Abstract | 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.
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Authors | Sharanbir K Sidhu, Kelli A Agee, Jennifer L Waller, David H Pashley |
Journal | American journal of dentistry
(Am J Dent)
Vol. 17
Issue 3
Pg. 211-5
(Jun 2004)
ISSN: 0894-8275 [Print] United States |
PMID | 15301221
(Publication Type: Journal Article)
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Chemical References |
- Acrylic Resins
- Dentin-Bonding Agents
- Glass Ionomer Cements
- Resins, Synthetic
- fuji IX
- ketac-molar
- carbopol 940
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Topics |
- Acrylic Resins
(chemistry)
- Analysis of Variance
- Convection
- Dentin
(metabolism)
- Dentin Permeability
(physiology)
- Dentin-Bonding Agents
(chemistry)
- Dentinal Fluid
(metabolism)
- Desiccation
- Fluid Shifts
(physiology)
- Glass Ionomer Cements
(chemistry)
- Humans
- Resins, Synthetic
(chemistry)
- Smear Layer
- Time Factors
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