Forsterite-Based Bioceramics for Bone Tissue Engineering

Forsterite (Mg₂SiO₄)-based bioceramics have emerged as a promising class of synthetic materials for bone tissue engineering. Combining the superior mechanical strength of magnesium silicate with tunable bioactivity, these ceramics support osteoconduction and stimulate mineral deposition. Standard fabrication approaches include sol–gel synthesis, polymer sponge replication, additive manufacturing of MgO/SiO₂ cements and electrophoretic deposition for coatings, often coupled with hydrothermal or thermal treatments to improve crystallinity, porosity and surface chemistry. Controlled porosity, ranging from macroporous networks for vascularisation to nanoporous surfaces for protein adsorption, can be engineered via porogens, printing parameters or hydrothermal growth of hydroxyapatite layers. The intrinsic degradation behaviour of forsterite releases Mg²⁺ and soluble silicate species, which have been shown to enhance cell proliferation and osteogenic differentiation of mesenchymal stem cells. Mechanical properties, including compressive strength and elastic modulus, can be tailored to approach those of cancellous or cortical bone by adjusting porosity and composite formulations. Recent innovations also integrate photothermal functionality through embedded carbon phases, enabling antimicrobial action under near-infrared irradiation. Collectively, these advances position forsterite-based bioceramics as versatile scaffolds for repairing load-bearing bone defects while offering additional therapeutic modalities.

Research from Nature Portfolio

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Research from all publishers

Recent studies have focused on refining scaffold architecture and multifunctionality. In 2022, porous forsterite ceramics were produced via a sol–gel route combined with a sucrose porogen, followed by sintering at 1250–1320 °C. These scaffolds exhibited interconnected porosity, enhanced cell viability in vitro and compressive strengths approaching 30 MPa, indicating suitability for cancellous bone repair. In 2021, three-dimensional printed polymer-derived forsterite scaffolds were functionalised with hydroxyapatite through hydrothermal deposition, achieving a photothermal antibacterial effect against both Staphylococcus aureus and Escherichia coli without compromising mechanical integrity. Hydroxyapatite morphology was tuned by controlling solution pH and temperature, simultaneously promoting rat mesenchymal stem cell proliferation and early osteogenic marker expression. In 2024, formulations of MgO/SiO₂ cement inks were optimised using sodium phosphate as a setting retarder and cellulose ethers as rheological modifiers for extrusion-based 3D printing. Post-printing calcination yielded dimensionally stable forsterite bioceramics with adjustable porosity and compressive strength, demonstrating the feasibility of additive manufacturing for patient-specific cancellous bone scaffolds.

Forsterite-Based Bioceramics for Bone Tissue Engineering publication trend

The graph below shows the total number of articles in forsterite-based bioceramics for bone tissue engineering across all publications each year (not limited to Nature Index journals).

Technical terms

Forsterite (Mg₂SiO₄): A magnesium silicate ceramic with high mechanical strength and biocompatibility used in bone scaffolds.

Bioceramics: Ceramic materials engineered for compatibility with biological tissues, often used in bone repair.

Sol–gel method: A wet-chemical process to form ceramic powders by transitioning a colloidal solution into a solid gel.

Hydrothermal treatment: A temperature-controlled aqueous process used to deposit or crystallise coatings such as hydroxyapatite.

Photothermal effect: The conversion of light energy into heat to achieve antimicrobial action.

Porogen: A sacrificial agent incorporated into a scaffold precursor to generate controlled porosity upon removal.

Additive manufacturing: Layer-by-layer fabrication of structures from digital models, commonly referred to as 3D printing.

Osteogenic differentiation: The process by which stem cells develop into bone-forming osteoblasts under specific biochemical cues.

References

1. The physicochemical and biomechanical profile of forsterite and its osteogenic potential of mesenchymal stromal cells. PLOS ONE (2019).
2. Forsterite-hydroxyapatite composite scaffolds with photothermal antibacterial activity for bone repair. Journal of Advanced Ceramics (2021).
3. Synthesis and Characterization of Porous Forsterite Ceramics with Prospective Tissue Engineering Applications. Materials (2022).
4. Effect of Sodium Phosphate and Cellulose Ethers on MgO/SiO2 Cements for the 3D Printing of Forsterite Bioceramics. Applied Sciences (2024).