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Results for “DENTAL CAVITY LINING”

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At least 757 records · Page 42Linked to original sources
PubMed1991

Adhesion to dentin and physical properties of a light-cured glass-ionomer liner/base.

The objective of this study was to determine the adhesion to dentin and the physical properties of Vitrabond Light Cure Glass Ionomer Liner/Base and to compare these values with those of a conventional material, 3M Glass Ionomer Liner (3MGI). Shear bond strengths to bovine dentin after 24 h in distilled water were determined to be 12 +/- 3 MPa for Vitrabond Liner/Base, while for 3MGI, bond strengths were 4 +/- 2 MPa. The failure mode was cohesive in dentin or the ionomer. Immediate adhesion of the light-cured material was also significantly higher than that of the conventional glass-ionomer liner. Thermal cycling experiments showed that the bond of Vitrabond Liner/Base to dentin was a stable one. Adhesion studies carried out on human dentin showed high adhesion values as well. Compressive and diametral tensile strengths for Vitrabond Liner/Base were determined immediately after light curing and also after storage in water for 24 h, one week, one month, and seven months. There was no significant difference in the values of compressive and diametral tensile strengths obtained immediately after curing and after extended storage in water at 37 degrees C.

Adhesiveness↗
PubMed1991

In vitro fluoride release from a light-cured glass-ionomer liner/base.

This paper reports the results of an in vitro study of fluoride release from Vitrabond Light-Cure Glass Ionomer Liner/Base. The material released fluoride ions into the surrounding medium for up to 740 days. The rate of release of fluoride ions was independent of the cure time in the range studied. Combining a conventional polyalkenoic acid solution with the powder portion of Vitrabond Liner/Base did not significantly alter the release profile, thus indicating that light curing did not hinder the rate of fluoride release in this system. Secondary ion mass spectrometry studies of the dentin underlying the cured glass ionomer revealed that there was considerable incorporation of fluoride ions. There was no significant change in the mechanical properties of the cured cement aged in water at 37 degrees C for prolonged periods, thus indicating that long-term fluoride release did not adversely affect the strength of this material.

Composite Resins↗
PubMed1991

Bonding efficacy of erythritol methacrylate solutions as dentin primers.

The bonding efficacy of aqueous solutions of two kinds of erythritol methacrylates as dentin primers was examined by measurement of the polymerization contraction gap of a light-activated resin composite in a cylindrical dentin cavity and the tensile bond strength of the composite to the flat dentin surface. The dentin surface was cleaned with neutralized 0.5 mol/L EDTA and pre-treated with a meso-erythritol or penta-erythritol methacrylate solution, followed by application of a commercial dentin bonding agent (Clearfil New Bond) and a resin composite. Among the tested primers, a 40% meso-erythritol methacrylate solution was shown to be the most effective because, in contrast to the other primers, contraction gap formation by the composite was prevented in all tested specimens.

Composite Resins↗
PubMed2001

Trans-dentinal stimulation of tertiary dentinogenesis.

Trans-dentinal stimulation of tertiary dentinogenesis has long been recognized, and has traditionally been ascribed to diffusion of irritant substances arising during injury and restorative treatment. Identification of bio-active components, especially growth factors including TGF-beta s, sequestered within dentin matrix provides a new explanation for cellular signaling during tertiary dentinogenesis. Both isolated dentin matrix components and pure growth factors (TGF-beta s) have been shown to signal cellular events leading to reactionary and reparative tertiary dentinogenesis. Release of these bio-active components from dentin matrix may arise during carious attack and other injury to the tissue, and also during subsequent surgical intervention and restoration of the tooth. Both cavity-conditioning agents and leaching from restorative materials may contribute to release of these components. Distance of diffusion, as determined by cavity residual dentin thickness, and other restorative parameters may influence the signaling process after release of these components. Careful consideration of the interplay between tissue injury and surgical and restorative material factors is required for optimum exploitation of the exquisite regenerative capacity of dentin-pulp for more biological approaches to clinical treatment of dental disease.

Animals↗
PubMed2000

Evidence for bacterial causation of adverse pulpal responses in resin-based dental restorations.

The widespread use of resin and resin-monomers for bonding of dental restorations to dentin has occurred because of a fundamental shift in the view that injury to the pulp is induced by restorative procedures. While, for many years, the toxic effects of restorative materials were thought to be of crucial importance in the development of adverse pulpal responses, the key role of bacterial leakage at the restoration-tooth interface is now well-recognized. Consequently, if optimal conditions for the preservation of pulpal health are to be ensured, dental restorations should provide an impervious seal against the surrounding tooth structure. However, polymerization shrinkage and contraction stresses induced during setting, as well as a variety of technical difficulties encountered during the clinical operation, often produce less than perfect results. Therefore, modern restorative procedures involving resin and resin-bonded restoratives must still rely on the ability of the pulp to cope with the injurious elements to which it may be exposed during and after the procedure. This review examines factors that may govern the pulp's response to restorative procedures that involve adhesive technologies. An assessment is made of the risks involved as far as the continued vital function of the pulp is concerned. It is concluded that an intact, although thin, wall of primary dentin often enables the pulp to overcome both toxic material effects and the influences of bacterial leakage. In contrast, the pulp may not do equally well following capping of open exposures with resin composites. A dearth of controlled clinical studies in this area of dentistry calls for confirmation that pulpal health prevails over the long term following the use of total-etch and resin-bonding techniques.

Acid Etching, Dental↗
PubMed1977

Permeability and wetting properties of four cavity liners.

Four commercially available cavity liners were evaluated as to their permeability characteristics. The contact angle measurement of each liner also was calculated. S. S. White liner was found to have the lowest contact angle and permeability values with a better wetting property. Copalite, on the other hand, was found to have the highest contact angle and permeability values with a poor wetting property. Caulk varnish and Polyvar had values lying between the two materials. Copalite is the preferred material in decreasing marginal leakage because of its high contact angle, whereas the S. S. White liner is preferred in pulpal and axial surface protection because of its good wetting properties.

Adhesiveness↗
PubMed1978

Indirect pulp-capping of carious teeth with periapical lesions.

Twenty-four vital teeth with deep carious lesions associated with radiographically demonstrable periapical lesions were treated conservatively by means of the indirect pulp-capping technique. Eleven teeth showed apparent resolution of periapical pathology, an absence of pain, and continued vitality when followed up as long as seven years postoperatively.

Adolescent↗