Effects of a multilayered DNA/protamine coating on titanium implants on bone responses

Area of Science:

• Biomaterials Science
• Dental Implantology
• Tissue Engineering

Background:

• Dental implants made of titanium (Ti) are crucial for tooth replacement.
• Osteogenic properties of DNA coatings on Ti implants are of significant interest.
• Enhancing osseointegration is key to successful dental implant outcomes.

Purpose of the Study:

• To evaluate the in vitro and in vivo bioactivities of a multilayered DNA/protamine (D/P) coating on Ti implants.
• To assess the effect of D/P coating on apatite deposition and new bone formation.
• To investigate the early-stage bone healing response to D/P-coated Ti implants.

Main Methods:

• Fabrication of multilayered D/P coatings on Ti implants using a layer-by-layer technique with different DNA fragment sizes (300 bp and 7000 bp).
• In vitro evaluation using simulated body fluid (SBF) immersion experiments to assess apatite deposition.
• In vivo evaluation through implantation into rat molar extraction sockets to determine bone-to-implant contact (BIC) ratio.

Main Results:

• Multilayered D/P coatings were successfully confirmed using X-ray photoelectron spectroscopy and Fourier-transform infrared spectroscopy.
• Enhanced apatite deposition was observed on D/P-coated Ti implants compared to non-treated implants in SBF.
• Significantly higher BIC ratios were found in D/P-coated implants at 3 weeks post-implantation, indicating accelerated early bone formation.

Conclusions:

• Multilayered DNA/protamine coatings promote apatite formation and enhance early bone healing around titanium dental implants.
• The D/P coating shows potential for improving the osseointegration of dental implants.
• Further research may explore long-term effects and clinical applications of these biomimetic coatings.