Dental Mitigation Strategies to Reduce Aerosolization of SARS-CoV-2
Alexandria, Va., USA — Limiting infection transmission is central to the safety of all in dentistry, particularly during the current SARS-CoV-2 pandemic, yet many dental procedures unavoidably generate aerosols. In the study “Dental Mitigation Strategies to Reduce Aerosolization of SARS-CoV-2,” published in the Journal of Dental Research (JDR), researchers at the University of Leeds, England, UK used a ‘phantom head’ model to mimic dental procedures in a multifaceted approach to measure aerosol dispersal in a dental surgery setting and determine the potential of different mitigation strategies to reduce the infection risk to the dental team from bioaerosol exposure during routine dental procedures.
In a dental surgery setting, crown preparation and root canal access procedures were performed with an air turbine or high-speed contra-angle hand-piece (HSCAH) operated with water cooling, with mitigation via rubber dam or high-volume aspiration and a no mitigation control. A phantom head was used with a flow of artificial saliva infected with Φ6-bacteriophage, a surrogate virus for SARS-CoV-2. Bioaerosol dispersal was measured using agar settle plates lawned with the Φ6-bacteriophage host, Pseudomonas syringae. Viral air concentrations were assessed by active air sampling, and particle size and quantities were monitored using optical particle counters.
Bioaerosol levels were clearly diminished when using the HSCAH compared with the air turbine. Use of rubber dam or high volume evacuation were also effective in reducing bioaerosols and splatter.
While this model represents a worst-case scenario for possible SARS-CoV-2 dispersal, these data showed that the use of HSCAHs or other mitigation strategies can vastly reduce the risk of viral aerosolization, and suggests a prolonged clinic fallow time is not necessary.
“It is imperative to understand the inherent risks of viral dispersion associated with dental procedures and the efficacy of available mitigation strategies,” said JDR Editor-in-Chief Nicholas Jakubovics, Newcastle University, England. “To our knowledge, this study is the first to report the aerosolization in a simulated dental setting of bacteriophage, as a surrogate for SARS CoV2, as a marker for risk determination. The data described here present a clear picture of how risk of SARS-CoV-2 and similar biological hazards can be greatly attenuated using mitigation strategies including HSCAHs.”
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About the Journal of Dental Research The IADR/AADOCR Journal of Dental Research (JDR) is a multidisciplinary journal dedicated to the dissemination of new knowledge in all sciences relevant to dentistry and the oral cavity and associated structures in health and disease. The JDR 2-year Journal Impact Factor™ is 6.116, ranking #5 of 91 journals in the “Dentistry, Oral Surgery & Medicine” category, and the JDR 5-year Journal Impact Factor™ is 7.199. The JDR ranks #1 of 91 journals in total citations at 26,197 and Eigenfactor at 0.01683. The JDR Editor-in-Chief is Nicholas Jakubovics, Newcastle University, England. Follow the JDR on Twitter at @JDentRes!
International Association for Dental Research
The International Association for Dental Research (IADR) is a nonprofit organization with over 10,000 individual members worldwide, with a mission to drive dental, oral and craniofacial research for health and well-being worldwide. To learn more, visit www.iadr.org. The American Association for Dental, Oral, and Craniofacial Research (AADOCR) is the largest Division of IADR with 3,100 members in the United States. To learn more, visit www.iadr.org/aadocr.