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Lookup NU author(s): Dr Sharanbir Sidhu
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Purpose: To assess the convective and evaporative fluid movement across glass-ionomer treated dentin. Methods: Crown segments made from extracted human teeth, were divided into two groups of 14 teeth each. Each segment was cemented onto a plexiglass slab penetrated by a stainless steel tube, permitting filling of the pulp chamber with water. This set-up was attached to a device that measured fluid movement through the dentin in the crown segment. The experimental design involved repeated measurements of convective and evaporative fluid movements in each of the following conditions: smear layer-covered dentin, conditioned dentin, dentin after placement of one of two glass-ionomers (Fuji IX or Ketac-Molar), with and without a protective coating. The same water fluxes were remeasured after storage of the samples for 24 hours in distilled water. Results: Statistical analysis of the results using ANOVA indicated a significant difference between the two measured water fluxes (P< 0.001). There was also a significant difference between the two materials (P< 0.001), with Ketac-Molar allowing higher permeability than Fuji IX. Conditioning the dentin surface with polyacrylic acid increased the convective water flux (P< 0.05) but did not change the evaporative water flux. Placement of the glass-ionomer material did not change the rate of spontaneous evaporation of water from the dentin, but the application of a coating agent reduced the evaporative water loss. These values were not significantly different when the specimens were stored for 24 hours.
Author(s): Sidhu SK, Agee KA, Waller JL, Pashley DH
Publication type: Article
Publication status: Published
Journal: American Journal of Dentistry
Year: 2004
Volume: 17
Issue: 3
Pages: 211-215
ISSN (print): 0894-8275
ISSN (electronic):
Publisher: American Journal of Dentistry
