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Biomedical subjects

T Fusayama

Publications and source records attributed to T Fusayama.

At least 19 recordsLinked to original sources
PubMed1997

The process and results of revolution in dental caries treatment.

The traditional system devised by G.V. Black for dental caries treatment has been fundamentally changed by the development of new knowledge about dental caries pathology and chemically adhesive resin composite. The scientific background is first discussed, together with the process of the development of new materials, following which the essence of the latest clinical techniques are described and illustrated. The system of minimal tissue reduction is extremely simple and painless, not requiring anaesthesia and is able to secure maximal longevity of restored teeth. The author describes his personal record in the development of acid etched dentine and composite restoration systems.

Acid Etching, Dental↗
PubMed1993

Ideal cavity preparation for adhesive composites.

The ideal cavity preparation for the chemically adhesive composite restoration is described on the basis of new concepts in dental caries pathology. The principal directions for the subsequent restorative technique are also briefly described.

Composite Resins↗
PubMed1992

Indications for self-cured and light-cured adhesive composite resins.

Self-cured and light-cured adhesive composite resins have biologic advantages and disadvantages. In contrast to the self-cured composite resin, the light-cured composite resin has a greater tendency to separate from a cavity wall and gingival margin. Alternative methods of insertion such as the incremental technique and cement liner have decreased the tendency to separate, but have failed to completely eliminate the problem. The light-cured composite resin may also fracture the marginal enamel rods. The light-cured composite resin is indicated for shallow facial restorations and veneers. The self-cured composite resin is indicated to restore deeper cavities, those with a dentinal gingival margin, and for occlusal restorations.

Adhesives↗
PubMed1991

Intratubular crystal deposition and remineralization of carious dentin.

An analysis of accumulated experimental results, the mechanism of intratubular crystal deposition in the transparent layer and remineralization of the matrix of carious dentin has led to a more rounded concept and understanding of dentin caries relevant to clinical practice. The transparent layer of carious dentin is not sclerotic but is part of the demineralized softened dentin. The crystal precipitation in the tubules is an intermediate product in a slow demineralization process. Physiological remineralization occurs in matrix of the inner carious dentin which has crossbanded collagen fibers and odontoblastic processes. The overall process of dentin caries is re-examined and described in view of these concepts.

Crystallization↗
PubMed1990

Posterior adhesive composite resin: a historic review.

Since development of the BIS-GMA composite resin, there have been many innovations to improve the physical properties for posterior use. Subsequent development of a caries detector and chemically adhesive composite resin has further revolutionally raised the value of composite resin restoration, replacing the traditional restorative system of mechanical approach by the new system of biological approach. In this system only the infected irreversibly deteriorated insensitive tissue, stainable with the caries detector, is removed painlessly. The cavity is immediately filled with the composite resin with no further tissue reduction for retention or resistance form or extension for prevention. Both enamel and dentin walls are etched by a single etchant without lining. The chemical adhesion to the cavity margin and wall minimizes the marginal failure in size and prevalence and prevents secondary caries penetration along the wall. The chemically adhesive composite resin is thus a useful restorative material much kinder to teeth than amalgam.

Adhesives↗
PubMed1990

The effect of etching on the dentin of the clinical cavity floor.

The most conservative cavity preparation, which takes full advantage of chemically adhesive composite resin, involves removal of only the infected outer carious dentin that is stainable by the caries detector. This preparation exposes in the cavity floor either the turbid layer at the top of the inner carious dentin or the underlying transparent layer. Examination by scanning electron microscope revealed that etching the cavity floor demineralized the intertubular dentinal surface slightly and produced tapered, cylindrical holes or ring-shaped holes at the dentinal tubule apertures of the turbid or transparent layer, respectively. The holes were blind with solid floors of intratubular crystal deposits of the transparent layer, suggesting that etching increases permeability little. Placement of the adhesive resin on the etched cavity floors produced a resin-impregnated dentinal layer and tapered, cylindrical or tubular-shaped resin tags, which apparently improved the bond and tubule aperture seal.

Acid Etching, Dental↗
PubMed1989

The addition of an adhesive composite resin to the same material: bond strength and clinical techniques.

The addition of a chemically adhesive composite resin to a restoration of the same material may be evaluated by the bond strength. This was determined after no contamination and after momentary (30 seconds), short-term (7 days), and long-term (3 months) contamination under various conditions. The momentary contamination was not removed by spray-washing the glossy surface that set under a matrix. Removing the glossy surface reduced the bond. The momentary contamination was removed by the etchant whereas the longer contamination was removed only by surface reduction. The application of etchant and bonding agents significantly strengthened the bond to the reduced surface. According to the directives drawn from this investigation, the clinical techniques were illustrated for a large restoration, a subgingival proximal restoration, repair of an open proximal contact, and repair of a worn restoration.

Composite Resins↗
PubMed1989

Adhesive resin splint.

A technique to splint mobile anterior teeth with a chemically adhesive composite is presented.

Composite Resins↗