Bioactive Dental Resin Composites with MgO Nanoparticles

Area of Science:

• Biomaterials Science
• Dental Materials
• Nanotechnology

Background:

• Dental resin composites are widely used but prone to biofilm accumulation.
• Biofilm on composites leads to secondary caries and restoration failure.
• Novel antibacterial fillers are needed to enhance composite performance.

Purpose of the Study:

• To investigate the effect of magnesium oxide nanoparticles (MgONPs) as antibacterial fillers in dental resin composites.
• To evaluate the impact of MgONPs on biofilm inhibition, cytotoxicity, mechanical properties, and aging resistance.
• To assess MgONPs' influence on photoactivated polymerization and curing depth.

Main Methods:

• Incorporation of varying weight fractions (1-15%) of MgONPs into dental resin composites.
• Assessment of antibacterial activity against human salivary plaque biofilm.
• Evaluation of cytotoxicity on human gingival fibroblasts.
• Testing of mechanical, physicochemical properties, and aging resistance via thermocycling.

Main Results:

• MgONPs significantly enhanced anti-biofilm capability, even at 2 wt %.
• Mechanical, physicochemical, and biocompatibility properties remained unaffected.
• Thermocycling suggested improved aging resistance.
• MgONPs potentially enhanced photoactivated polymerization and curing depth.

Conclusions:

• MgONPs are a promising strategy for developing effective antibacterial dental resin composites.
• Low concentrations of MgONPs can mitigate cariogenic biofilm formation and secondary caries.
• MgONPs offer a viable approach to improve the clinical performance and durability of dental restorations.