Document Detail


Dentine hypersensitivity: the measurement in vitro of streaming potentials with fluid flow across dentine and hydroxyapatite.
MedLine Citation:
PMID:  8381178     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Stimulus transmission across dentine, in conditions such as dentine hypersensitivity, is considered to occur via a hydrodynamic mechanism. This fluid flow in dentine may then induce a mechanoreceptor response in pulpal nerves. However, when fluid flows through a porous structure electrical potentials are also generated. The aim of this study was to develop a reproducible model system to measure streaming potential across dentine and hydroxyapatite and determine the influence of pressure. Using an acrylic cell, with silver electrodes, streaming potentials were recorded across dimensionally standardized dentine and hydroxyapatite specimens, over a pressure range of 1-6 atmospheres. Streaming potentials were found to be directly proportional to pressure and dependent on the electrical conductivity of the saline used in the cell. The results confirm the limited existing data on streaming potentials across dentine and indicate that at these low pressures excitation of pulpal nerves would not occur. However, if, as may be the case, stimuli applied to dentine create very high pressures, the resultant potentials generated could indeed evoke a neural response. The model system is worthy of further use to study this phenomenon and the factors which may influence it.
Authors:
H Griffiths; G Morgan; K Williams; M Addy
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of periodontal research     Volume:  28     ISSN:  0022-3484     ISO Abbreviation:  J. Periodont. Res.     Publication Date:  1993 Jan 
Date Detail:
Created Date:  1993-03-03     Completed Date:  1993-03-03     Revised Date:  2000-12-18    
Medline Journal Info:
Nlm Unique ID:  0055107     Medline TA:  J Periodontal Res     Country:  DENMARK    
Other Details:
Languages:  eng     Pagination:  60-4     Citation Subset:  D; IM    
Affiliation:
Department of Medical Physics, University of Wales College of Medicine, Cardiff, United Kingdom.
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MeSH Terms
Descriptor/Qualifier:
Dentin / physiology*
Dentin Sensitivity / physiopathology*
Durapatite
Electric Conductivity
Hydroxyapatites
Membrane Potentials
Models, Biological
Models, Structural
Osmolar Concentration
Osmotic Pressure
Rheology
Chemical
Reg. No./Substance:
0/Hydroxyapatites; 1306-06-5/Durapatite

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