Microbial contamination of spittoons and germicidal effect of irradiation with Far UV-C 222nm krypton chloride excimer lamps

SUMMARY

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A recent study explored the effectiveness of 222-nm Far UV-C light in disinfecting dental spittoons, which are typically rinsed only with water between patients and can harbor harmful bacteria. The study aimed to address the lack of quick, efficient disinfection methods available for dental spittoons between treatments, particularly when dealing with biohazards like saliva and blood. Researchers focused on the susceptibility of oral Streptococcus and Enterococci species to Far UV-C light, a technology that is harmless to humans but lethal to microbes.

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The research found that after a 5-minute exposure to 222-nm Far UV-C, bacterial contamination on the spittoons was significantly reduced. Specifically, microbial counts, including common oral bacteria such as Streptococcus salivarius and environmental pathogens like Pseudomonas aeruginosa, were decreased by over 97%. This reduction was achieved with radiation doses between 3.6 and 13.5 mJ/cm², demonstrating that Far UV-C is highly effective at eliminating bacteria from dental spittoon surfaces. The results suggest that Far UV-C could serve as a valuable tool in preventing bacterial transmission from these surfaces during dental procedures.

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The study’s findings are particularly important given the need for improved hygiene in healthcare settings, where time constraints often prevent thorough cleaning between patients. Far UV-C technology offers a fast, efficient solution that can be safely used in occupied environments, making it ideal for reducing infection risks without disrupting patient care. The study highlights the potential of this technology to minimize the spread of bacteria in dental clinics, improving both patient and staff safety.

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