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

Abstract：

: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 (Lp) 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 degrees C water, 2 degrees 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.

journal_name

Arch Oral Biol

journal_title

Archives of oral biology

authors

Pashley DH,Matthews WG,Zhang Y,Johnson M

doi

10.1016/s0003-9969(96)00059-3

subject

Has Abstract

pub_date

1996-11-01 00:00:00

pages

1065-72

issue

11

eissn

0003-9969

issn

1879-1506

pii

S0003-9969(96)00059-3

journal_volume

41

pub_type

杂志文章

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