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Results for “Tooth Permeability”

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At least 109 records · Page 6Linked to original sources
PubMed1984

The effect on dentine permeability of time following cavity preparation in dogs.

Cavities were prepared into the dentine of mandibular first molars of anaesthetized dogs. Conical plastic chambers were cemented into the cavities to permit quantitation of dentine permeability using a fluid-filtration technique. There was a progressive fall in dentine permeability every hour for the 6 h of study, to about 20 per cent of zero time values. The fall in dentine permeability could be delayed but not prevented, by filtering fluid across the dentine into the pulp. Similar experiments on teeth from which the pulps had been removed showed no change or a slight increase in permeability with time. No change in dentine permeability was seen in dogs killed after the zero time measurement and followed for an extra 6 h. This decrease of dentine permeability in response to cavity preparations only occurs in teeth with intact pulps.

Animals↗
PubMed1984

Effects of air-drying in vitro on human dentine permeability.

The effects of evaporation produced by air blasts of 0, 0.5, 2 or 5 min to dentine in vitro were evaluated by measuring dentine hydraulic conductance before and after each trial. When the tubules were filled with water, even prolonged evaporation had no effect on dentine permeability. Tubules filled with physiological salt solution produced a time-dependent decrease in dentine permeability. Tubules filled with 1.5 per cent albumin in water gave the largest reductions in dentine permeability. These effects were more marked in unetched as opposed to acid-etched dentine. The results suggest that part of the reduction in dentine sensitivity produced clinically by prolonged air blasts may be due to precipitation of organic and inorganic constituents of dentinal fluid at the surface.

Acid Etching, Dental↗
PubMed1981

Dentin permeability: effects of smear layer removal.

The results of this study permit the following conclusions: 1. The use of dilute (6%) citric acid for very short time intervals permits sequential removal of the smear layer on human dentin. 2. Acid-etching for as little as 5 seconds removes much of the smear layer and exposes the orifices of dentinal tubules. 3. Dentin permeability increased rapidly during acid-etching with 6% citric acid, reaching a maximum value after only 15 seconds of etching. 4. The production of a smear layer on dentin during restorative procedures establishes a protective diffusion barrier. Removal of the smear layer by acid-etching increases the permeability of dentin which, under some conditions, must be regarded as a liability.

Acid Etching, Dental↗
PubMed1987

The efficacy of resin-compatible cavity varnishes in reducing dentin permeability to free monomer.

The effectiveness of three resin-compatible cavity varnishes in reducing the dentin permeability to free monomer liquid was evaluated by means of a dentin disk mounted within a pressurized split-chamber diffusion device filled with low-viscosity aliphatic dimethacrylate. Substantial reduction in dentin permeability was obtained with all of the products tested (Microjoin, Cavi-Line, and Universal). This study suggests their likely effectiveness as a protective barrier against permeation of free monomer into the dental pulp.

Collodion↗
PubMed1990

Effect of X-ray irradiation on the permeability of bovine dental enamel.

To estimate permeability properties of bovine dental enamel, complex impedance measurements and radioisotope diffusion experiments were carried out before and after X-ray irradiation (single dose, 72 Gy) of enamel specimens. Neither impedance measurements nor diffusion experiments showed significant changes in permeability.

Animals↗
PubMed1977

Dentin permeation: comparison of diffusion with filtration.

A comparison was made between the rate of iodide permeation of dentin by diffusion and by filtration. Before acid etching, filtration only doubled the rate of iodide permeation relative to that obtained by diffusion. After acid etching, filtration produced a 32-fold increase in permeation. Acid etching, by removing occluding debris, facilitates filtration more than diffusion.

Acid Etching, Dental↗
PubMed1978

Dentin permeability: changes produced by iontophoresis.

Iontophoretic currents (0--1.0 mA) were applied to dentin disks prepared from human third molars. A negative electrode increased 125I-permeation 10X, while a positive electrode increased 14C-lidocaine 8X. Iontophoresis appears promising as a method to increase the permeation of dentin by ionized substances of therapeutic interest.

Carbon Radioisotopes↗
PubMedDate not supplied

Dentin permeability: a comparison of functional versus anatomical tubular radii.

Two independent techniques (filtration and surface tension) were developed to measure the functional tubular radii of 11 dentin and 2 glass discs. Anatomic radii were determined using SEM for comparative purposes. The functional radii of the dentin discs ranged from 5 to 40% of the anatomic radii. This differences was due to the fact that SEM visualizes only the surface while the functional techniques measure the radii within dentin tubules. It is concluded that the functional methods are preferred whenever the dynamics of fluid flow through dentin are under consideration.

Acid Etching, Dental↗
PubMed1988

Effects of distance from the pulp and thickness on the hydraulic conductance of human radicular dentin.

The purposes of this study were: (1) to measure the effect of distance from the pulp on the hydraulic conductance of human radicular dentin; (2) to determine the influence of dentin thickness on the rates of fluid flow; and (3) to attempt to correlate dentinal tubule densities and diameters with root dentin hydraulic conductance. Dentin slabs prepared from extracted, unerupted, human third molar teeth were placed in a split-chamber device to permit quantitation of fluid filtration rate (hydraulic conductance). In the SEM portion of the study, dentinal tubule numbers and diameters were recorded. The results indicated that radicular dentin hydraulic conductance decreased with distance from the pulp and with increasing dentin thickness. Tubule density and diameter correlated well with the measured hydraulic conductances. The relatively low hydraulic conductance of outer root dentin makes it a significant barrier to fluid movement across root structure.

Adult↗
PubMed1979

Permeability of the hard tissue bridge formed after pulpotomy with calcium hydroxide: a histologic study.

Analysis of these results shows that complete hard tissue bridges, aside from occurring with great frequency, produce a satisfactory protection to the pulp. In a case in which the barrier is incomplete, some future clinical problems may result as an incomplete barrier does not offer adequate protection as shown by the chronic inflammatory reaction in the remaining pulp tissue.

Animals↗