Efficacy of personal protective equipment against coronavirus transmission via dental handpieces.
Severe acute respiratory syndrome-coronavirus 2
aerosols
communicable disease control
dental equipment
face shields
high-volume evacuation
masks
personal protective equipment
respirators
Journal
Journal of the American Dental Association (1939)
ISSN: 1943-4723
Titre abrégé: J Am Dent Assoc
Pays: England
ID NLM: 7503060
Informations de publication
Date de publication:
08 2021
08 2021
Historique:
received:
10
01
2021
revised:
28
02
2021
accepted:
15
03
2021
entrez:
30
7
2021
pubmed:
31
7
2021
medline:
4
8
2021
Statut:
ppublish
Résumé
This laboratory study was done to evaluate the efficacy of personal protective equipment (PPE) and high-volume evacuation (HVE) against the spread of human coronavirus type 229E (HCoV-229E) during a standard dental procedure. Patient and operator manikins were used to recreate a dental setting inside a custom-built class III cabinet-like chamber. The mouth of the patient manikin was inoculated with an HCoV-229E suspension, the viral load of which was similar to that of asymptomatic people infected with severe acute respiratory syndrome coronavirus 2. The dental procedure was performed with an air turbine handpiece and HVE for 10 seconds. The efficacy of surgical masks, N95 (filtering facepiece class 2) and filtering facepiece class 3 respirators, and face shields was tested via quantitative real-time polymerase chain reaction. The wide surface on which the inoculum was spread caused low contamination. Over the external surfaces of masks and respirators, when a face shield was not worn, viral loads ranged from 1.2 through 1.4 log All PPE combinations significantly reduced viral loads in the operator manikin's mouth to below the detection limit, but HVE did not decrease viral contamination. Although caution is suggested when removing and disposing of PPE to avoid self-contamination, the combination of PPE and face shields drastically decreases the risk of transmitting human coronavirus during aerosol-generating dental procedures.
Sections du résumé
BACKGROUND
This laboratory study was done to evaluate the efficacy of personal protective equipment (PPE) and high-volume evacuation (HVE) against the spread of human coronavirus type 229E (HCoV-229E) during a standard dental procedure.
METHODS
Patient and operator manikins were used to recreate a dental setting inside a custom-built class III cabinet-like chamber. The mouth of the patient manikin was inoculated with an HCoV-229E suspension, the viral load of which was similar to that of asymptomatic people infected with severe acute respiratory syndrome coronavirus 2. The dental procedure was performed with an air turbine handpiece and HVE for 10 seconds. The efficacy of surgical masks, N95 (filtering facepiece class 2) and filtering facepiece class 3 respirators, and face shields was tested via quantitative real-time polymerase chain reaction.
RESULTS
The wide surface on which the inoculum was spread caused low contamination. Over the external surfaces of masks and respirators, when a face shield was not worn, viral loads ranged from 1.2 through 1.4 log
CONCLUSIONS
All PPE combinations significantly reduced viral loads in the operator manikin's mouth to below the detection limit, but HVE did not decrease viral contamination.
PRACTICAL IMPLICATIONS
Although caution is suggested when removing and disposing of PPE to avoid self-contamination, the combination of PPE and face shields drastically decreases the risk of transmitting human coronavirus during aerosol-generating dental procedures.
Identifiants
pubmed: 34325779
pii: S0002-8177(21)00166-5
doi: 10.1016/j.adaj.2021.03.007
pmc: PMC7997726
pii:
doi:
Substances chimiques
Aerosols
0
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
631-640Informations de copyright
Copyright © 2021 American Dental Association. Published by Elsevier Inc. All rights reserved.
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