/P ratio.
- Showcased potential for property enhancement via dip-coating with the sol-gel process.
Conclusions:
- The combined robocasting and sol-gel method effectively produces highly porous CaP scaffolds suitable for bone tissue engineering.
- The scaffolds possess mechanical properties and porosity conducive to bone ingrowth and repair.
- The process allows for modification of scaffold chemistry and surface topography to optimize performance for bone regeneration applications.
