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Effects of mechanical ventilation and portable air cleaner on aerosol removal from dental treatment rooms.

Authors
  • Ren, Yan-Fang1
  • Huang, Qirong2
  • Marzouk, Tamer2
  • Richard, Ray3
  • Pembroke, Karen3
  • Martone, Pat3
  • Venner, Tom2
  • Malmstrom, Hans2
  • Eliav, Eli2
  • 1 Eastman Institute for Oral Health, University of Rochester Medical Center, Rochester, New York, USA. Electronic address: [email protected]
  • 2 Eastman Institute for Oral Health, University of Rochester Medical Center, Rochester, New York, USA.
  • 3 Facility Operations, University of Rochester Medical Center, Rochester, New York, USA.
Type
Published Article
Journal
Journal of dentistry
Publication Date
Feb 01, 2021
Volume
105
Pages
103576–103576
Identifiers
DOI: 10.1016/j.jdent.2020.103576
PMID: 33388387
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

To evaluate the mechanical ventilation rates of dental treatment rooms and assess the effectiveness of aerosol removal by mechanical ventilation and a portable air cleaner (PAC) with a high-efficiency particulate air (HEPA) filter. Volumetric airflow were measured to assess air change rate per hour by ventilation (ACHvent). Equivalent ventilation provided by the PAC (ACHpac) was calculated based on its clean air delivery rate. Concentrations of 0.3, 0.5 and 1.0 μm aerosol particles were measured in 10 dental treatment rooms with various ventilation rates at baseline, after 5-min of incense burn, and after 30-min of observation with and without the PAC or ventilation system in operation. Velocities of aerosol removal were assessed by concentration decay constants for the 0.3 μm particles with ventilation alone (Kn) and with ventilation and PAC (Kn+pac), and by times needed to reach 95 % and 100 % removal of accumulated aerosol particles. ACHvent varied from 3 to 45. Kn and Kn+pac were correlated with ACHvent (r = 0.90) and combined ACHtotal (r = 0.81), respectively. Accumulated aerosol particles could not be removed by ventilation alone within 30-min in rooms with ACHvent<15. PAC reduced aerosol accumulation and accelerated aerosol removal, and accumulated aerosols could be completely removed in 4 to 12-min by ventilation combined with PAC. Effectiveness of the PAC was especially prominent in rooms with poor ventilation. Added benefit of PAC in aerosol removal was inversely correlated with ACHvent. Aerosol accumulation may occur in dental treatment rooms with poor ventilation. Addition of PAC with a HEPA filter significantly reduced aerosol accumulation and accelerated aerosol removal. Addition of PAC with a HEPA filter improves aerosol removal in rooms with low ventilation rates. Copyright © 2021 Elsevier Ltd. All rights reserved.

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