Evaluation of the efficacy of hydroxyl radical (OH•) release for disinfection of the air and surfaces in the dental clinic: an in vitro study

Background: Concerning about the quality of room air has increased exponentially. Specially in dental clinics where diary practice is characterized by the important generation of aerosols. Material and Methods: An in vitro model was used in which samples were collected from the surfaces and room air of a dental clinic before and after the use of an OH' radical generator. Results: A total of 1260 samples were collected for bacteriological analysis and 14 samples for the detection of SARS-CoV-2. Following OH' treatment, the tested surface samples showed a decrease in the number of colony forming units (CFUs) of 76.9% in TSA culture medium. The circulating room air samples in turn showed a decrease in CFUs of 66.7% in Sabouraud medium and 71.4% in Mannitol agar medium. No presence of SARS-CoV-2 was observed on the surface of the face shield. Conclusions: The disinfectant technology based on the use of hydroxyl radicals (OH') is effective in reducing the presence of moulds and yeasts and Staphylococcus in the air, and in reducing total aerobic bacteria on the tested surfaces.