UiO-66/AgNPs Coating for Dental Implants in Preventing Bacterial Infections

Area of Science:

• Biomaterials Science
• Nanotechnology
• Infectious Disease Research

Background:

• Titanium (Ti)-based biomaterials are widely used in dental implants but lack inherent antimicrobial properties.
• Dental plaque accumulation on implant surfaces is a primary cause of implant-associated infections.
• Silver nanoparticles (AgNPs) possess broad-spectrum antibacterial activity but are prone to aggregation, reducing their effectiveness.

Purpose of the Study:

• To develop a stable and highly effective antibacterial surface modification for titanium dental implants.
• To overcome the aggregation issue of silver nanoparticles for enhanced antimicrobial performance.
• To investigate the potential of a novel nanocomposite coating for preventing dental implant infections.

Main Methods:

• Synthesized UiO-66/AgNP (U/A) nanocomposite using zirconium metal-organic frameworks (UiO-66) as a matrix to control AgNP size and prevent aggregation.
• Loaded the U/A nanocomposite onto titanium (Ti) substrates (Ti-U/A) via self-assembly deposition.
• Evaluated the antibacterial activity of Ti-U/A against methicillin-resistant Staphylococcus aureus and Escherichia coli in vitro and assessed biocompatibility in vivo.

Main Results:

• The U/A nanocomposite demonstrated significantly enhanced bactericidal activity compared to individually synthesized AgNPs, with increases of 75.51x against S. aureus and 484.50x against E. coli.
• The antibacterial mechanism involves enhanced membrane rupture by ultrafine AgNPs, leading to protein leakage and reactive oxygen species generation.
• The Ti-U/A coating exhibited excellent antibacterial properties and good biocompatibility in both in vitro and in vivo studies.

Conclusions:

• The UiO-66 matrix effectively stabilizes AgNPs, preventing aggregation and maximizing their antibacterial potential.
• The developed Ti-U/A nanocomposite coating represents a promising strategy for creating antibacterial titanium dental implants.
• This surface modification technique holds potential for significantly reducing dental implant infections and improving implant success rates.