Hybrid Bone Substitute Containing Tricalcium Phosphate and Silver Modified Hydroxyapatite-Methylcellulose Granules

Area of Science:

• Biomaterials Science
• Orthopedic Engineering
• Nanotechnology

Background:

• Calcium phosphate biomaterials are crucial for bone regeneration but achieving optimal properties remains challenging.
• Biomicroconcretes, combining bone cement matrices with aggregates, offer a promising avenue for enhanced bone repair.
• Understanding the synthesis-structure-property relationships in these complex hybrid systems is essential.

Purpose of the Study:

• To develop and characterize silver-modified hybrid granules using alpha-tricalcium phosphate (αTCP), hydroxyapatite (HA), and methylcellulose (MC).
• To evaluate the incorporation efficiency of these hybrid granules into αTCP-based biomicroconcretes.
• To assess the potential of these novel biomaterials for bone regeneration and infection prevention.

Main Methods:

• Synthesis and characterization of silver-modified hybrid granules (0.1 wt.% or 1.0 wt.% silver).
• Incorporation of hybrid granules into αTCP-based biomicroconcrete formulations.
• Systematic investigation of chemical composition, phase, setting times, compressive strength, microstructure, chemical stability, and bioactivity in simulated body fluid.

Main Results:

• Granule size and hybrid composition significantly impact biomicroconcrete setting times, with silver addition prolonging the process.
• Developed biomicroconcretes exhibit properties within the range of human cancellous bone, demonstrating chemical stability and bioactivity.
• The hybrid granules provide structural integrity, osteoconductivity, antimicrobial properties, and self-assembly capabilities.

Conclusions:

• Silver-modified hybrid granules can be effectively incorporated into αTCP-based biomicroconcretes for bone regeneration.
• These biomaterials offer a promising combination of osteoconductivity and antimicrobial activity, potentially preventing bacterial colonization.
• Further in vitro and in vivo studies are warranted to validate their clinical applicability for bone substitution and regeneration.