![]() ![]() ![]() Indeed, a community of aerosol researchers is actively investigating the risks and ubiquity of airborne infections. According to a WHO report, the main transmission routes of SARS-CoV-2 are contact and droplet transmission, but the airborne transmission of virus particles can occur during aerosol-producing medical procedures in the hospital, especially in poorly ventilated indoor environments. Despite the accumulation of a considerable amount of useful information, including epidemiological analyses, genetic studies, and SARS-CoV-2 virulence factors consensus on the transmission route of COVID-19 has not been firmly established. The Coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has occasioned a serious pandemic, radically changing the life of people. While several cases of airborne transmission of COVID-19 in general clinics and emergency hospitals have been reported, cluster outbreaks in dental clinics have not yet been reported, which may indicate that AGDP does not pose a significant threat in contributing to the spread of SARS-CoV-2. This study suggests that the risk of aerosol infections is considerably limited in regular dental practice and that current standard precautions, such as mainly focusing on protection against droplet and contact infections, are sufficient. In addition, the use of extraoral suction was found to prevent the spread of aerosols from high-speed dental engines. AGDP emitted few aerosols smaller than 5 μm, which are of concern for pulmonary infections due to airborne transmission. The droplets and aerosols generated from dental devices were characterized by multimodal properties and a wide range of droplet sizes, with the majority of droplets larger than 50 μm. By discriminating between droplets and aerosols, we devised a method to measure particle size using laser diffraction analysis and evaluated aerosols generated from dental devices for providing a basis for proper infection control procedures. Aerosol-generating dental procedures (AGDP) produce droplets and aerosols, but the details of the risks of COVID-19 transmission in AGDP are not well-understood. The global outbreak of coronavirus disease 2019 (COVID-19) has raised concerns about the risk of airborne infection during dental treatment. ![]() 7Department of Orthodontics, Faculty of Dentistry, Showa University, Tokyo, Japan.6Department of Prosthodontics, Faculty of Dentistry, Showa University, Tokyo, Japan.5Department of Pediatric Dentistry, Faculty of Dentistry, Showa University, Tokyo, Japan.4Division of Dentistry for Persons With Disabilities, Department of Special Needs Dentistry, Faculty of Dentistry, Showa University, Tokyo, Japan.3Department of Oral Microbiology and Immunology, Faculty of Dentistry, Showa University, Tokyo, Japan.2Department of Implant Dentistry, Faculty of Dentistry, Showa University, Tokyo, Japan.1Division of Community-Based Comprehensive Dentistry, Department of Special Needs Dentistry, Faculty of Dentistry, Showa University, Tokyo, Japan.Learn more about our full lineup and a variety of software and consumables below.Kaoru Onoyama 1 †, Shohei Matsui 1 †, Mariko Kikuchi 1, Daisuke Sato 2, Haruka Fukamachi 3, Miki Kadena 4, Takahiro Funatsu 4,5, Yasubumi Maruoka 1, Kazuyoshi Baba 6, Kotaro Maki 7 and Hirotaka Kuwata 3 * Shimadzu is a leading manufacturer of particle size analyzers and offers a comprehensive product portfolio, such as the SALD-2300 laser diffraction particle size analyzer, which provides accurate evaluation of the change in particle size distribution in the submicron to micron range the SALD-7500nano nano particle size analyzer - a powerful tool for continuously measuring changes in particle size/distribution at one-second intervals within 7 nm to 800 µm the Aggregates Sizer, which enables the quantitative evaluation of particle amounts in the SVP range as a concentration (unit: μg/mL) and the iSpect DIA-10 dynamic image analyzer, which combines particle size and image analysis technology to offer complete particle characterization. It is widely used in R&D and quality control in industries involved with nanotechnology, pharmaceuticals, cosmetics, food, electronic materials, sintering materials, Li-ion battery electrodes, etc. Particle size analysis is a technical procedure to characterize the size distribution of particles in a powder or liquid sample. ![]()
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