Development of an antimicrobial resin--a pilot study

Area of Science:

• Materials Science
• Biomaterials Engineering
• Nanotechnology

Background:

• Dental caries and implant infections pose significant clinical challenges.
• Development of antimicrobial biomaterials is crucial for improved patient outcomes.
• In situ synthesis of nanoparticles offers a novel approach for material functionalization.

Purpose of the Study:

• To synthesize silver nanoparticles (AgNPs) directly within light-cure (LC) and chemical-cure (CC) acrylic dental resins.
• To characterize the synthesized AgNPs and their distribution within the resins.
• To evaluate the ion release profile and antibacterial efficacy of AgNP-loaded resins.

Main Methods:

• AgNPs were synthesized in situ using varying concentrations of silver benzoate (AgBz) in LC and CC resin systems.
• Rockwell hardness testing assessed resin cure with AgBz incorporation.
• UV-Vis spectroscopy and transmission electron microscopy (TEM) confirmed AgNP presence and morphology.
• In vitro ion release studies and antibacterial assays against Streptococcus mutans were performed.

Main Results:

• AgNPs were successfully synthesized in both LC and CC resins.
• CC resins exhibited better AgNP distribution and smaller particle sizes compared to LC resins.
• CC resins showed continuous Ag(+) ion release, while LC resins released ions above 0.1% AgBz.
• AgNP-loaded CC resins demonstrated significant in vitro antibacterial activity, with up to 97.5% inhibition of Streptococcus mutans.

Conclusions:

• In situ synthesis of AgNPs in dental resins is feasible, particularly in chemical-cure systems.
• AgNP-loaded resins show promise as antimicrobial biomaterials for dental applications.
• Further research is needed to optimize mechanical properties for commercial viability.