Biomedicine

Abstract

Carbonate apatite (CO₃Ap) has evolved as a promising alloplastic bone graft material in periodontal and implant therapies due to its superior biological properties. Unlike hydroxyapatite (HA) and β-tricalcium phosphate (β-TCP), CO₃Ap mimics the mineral composition of natural bone, with carbonate substitution improving its resorption by osteoclasts and promoting bone turnover. Fabricated via a dissolution–precipitation reaction using calcium carbonate (CaCO₃) precursors, CO₃Ap maintains structural integrity while avoiding thermal decomposition that occurs with other manufacturing processes. The low crystallinity, high specific surface area, and dense microstructure contribute to the enhanced osteoblast differentiation and bone matrix formation. Histological studies have demonstrated CO₃Ap’s superior bone regeneration capacity compared to HA and β-TCP, with faster healing and greater bone volume observed in animal models. Its honeycomb architecture further supports osteoconductivity by facilitating cellular activity and nutrient flow. CO₃Ap’s versatility extends to applications in ridge augmentation, sinus lifts, and guided tissue regeneration. Coating titanium implants with CO₃Ap improves osseointegration and mechanical stability, while its mesoporous microspheres offer potential as drug carriers for antibiotics and bioactive molecules. Despite its advantages, CO₃Ap faces limitations such as brittleness and high solubility. Future research aims to optimize its physicochemical properties and develop cost-effective fabrication methods. Composite materials incorporating CO₃Ap with polymers, collagen, or platelet concentrates may further enhance its clinical utility. Overall, CO₃Ap represents a significant advancement in bone grafting materials, with potential for widespread application in regenerative dentistry and tissue engineering.