Nanohydroxyapatite/Titanate Nanotube Composites for Bone Tissue Regeneration

Area of Science:

• Biomaterials Science
• Nanotechnology
• Regenerative Medicine

Background:

• Bone tissue regeneration strategies are crucial for treating bone defects.
• Enhancing the osteoinduction of hydroxyapatite in situ is a key challenge.
• Nanocomposites offer promising solutions for improved bone healing.

Purpose of the Study:

• To synthesize and characterize nanohydroxyapatite and titanate nanotube (nHAp/TiNT) composites.
• To evaluate the in vitro cytotoxicity and in vivo bone regenerative potential of these composites.
• To determine the optimal TiNT concentration for enhanced bone regeneration.

Main Methods:

• Wet aqueous chemical reaction for composite synthesis at varying TiNT concentrations (1-10 wt%).
• Characterization using Raman spectroscopy, X-ray diffraction (XRD), and Scanning Electron Microscopy (SEM).
• In vitro cytotoxicity testing using murine fibroblast cell line L929.
• In vivo study using oophorectomized rat models over 15 and 30 days.

Main Results:

• TiNT addition decreased crystallite size and crystallinity index, confirming integration into the nHAp structure.
• SEM confirmed the presence of TiNTs within the nanocomposite structure.
• No significant cytotoxicity was observed for any nHAp/TiNT concentrations in vitro.
• All tested groups showed bone regeneration within 30 days, with the nHAp/TiNT10% group exhibiting statistically significant superior tissue repair compared to controls.

Conclusions:

• The synthesized nHAp/TiNT nanocomposites are non-cytotoxic and promote bone regeneration.
• The nHAp/TiNT10% composite shows the most promising results for enhanced bone tissue repair.
• These nanocomposites hold significant potential for advanced bone regeneration applications.