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Updated: Jan 28, 2026

Mimicking and Measuring Occlusal Erosive Tooth Wear with the "Rub&Roll" and Non-contact Profilometry
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Cup-Shaped Tooth Wear Defects: More than Erosive Challenges?

Jan L Ruben1, F Joost M Roeters2, Gert-Jan Truin3

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Summary

Mechanical loading combined with acidic challenges are necessary for dental cups to form on tooth enamel. This study investigated in vitro cup formation to understand the clinical process.

Keywords:
Bite forceProfilometryTooth abrasionTooth erosionTooth wear

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Area of Science:

  • Dental research
  • Biomaterials science
  • Tooth wear mechanisms

Background:

  • The precise mechanism behind the formation of cups and grooves on occlusal tooth surfaces remains largely unknown.
  • Understanding these mechanisms is crucial for addressing clinical tooth wear and degradation.

Purpose of the Study:

  • To investigate the factors contributing to in vitro cup formation on human molar teeth.
  • To elucidate the clinical processes involved in the development of occlusal tooth surface features.

Main Methods:

  • Extracted human molar teeth were subjected to acidic solutions (pH 4.8 and 5.5) under varying mechanical loads (0N, 30N, 50N) for 3 months.
  • Non-contact profilometry was used to measure height and volume loss before and after exposure.
  • Scanning electron microscopy, light microscopy, and micro-computed tomography were employed to analyze wear and cupping lesions.

Main Results:

  • Significant height and volume loss occurred at pH 4.8, particularly under higher mechanical loads (50N vs 0N, p < 0.002).
  • Cup-shaped lesions were exclusively observed at pH 4.8 in teeth subjected to mechanical loading (30N and 50N groups).
  • No significant differences in tissue loss were observed at pH 5.5 across different loading conditions.

Conclusions:

  • Dental cups can form entirely within enamel.
  • Both erosive challenges and mechanical loading are essential factors for the development of dental cups.