Novel denture-cleaning system based on hydroxyl radical disinfection

Area of Science:

• Biomedical Engineering
• Microbiology
• Photochemistry

Background:

• Denture plaque harbors various microorganisms, posing risks for oral health.
• Traditional denture cleaning methods may have limitations in effectively eradicating all microbial contaminants.

Purpose of the Study:

• To evaluate a novel denture-cleaning device utilizing hydroxyl radicals generated via hydrogen peroxide (H2O2) photolysis.
• To assess the antimicrobial efficacy of the device against common oral pathogens found on dentures.

Main Methods:

• Hydroxyl radical generation was achieved through the photolysis of hydrogen peroxide (H2O2).
• Electron spin resonance (ESR) was employed to quantify hydroxyl radical yield.
• Antimicrobial efficacy was tested against Staphylococcus aureus, Pseudomonas aeruginosa, methicillin-resistant S. aureus (MRSA), and Candida albicans.
• A clinical test evaluated the device's performance in reducing microorganisms in denture plaque.

Main Results:

• Hydroxyl radical yield positively correlated with H2O2 concentration and light irradiation time.
• Significant microbial reduction (>5-log) was observed for S. aureus, P. aeruginosa, and MRSA within 10 minutes using 500 mM H2O2.
• Candida albicans showed a >4-log reduction within 30 minutes with 1,000 mM H2O2.
• Clinical testing demonstrated an approximate 7-log reduction of denture plaque microorganisms within 20 minutes.

Conclusions:

• Photolysis of hydrogen peroxide effectively generates hydroxyl radicals for microbial disinfection.
• The novel denture-cleaning device demonstrates potent antimicrobial activity against key oral pathogens.
• The device offers a promising and effective solution for reducing microbial load in denture plaque.