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Updated: Oct 2, 2025

$Measuring Spray Droplet Size from Agricultural Nozzles Using Laser Diffraction$

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Particle Size Analysis in Aerosol-Generating Dental Procedures Using Laser Diffraction Technique.

Kaoru Onoyama¹, Shohei Matsui¹, Mariko Kikuchi¹

¹Division of Community-Based Comprehensive Dentistry, Department of Special Needs Dentistry, Faculty of Dentistry, Showa University, Tokyo, Japan.

Frontiers in Oral Health

|February 28, 2022

Summary

Dental procedures generate few small aerosols, posing a limited risk for COVID-19 airborne transmission. Current infection control measures focusing on droplet and contact precautions are sufficient for aerosol-generating dental procedures (AGDP).

Keywords:

COVID-19 aerosol generating dental procedure airborne transmission dental public health infection control laser diffraction analysis particle size analysis transmission based precautions

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Area of Science:

Dentistry
Infectious Diseases
Aerosol Science

Background:

The COVID-19 pandemic raised concerns about airborne transmission during dental procedures.
Aerosol-generating dental procedures (AGDP) produce droplets and aerosols, but transmission risks are not fully understood.

Purpose of the Study:

To measure and characterize particle sizes generated by dental devices.
To assess the risk of COVID-19 airborne transmission during AGDP.
To provide data for effective infection control protocols.

Main Methods:

Utilized laser diffraction analysis to measure particle size distribution.
Differentiated between droplets and aerosols generated from dental devices.
Evaluated the efficacy of extraoral suction in mitigating aerosol spread.

Main Results:

Dental devices produced droplets and aerosols with a wide size range, mostly larger than 50 μm.
AGDP generated minimal aerosols less than 5 μm, the size relevant for airborne pulmonary infections.
Extraoral suction effectively reduced aerosol dispersion from high-speed dental engines.

Conclusions:

The risk of aerosol infection during routine dental practice is limited.
Standard precautions focusing on droplet and contact transmission are adequate for AGDP.
The absence of reported dental clinic COVID-19 outbreaks suggests AGDP is not a significant SARS-CoV-2 transmission source.