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Related Experiment Videos

Relationship between enamel erosion and liquid flow rate.

R P Shellis1, M Finke, M Eisenburger

  • 1Division of Restorative Dentistry, Bristol University Dental School, Lower Maudlin Street, Bristol BS1 2LY, UK. r.p.shellis@bris.ac.uk

European Journal of Oral Sciences
|June 15, 2005
PubMed
Summary

Tooth enamel erosion from soft drinks is linked to fluid flow dynamics. Higher flow rates and smaller openings significantly increase acid erosion, highlighting the need for controlled conditions in dental research.

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Area of Science:

  • Dental erosion
  • Fluid dynamics in dentistry
  • Enamel demineralization

Background:

  • Severe dental erosion is often associated with specific soft drink consumption habits.
  • Understanding the role of fluid flow in erosion is crucial for dental health and research.

Purpose of the Study:

  • To investigate the relationship between fluid flow parameters and dental enamel erosion.
  • To determine the mechanisms driving acid erosion of teeth.
  • To establish the importance of controlled fluid dynamics in in vitro dental erosion studies.

Main Methods:

  • Polished human enamel surfaces were exposed to citric acid solutions (pH 3.2) under varying flow rates (26-126 ml/min) and outlet diameters (1.0-5.0 mm).
  • Scanning electron microscopy (SEM) was used to examine enamel surface and subsurface changes.

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  • Erosion depth was measured over time and correlated with fluid velocity.

    • Main Results:

    • Erosion depth increased with exposure time, solution volume, flow rate, and decreased outlet diameter.
    • The primary mechanism of erosion was the clearance of dissolution products, not mechanical abrasion.
    • For a 20-minute exposure, erosion increased proportionally to the fourth root of liquid velocity ((liquid velocity)(1/4)).
    • The erosive potential of a low-erosivity drink did not significantly increase with liquid velocity.

    Conclusions:

    • Fluid flow dynamics, particularly velocity and confinement, significantly influence the rate of dental enamel erosion by acids.
    • Controlled and reproducible fluid flow is essential for accurate in vitro dental erosion studies.
    • The findings explain rapid erosion patterns associated with specific consumption methods like using straws or "swishing" drinks.