[Experimental development of a chitosan-bonded hydroxyapatite bone filling paste]

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Biomineralization

Context:

• Chitosan, a biocompatible polymer, is explored as a binder for hydroxyapatite bone-filling materials.
• Understanding chitosan solubility in various organic acids is crucial for material formulation.
• Existing bone-filling materials often require optimization for mechanical properties and setting behavior.

Purpose:

• To develop and characterize a novel hydroxyapatite bone-filling material utilizing chitosan sol as a binder.
• To investigate the influence of component ratios (CaO, ZnO) and preparation time on material properties.
• To analyze the material's solubility, setting time, compressive strength, and pH.

Summary:

• Chitosan solubility varies with organic acids; it's soluble in malic and succinic acids but not citric or oxalic acids.
• Setting time decreased with increased CaO and ZnO content but increased with higher chitosan sol ratios.
• Compressive strength was maximized when kneading occurred 90-150 minutes post-chitosan sol preparation, with higher CaO and ZnO generally improving strength.
• X-ray analysis revealed calcium crystals beyond hydroxyapatite in the hardened material.

Impact:

• This research offers insights into optimizing chitosan-based bone-filling materials for enhanced mechanical performance.
• The findings contribute to the development of advanced biomaterials for bone regeneration applications.
• Characterization of material properties provides a foundation for future clinical investigations and material refinement.