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Powder 3D Printing of Bone Scaffolds with Uniform and Gradient Pore Sizes Using Cuttlebone-Derived Calcium Phosphate
Francesca Cestari1, Yuejiao Yang1,2, Janka Wilbig3
1Department of Industrial Engineering, University of Trento, Via Sommarive 9, 38123 Trento, Italy.
This study explored the use of 3D printing to create bone scaffolds with controlled pore structures using a natural calcium phosphate powder derived from cuttlebones. The researchers combined this nanopowder with a glass-ceramic powder to overcome printing challenges. The resulting scaffolds had high porosity and supported cell growth, with some showing signs of cell differentiation. The findings suggest that combining natural and synthetic materials can enhance the bioactivity of 3D-printed bone scaffolds.
Area of Science:
- Biomedical engineering
- Tissue engineering
- 3D printing in biomedical applications
Background:
Bone scaffolds are designed to support cell growth and tissue regeneration. Their pore structure significantly influences cellular behavior. Traditional methods lack the precision to control pore geometry, limiting their effectiveness. 3D printing offers a solution by enabling precise design of scaffold porosity. Calcium phosphate materials, especially those derived from natural sources like cuttlebones, have shown promise due to their similarity to natural bone and enhanced bioactivity. However, these materials are difficult to process using 3D printing techniques because of their nanoscale particle size. This challenge has limited their widespread use in tissue engineering applications.
Purpose Of The Study:
This study aimed to explore the feasibility of using cuttlebone-derived calcium phosphate in 3D printing of bone scaffolds. The goal was to fabricate scaffolds with either uniform or gradient pore geometries using a biphasic calcium phosphate nanopowder. The researchers also sought to assess how these scaffold designs affect cell behavior in vitro. By combining the nanopowder with a glass-ceramic powder, they aimed to overcome the processing challenges associated with nanoscale materials. The study focused on evaluating the structural and bioactive properties of the printed scaffolds and their impact on human mesenchymal stem cell activity.
Main Methods:
The researchers used binder jetting 3D printing to fabricate bone scaffolds with controlled pore geometries. A biphasic calcium phosphate (BCP) nanopowder derived from cuttlebones was mixed with a glass-ceramic powder in a 1:10 weight ratio. The scaffolds were sintered at 1150 °C, resulting in a composition dominated by hydroxyapatite (HA) and wollastonite. Pure glass-ceramic scaffolds were also printed for comparison. The porosity of the scaffolds was measured, and their microstructure was analyzed. Human mesenchymal stem cells were seeded onto the scaffolds to evaluate cell adhesion, proliferation, and metabolic activity over a 10-day period.
Main Results:
The sintered scaffolds were primarily composed of hydroxyapatite and wollastonite, with higher HA content observed in scaffolds containing the cuttlebone-derived nanopowder. The addition of the bio-derived powder increased the porosity from 60% to 70%, indicating that the nanoparticles slowed down the densification of the glass-ceramic matrix. Human mesenchymal stem cells adhered and proliferated on all scaffolds, with similar cell numbers across different pore geometries. However, scaffolds with gradient pores and cuttlebone-derived powder showed a decline in metabolic activity over time, suggesting possible cell differentiation. The cells effectively colonized the 3D porous structure, demonstrating good bioactivity of the scaffolds.
Conclusions:
The study demonstrated that cuttlebone-derived calcium phosphate can be successfully used in 3D printing of bone scaffolds with controlled pore geometries. The addition of the bio-derived nanopowder improved porosity and bioactivity, as evidenced by cell adhesion and proliferation. While scaffolds with gradient pores supported similar cell growth, they exhibited a decline in metabolic activity over time, which may indicate cell differentiation. The results suggest that the combination of natural calcium phosphate and glass-ceramic powders is a viable approach for fabricating bioactive bone scaffolds with tailored pore structures.
Frequently Asked Questions
The study found that scaffolds made with cuttlebone-derived calcium phosphate and glass-ceramic powders supported cell growth and bioactivity, with gradient pore scaffolds showing signs of cell differentiation.
The calcium phosphate was derived from cuttlebones, a natural source known for its similarity to human bone composition.
The glass-ceramic powder provided structural stability, while the nanopowder enhanced porosity and bioactivity during sintering.
Cell proliferation was similar across pore geometries, but gradient pores showed reduced metabolic activity over time, suggesting differentiation.
Cell number and metabolic activity were assessed after 3, 5, and 10 days of culturing human mesenchymal stem cells on the scaffolds.
The decline may indicate that cells on gradient pore scaffolds began to differentiate, as suggested by the researchers.
