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Related Concept Videos

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The coefficient of variation measures the dispersion of the data points or distribution around the mean. Using the coefficient of variation, we can compare two data series with drastically different means or different units of measurement. The coefficient of variation for a sample and a population is expressed as a percentage of the ratio of standard deviation to the mean.
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Types of Friction Problems01:27

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Frictional coefficient during flossing of teeth.

A Y Alali1, A Al-Khabbaz2, S Michael2

  • 1Ministry of Health, Safat, Kuwait.

Dental Materials : Official Publication of the Academy of Dental Materials
|September 25, 2018
PubMed
Summary

Dental floss friction depends on surface roughness and moisture, not angulation. Waxed floss shows more wear on dry surfaces, highlighting potential side effects during dental hygiene practices.

Keywords:
Cementoenamel junctionDental flossDentineEnamelFrictionOral hygiene

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Area of Science:

  • Dental Mechanics
  • Biomaterials Science
  • Oral Hygiene

Background:

  • The friction coefficient (μ) between dental floss and teeth is crucial for understanding potential tooth surface damage and flossing efficacy.
  • Groove formation at the cementoenamel junction (CEJ) is a debated topic potentially linked to flossing mechanics.

Purpose of the Study:

  • To develop a method for measuring frictional forces and the coefficient of friction (μ) during dental flossing.
  • To investigate the influence of surface characteristics, moisture, and contact angulation on the friction between dental floss and tooth-like surfaces.

Main Methods:

  • An in-vitro study measured the friction coefficient (μ) using the Capstan equation under controlled load (100g).
  • Tests involved waxed and unwaxed nylon floss on enamel, dentine, and glass rods under dry and wet conditions.
  • Scanning electron microscopy (SEM) analyzed floss deterioration after use.

Main Results:

  • The friction coefficient (μ) varied significantly with surface type and moisture: highest on smooth glass (0.42), lowest on dentine (0.18).
  • Waxed floss exhibited higher friction against dry surfaces and showed greater deterioration, especially on dry enamel and glass rods.
  • No correlation was found between friction coefficient (μ) and dental floss contact angulation.

Conclusions:

  • Frictional forces during flossing are significantly influenced by surface roughness and moisture levels.
  • Contact angulation does not appear to affect the friction coefficient (μ) between dental floss and tooth surfaces.
  • The findings underscore the importance of considering material wear and potential tooth surface interactions in clinical flossing applications.