A Novel Resorbable Composite Material Containing Poly(ester-co-urethane) and Precipitated Calcium Carbonate...

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Biotechnology

Background:

• Polyurethanes offer tunable properties for biomaterials.
• Biodegradable composites are needed for bone tissue engineering.
• Calcium carbonate can enhance biomaterial characteristics.

Purpose of the Study:

• To synthesize and evaluate a biodegradable polyurethane-calcium carbonate composite for bone substitute applications.
• To assess the material's mechanical properties, biocompatibility, and degradation behavior.
• To investigate its potential in dental and orthodontic bone augmentation.

Main Methods:

• Synthesis of an isocyanate-terminated co-oligoester prepolymer with precipitated calcium carbonate spherulites.
• Foaming the composite to create an interconnected porous structure.
• Mechanical testing (compressive strength), in vitro cytocompatibility assays (MC3T3-E1 pre-osteoblasts), and in vitro degradation studies.
• Pre-clinical pilot trial in a porcine animal model for vertical augmentation.

Main Results:

• Foamed composites exhibited interconnected porosity and machinability.
• Compressive strength increased with higher calcium carbonate content and smaller particle size.
• Reduced pressure stability in aqueous medium was mitigated by higher calcium carbonate content.
• Excellent in vitro cytocompatibility with pre-osteoblasts was observed.
• Slower degradation rates were noted with increased calcium carbonate content.
• Successful pre-clinical evaluation in a porcine model for bone augmentation.

Conclusions:

• The developed biodegradable polyurethane-calcium carbonate composite shows significant potential as a bone substitute.
• Its tunable mechanical properties, biocompatibility, and controlled degradation make it suitable for dental and orthodontic applications.
• Pre-clinical results support its efficacy in bone augmentation procedures.