Octacalcium Phosphate for Bone Tissue Engineering: Synthesis, Modification, and In Vitro Biocompatibility Assessment

Area of Science:

• Biomaterials Science
• Materials Chemistry
• Biomineralization

Background:

• Octacalcium phosphate (OCP) is a precursor to biological hydroxyapatite in bone tissue.
• OCP exhibits superior biocompatibility and osseointegration compared to other calcium phosphates.
• Enhancing OCP's bioactive properties is crucial for bone regeneration applications.

Purpose of the Study:

• To synthesize low-temperature octacalcium phosphate (OCP) compounds with strontium substitution.
• To investigate the phase formation of strontium-substituted OCP at physiological temperatures (35-37 °C).
• To evaluate the impact of strontium substitution on OCP's structural, microstructural, morphological, and biological properties.

Main Methods:

• Ionic substitution of strontium for calcium in solution to create strontium-substituted OCP.
• Synthesis conducted under physiological conditions (35-37 °C, normal pressure).
• Characterization of crystal lattice, microstructure, surface morphology, and in vitro biological properties.

Main Results:

• Successful synthesis of low-temperature OCP with theoretical strontium substitution up to 50 at.%.
• Established the effects of varying strontium substitution levels on OCP's properties.
• Demonstrated that strontium substitution positively influences OCP's crystal lattice, microstructure, and surface morphology.

Conclusions:

• Strontium substitution effectively enhances the biocompatibility of OCP.
• Strontium-substituted OCP shows promise for improving OCP-based composite materials for bone repair.
• The study validates the use of strontium to augment the bioactive potential of OCP for orthopedic applications.