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Droplet Sizes Emitted from Demonstration Electric Toothbrushes.

Erwin P Mark1, Michael A O Lewis2, Filippo Graziani3,4

  • 1Research & Development, Procter & Gamble Service GmbH, German Innovation Center, Frankfurter Straße 145, 61476 Kronberg, Germany.

International Journal of Environmental Research and Public Health
|March 3, 2021
PubMed
Summary
This summary is machine-generated.

Demonstration electric toothbrushes, used for dental education, emit droplets between 200-1200 µm. These findings indicate that oscillating-rotating toothbrushes do not produce aerosol-sized particles during simulated use.

Keywords:
aerosolselectric toothbrushoral hygienetoothbrushing

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Area of Science:

  • Dental hygiene
  • Aerosol science
  • Microbial transmission

Background:

  • COVID-19 pandemic highlighted microbial transmission risks in dental settings.
  • Demonstration electric toothbrushes are utilized for intra-oral education.
  • Understanding droplet emission is crucial for infection control.

Purpose of the Study:

  • To measure the size of droplets emitted by oscillating-rotating electric toothbrush heads.
  • To determine if these devices generate aerosol-sized particles.
  • To assess droplet characteristics during simulated dental education use.

Main Methods:

  • Droplet size measurement using Malvern Spraytec and DustTrak devices.
  • Simulated intra-oral use with a phantom head model.
  • High-speed video visualization of droplet emission with various fluids.

Main Results:

  • Emitted droplets ranged from 200 to 1200 µm, classified as splatter.
  • No significant aerosol-sized particles (<50 µm) were detected.
  • High-speed visualization confirmed only splatter-sized droplets.

Conclusions:

  • Oscillating-rotating electric toothbrushes primarily produce splatter, not aerosols.
  • Findings suggest minimal risk of aerosol-based microbial transmission from these devices.
  • Further research may explore other electric toothbrush designs.