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Related Experiment Videos

Dentin deformation after scratching with clinically-relevant forces.

Jean Camps1, Jean Pierre Salomon, Bart Van Meerbeek

  • 1Unité IMEB, Faculté d'Odontologie, 27 Boulevard Jean MOULIN, 13385 Marseille Cedex 5, France.

Archives of Oral Biology
|June 12, 2003
PubMed
Summary

Scratching dentin with dental explorers causes permanent deformation, supporting the hydrodynamic theory of dentin sensitivity. Even low forces create grooves, potentially displacing dentinal fluid and activating nerve receptors.

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Area of Science:

  • Biomaterials Science
  • Dental Mechanics
  • Oral Biology

Background:

  • Dentin sensitivity to tactile stimuli is a common clinical issue.
  • The hydrodynamic theory proposes that fluid movement within dentinal tubules activates pulpal mechanoreceptors.
  • Understanding dentin's mechanical response to stimuli is crucial for explaining sensitivity.

Purpose of the Study:

  • To investigate the permanent deformation of dentin caused by scratching with clinically relevant forces.
  • To evaluate the relationship between applied force and the resulting groove dimensions in dentin.
  • To assess the mechanical properties of dentin under tactile stimulation.

Main Methods:

  • Human dentin specimens were prepared and polished.
  • Surfaces were scratched using forces from 30 to 100 centi-Newtons (cN).

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  • Groove depth and width were measured using a profilometer; dentin hardness and SEM evaluation were also performed.

    • Main Results:

    • Dentin hardness remained constant across specimens.
    • Groove depth and width significantly increased with higher applied forces.
    • Groove depth ranged from 0.21 µm (30 cN) to 1.27 µm (100 cN); width ranged from 19.3 µm to 43.0 µm.

    Conclusions:

    • A threshold force of 30 cN (1003 MPa) was identified, causing plastic deformation of dentin.
    • While high forces did not induce significant fluid flow, they caused elastic deformation, potentially shifting dentinal fluid.
    • Findings support the hydrodynamic theory by demonstrating that dentin deformation under scratching can displace fluid, activating mechanoreceptors.