Novel calcium silicate/calcium phosphate composites for potential applications as injectable bone cements

Area of Science:

• Biomaterials Science
• Materials Chemistry
• Orthopedic Engineering

Background:

• Bone defects and fractures necessitate advanced bone void fillers.
• Current bone cements have limitations in biocompatibility and degradation.
• Development of novel cements with enhanced properties is crucial for orthopedic applications.

Purpose of the Study:

• To develop and characterize novel bone cements using calcium silicate, calcium phosphate, and chitosan.
• To evaluate the setting time, rheological properties, and in vitro degradation of the developed cements.
• To assess the potential of these cements for bone regeneration applications.

Main Methods:

• Solid phase: Mixture of calcium silicate and calcium phosphate powders.
• Liquid phase: Solution of chitosan, sodium phosphate, and methylcellulose.
• Characterization: Setting time, rheology, morphology, and hydroxyapatite formation in simulated body fluid.

Main Results:

• Setting times ranged from 10 to 18 minutes, indicating ease of handling.
• Rheological analysis confirmed the injectability of the composite cements.
• In vitro studies showed the cements were degradable and promoted hydroxyapatite formation.

Conclusions:

• The novel bone cements exhibit favorable handling and injectability properties.
• The cements demonstrate biocompatibility and potential for bone regeneration through hydroxyapatite formation.
• These findings suggest promising applications in orthopedic and dental fields.