Silicate-substituted bovine-derived hydroxyapatite as a bone substitute in regenerative dentistry

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Biomineralization

Background:

• Hydroxyapatite (HA) is crucial for bone regeneration due to its biocompatibility and osteoconductive nature.
• Its structural similarity to natural bone mineral makes it a promising material for tissue engineering.
• Integrating silicon ions can potentially enhance HA properties for bone regeneration.

Purpose of the Study:

• To synthesize and characterize silicon-doped biogenic hydroxyapatite (SiBHA) scaffolds.
• To evaluate the in vitro biological performance of SiBHA scaffolds for bone regeneration.
• To investigate the potential of SiBHA as an advanced biomaterial for dental applications.

Main Methods:

• Tailored sol-gel process for SiBHA synthesis.
• Characterization using Fourier-transform infrared spectroscopy, X-ray diffraction, energy-dispersive X-ray, and inductively-coupled plasma mass spectrometry.
• In vitro cell culture studies with Saos-2 cells and immunohistochemical analysis.

Main Results:

• SiBHA scaffolds possess an interconnected microporous structure (70% porosity, 120-650 µm pores).
• Effective silicon incorporation into the hydroxyapatite lattice was confirmed.
• SiBHA scaffolds exhibited enhanced mechanical properties (compressive strength, Young's modulus) and chemical/thermal stability.
• In vitro studies showed SiBHA promotes Saos-2 cell viability, proliferation, and osteogenic differentiation, with increased osteonectin expression.

Conclusions:

• SiBHA scaffolds demonstrate excellent biocompatibility and osteoconductive potential.
• Enhanced mechanical properties and in vitro biological activity suggest SiBHA is a promising biomaterial.
• SiBHA scaffolds are suitable for dental bone regeneration applications.