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Biosafety devices to control the spread of potentially contaminated dispersion particles. New associated strategies for health environments

Author

Listed:
  • Victor Angelo Martins Montalli
  • Patrícia Rejane de Freitas
  • Milenna de Figueiredo Torres
  • Oscar de Figueiredo Torres Junior
  • Dienne Hellen Moutinho De Vilhena
  • José Luiz Cintra Junqueira
  • Marcelo Henrique Napimoga

Abstract

Dental procedures produce a large amount of spatter and aerosols that create concern for the transmission of airborne diseases, such as Covid-19. This study established a methodology with the objective of evaluating new associated strategies to reduce the risk of cross-transmission in a health environment by simulating spread of potentially contaminated dispersion particles (PCDP) in the environment. This crossover study, was conducted in a school clinic environment (4 clinics containing 12 dental chairs each). As a positive control group (without barriers), 12 professionals activated at the same time the turbine of dental drill, for one minute, with a bacterial solution (Lactobacillus casei Shirota, 1.5x108 CFU/mL), which had been added in the cooling reservoir of the dental equipment. In the experimental groups, the professionals made use of; a) an individual biosafety barrier in dentistry (IBBD) which consists of a metal support covered by a disposable PVC film barrier; b) a Mobile Unit of Disinfection by Ultraviolet-C, consisting of 8 UV lamps-C of 95W, of 304μW/cm2 of irradiance each, connected for 15 minutes (UV-C) and; c) the association between the two methods (IBBD + UV-C). In each clinic, 56 Petri dishes containing MRS agar were positioned on the lamps, benches and on the floor. In addition, plates were placed prior to each test (negative control group) and plates were also placed in the corridor that connects the four clinics. In the groups without barrier and IBBD + UV-C the passive air microorganisms in Petri dishes was also evaluated at times of 30, 60, 90 and 120 minutes after the end of the dental’s drill activation. The mean (standard deviation) of CFU of L. casei Shirota for the positive control group was 3905 (1521), while in the experimental groups the mean using the IBBD was 940 (466) CFU, establishing a reduction on average, of 75% (p

Suggested Citation

  • Victor Angelo Martins Montalli & Patrícia Rejane de Freitas & Milenna de Figueiredo Torres & Oscar de Figueiredo Torres Junior & Dienne Hellen Moutinho De Vilhena & José Luiz Cintra Junqueira & Marcel, 2021. "Biosafety devices to control the spread of potentially contaminated dispersion particles. New associated strategies for health environments," PLOS ONE, Public Library of Science, vol. 16(8), pages 1-16, August.
    • Handle: RePEc:plo:pone00:0255533
    DOI: 10.1371/journal.pone.0255533
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    References listed on IDEAS

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    1. Yuan Liu & Zhi Ning & Yu Chen & Ming Guo & Yingle Liu & Nirmal Kumar Gali & Li Sun & Yusen Duan & Jing Cai & Dane Westerdahl & Xinjin Liu & Ke Xu & Kin-fai Ho & Haidong Kan & Qingyan Fu & Ke Lan, 2020. "Aerodynamic analysis of SARS-CoV-2 in two Wuhan hospitals," Nature, Nature, vol. 582(7813), pages 557-560, June.
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