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Related Experiment Videos

A testing system for electric toothbrushes.

H Sahota1, G Landini, A D Walmsley

  • 1School of Dentistry, University of Birmingham, UK.

American Journal of Dentistry
|September 9, 1999
PubMed
Summary
This summary is machine-generated.

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This study assessed electric toothbrush cleaning power using a cheese model. Smaller headed toothbrushes showed greater relative cleaning efficiency, suggesting a useful in vitro testing model for devices.

Area of Science:

  • Biomaterials Science
  • Dental Engineering
  • Fluid Dynamics

Background:

  • Electric toothbrushes utilize mechanical and acoustic forces for plaque removal.
  • Understanding the in vitro cleaning efficacy of different electric toothbrush designs is crucial for product development.

Purpose of the Study:

  • To evaluate the in vitro cleaning effectiveness of four electric toothbrushes.
  • To assess the contribution of mechanical and acoustic microstreaming forces in debris removal.
  • To establish an experimental model for testing electric toothbrush performance.

Main Methods:

  • Four electric toothbrushes (Braun Oral-B D7, D9, Interplak, Sonicare) were tested on a 0.2 mm cheese layer on a microscope slide.
  • Toothbrushes were operated dry, with bristles immersed in water, or with non-contact turbulence.

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  • Cheese removal area and average cleaning per brush contact area were measured using image analysis.

    • Main Results:

    • Cleaning efficiency varied between models and operating conditions (dry vs. wet).
    • Sonicare (SC) showed disruption without removal in non-contact mode; all tested brushes showed removal when in contact.
    • Larger brush heads removed more total area, but smaller heads had higher relative cleaning efficiency (average cleaning/brush contact unit area).

    Conclusions:

    • The in vitro cheese model effectively differentiated the cleaning characteristics of electric toothbrushes.
    • Relative cleaning efficiency, not just total area removed, is an important metric for evaluating toothbrush performance.
    • This model may aid in the preclinical assessment of electric toothbrush designs.