Development of β-TCP-Ti6Al4V structures: Driving cellular response by modulating physical and chemical properties

Area of Science:

• Biomaterials Science
• Orthopedic Engineering
• Cellular Biology

Background:

• Load-bearing implant success relies on physical and chemical properties influencing cellular response.
• Combining Ti6Al4V's mechanical strength with β-Tricalcium Phosphate's (β-TCP) bioactivity can promote bone ingrowth.
• Bioactive materials are absorbed and replaced by new bone tissue during osseointegration.

Purpose of the Study:

• To design and characterize multi-material β-TCP-Ti6Al4V cellular structures for enhanced bone ingrowth.
• To investigate the correlation between material properties (roughness, wettability, β-TCP content, pH) and cellular response.
• To optimize β-TCP impregnation for improved cellular viability, distribution, morphology, and proliferation.

Main Methods:

• Fabrication of multi-material β-TCP-Ti6Al4V cellular structures.
• Characterization of surface properties: roughness and wettability.
• Quantification of β-TCP within the structures.
• Measurement of pH changes in cell culture medium due to β-TCP dissolution.
• Assessment of cellular response: viability, distribution, morphology, and proliferation.

Main Results:

• The β-TCP-Ti6Al4V structures exhibited hydrophilic behavior.
• β-TCP addition caused medium alkalization, significantly impacting cellular response.
• Higher β-TCP impregnation ratios were effective in reducing medium pH and toxicity.
• Optimized impregnation enhanced cell adhesion and proliferation.

Conclusions:

• Multi-material β-TCP-Ti6Al4V cellular structures show promise for load-bearing implants.
• Controlling β-TCP dissolution and resulting pH is crucial for optimizing cellular response.
• Higher β-TCP impregnation ratios enhance implant bioactivity and osseointegration potential.