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Published on: August 8, 2022
Conventional Manufacturing by Pouring Versus Additive Manufacturing Technology of β-Tricalcium Phosphate Bone
Tanja Zöller1, Hagen Schmal2,3, Matthias Ahlhelm4
1G.E.R.N. Tissue Replacement, Regeneration & Neogenesis, Department of Orthopedics and Trauma Surgery, Medical Center-Albert-Ludwigs-University of Freiburg, Faculty of Medicine, Albert-Ludwigs-University of Freiburg, Hugstetter Straße 55, 79106 Freiburg, Germany.
Additive manufacturing offers promising beta-tricalcium phosphate (β-TCP) bioceramics for bone defects. While 3D printed structures show good biocompatibility, conventionally sintered implants exhibit superior mechanical strength for bone regeneration.
Area of Science:
- Biomaterials Science
- Orthopedic Surgery
- Materials Engineering
Background:
- Critical bone defects necessitate advanced treatments beyond stabilization.
- Autologous bone grafting, the current standard, faces limitations.
- Alloplastic bone grafting with synthetic materials, like beta-tricalcium phosphate (β-TCP), is gaining traction.
Purpose of the Study:
- To compare conventional sintering and additive manufacturing (3D printing) for β-TCP bioceramics.
- To evaluate the mechanical properties and biocompatibility of resulting β-TCP implants.
- To assess the suitability of these techniques for bone defect treatment.
Main Methods:
- Fabrication of 3D printed β-TCP hybrid structures and conventionally cast β-TCP ceramics.
- Characterization of porosity, mechanical strength (compressive strength), and cell proliferation (biocompatibility).
- Comparison of structural and functional properties between the two manufacturing methods.
Main Results:
- The 3D printed hybrid structure exhibited higher porosity (74.4%) compared to microporous (43.5%) and macroporous (61.8%) β-TCP implants.
- Conventionally sintered microporous β-TCP implants demonstrated significantly higher compressive strength (32.9 MPa) than the 3D printed hybrid structure (10.4 MPa).
- All β-TCP implants showed good biocompatibility with increasing cell proliferation and minimal cytotoxicity over time.
Conclusions:
- Additive manufacturing shows potential for creating β-TCP bioceramics with tailored porosity for bone defects.
- Conventional sintering yields β-TCP implants with superior mechanical strength, crucial for load-bearing applications.
- Further optimization is needed for 3D printed β-TCP to match the mechanical robustness of conventionally produced implants for bone regeneration.
