Fluid shifts across human dentine in vitro in response to hydrodynamic stimuli

D. H. Pashley, W. G. Matthews, Y. Zhang, M. Johnson

Research output: Contribution to journalArticlepeer-review

82 Scopus citations


Most authorities agree that the hydrodynamic theory of dentine sensitivity best explains the stimulus response relations of most painful stimuli. However, as the usual hydrodynamic stimuli are so different it has been impossible to compare them. The equivalency of hydrodynamic stimuli can be evaluated from measurements of the fluid movement induced in vitro and relating this to the hydraulic conductance (L(p)) of the same dentine specimen. From this determination, a common denominator is obtained which is equivalent to the hydrostatic pressure that would be required to cause the same magnitude of fluid movement. The purpose of this study was to measure the direction and magnitude of fluid shifts across dentine in extracted human crown segments with a flat, dentine occlusal surface in response to the following hydrodynamic stimuli: air blast, 56°C water, 2°C water, tactile and osmotic. In acid-etched superficial dentine, which simulates hypersensitive dentine, the largest to the smallest fluid flows obtained were: hot > cold > air blast > osmotic > tactile. When these were converted to equivalency units, the ranking of stimuli from strongest to weakest was hot > cold > air blast > osmotic > tactile. This new approach to comparing hydrodynamic stimuli should be verified in vivo.

Original languageEnglish (US)
Pages (from-to)1065-1072
Number of pages8
JournalArchives of Oral Biology
Issue number11
StatePublished - Nov 1996


  • dentinal fluid movement
  • dentine sensitivity
  • hydrodynamic stimuli
  • hypersensitive dentine

ASJC Scopus subject areas

  • Otorhinolaryngology
  • Dentistry(all)
  • Cell Biology


Dive into the research topics of 'Fluid shifts across human dentine in vitro in response to hydrodynamic stimuli'. Together they form a unique fingerprint.

Cite this