Development of a biodegradable bone cement for craniofacial applications.

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Tissue Engineering

Background:

• Biodegradable bone cements are crucial for craniofacial bone repair.
• Poly(propylene fumarate) (PPF) is a promising polyester macromer for bone tissue engineering.
• Controlling the exothermic reaction and mechanical properties of bone cements is essential for clinical success.

Purpose of the Study:

• To investigate the formulation of a two-component biodegradable bone cement using PPF and crosslinked PPF microparticles.
• To evaluate the effects of particle weight percentage, particle size, and accelerator concentration on the setting and mechanical properties of the composite bone cement.
• To assess the suitability of the developed bone cement for craniofacial bone repair applications.

Main Methods:

• A full factorial design was used to systematically vary formulation parameters.
• The study analyzed the impact of crosslinked PPF microparticle addition on temperature rise during crosslinking.
• Mechanical properties (compressive modulus and strength) and setting time were measured for various composite formulations.

Main Results:

• Addition of crosslinked PPF microparticles significantly reduced the maximum temperature rise during crosslinking (from >100°C to 28-65°C).
• Increasing particle weight percentage (25% to 50%) enhanced compressive modulus and strength while reducing maximum temperature.
• Larger particle size ranges (150-300 μm) also improved compressive modulus and strength without significantly affecting setting time or temperature.

Conclusions:

• The developed PPF-based bone cement with microparticles demonstrates significantly reduced exothermic behavior compared to PPF alone.
• Optimizing particle weight percentage and size can enhance the mechanical properties of the bone cement.
• The composite material exhibits properties suitable for further investigation in craniofacial bone defect reconstruction.