Graphic Simulation of SARS-CoV-2 Droplets: Why Respirators should be used in Dental Healthcare Settings?Correspondence Address :
Fàbio Barbosa Souza,
Av. Prof. Moraes Rego s/n, Cidade Universitària, Recife, Pernambuco, Brazil.
Introduction: Knowledge about the morphological characteristics of facial masks/respirators and their relationship with the possibility of interaction with respiratory droplets in the COVID19 pandemic is fundamental in dental healthcare settings.
Aim: This study evaluated interfibrillar gaps of cloth mask, surgical mask and Filtering Face Piece 2 (FFP 2) respirator through Scanning Electron Microscopy (SEM) in order to perform a graphic simulation of Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) respiratory droplets in the gaps among mask fibres.
Materials and Methods: A fragment (1 cm2 ) of the cloth mask were used to perform a SEM analysis. The distance among fibres was determined by Energy Dispersive Spectrometry (EDS). Graphic simulation of droplets with different sizes (0.5 Âµm; 5.7 Âµm; 12 Âµm) was performed by an image editing program (Adobe Illustrator).
Results: The image analysis showed that average distance among the fibres was 67.91 Âµm (cloth mask), 11.72 Âµm (surgical mask), 11.97 Âµm (respirator FFP2). Superimposition of masks layers resulted in no gaps between FFP2 fibres. Surgical mask exhibited openings between fibres in 1.43% of the studied total area. The cloth mask showed large gaps, in which it would be possible to transpose more than 680 million droplets (5.75 Âµm).
Conclusion: FFP2 respirator showed no spaces among fibres after superimposition of structural layers, which would promote the blockage of the graphic simulation of SARS-CoV-2 droplets.
Dentistry, Infection control, Masks, Personal protective equipment, Respiratory protective devices, Scanning electron microscopy
Date of Submission: May 29, 2020
Date of Peer Review: Jun 10, 2020
Date of Acceptance: Jun 12, 2020
Date of Publishing: Aug 01, 2020
• Financial or Other Competing Interests: None
• Was Ethics Committee Approval obtained for this study? NA
• Was informed consent obtained from the subjects involved in the study? NA
• For any images presented appropriate consent has been obtained from the subjects. NA
PLAGIARISM CHECKING METHODS:
• Plagiarism X-checker: May 30, 2020
• Manual Googling: Jun 11, 2020
• iThenticate Software: Jul 28, 2020 (16%)
ETYMOLOGY: Author Origin
- Emerging Sources Citation Index (Web of Science, thomsonreuters)
- Index Copernicus ICV 2017: 134.54
- Academic Search Complete Database
- Directory of Open Access Journals (DOAJ)
- Google Scholar
- HINARI Access to Research in Health Programme
- Indian Science Abstracts (ISA)
- Journal seek Database
- Popline (reproductive health literature)