Surface functionalization of PEEK with silicon nitride.

Area of Science:

• Biomaterials Science
• Orthopedic Surgery
• Materials Engineering

Background:

• Skeletal implants require surface roughness, bioactivity, and antibacterial properties for optimal performance.
• Polyetheretherketone (PEEK) is a common biomaterial for implants, but its surface properties can be enhanced.
• Silicon nitride (β-Si3N4) exhibits desirable osteogenic and antibacterial characteristics.

Purpose of the Study:

• To functionalize the surface of PEEK with silicon nitride (β-Si3N4) particles.
• To create a porous PEEK surface with enhanced bioactivity and antibacterial capabilities.
• To evaluate the potential of this modified PEEK for spinal fusion cages.

Main Methods:

• Hot-pressing a mixture of sodium chloride (NaCl) and β-Si3N4 onto a PEEK surface.
• Leaching NaCl particles with water to create a porous structure.
• Embedding approximately 15 vol% β-Si3N4 particles within the porous PEEK surface.

Main Results:

• A porous PEEK surface embedded with β-Si3N4 particles was successfully fabricated.
• The functionalized surface exhibited osteogenic properties.
• The modified surface demonstrated significant antibacterial activity.

Conclusions:

• Surface enhancement of PEEK with β-Si3N4 is a viable strategy to improve implant performance.
• The porous, β-Si3N4-embedded PEEK surface shows promise for spinal fusion cages.
• This approach could facilitate bone growth (arthrodesis) and resist bacterial infections in orthopedic implants.