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Biomedical subjects

T Fusayama

Publications and source records attributed to T Fusayama.

At least 55 records · Page 3Linked to original sources
PubMed1981

Effectiveness of glazing composite resin restorations.

1. Microleakage was prevented when the margins of composite resin restorations were covered with a glaze. The microleakage occurred after the glaze was abraded and removed in vivo and in vitro. 2. The glaze margins gradually separated from the enamel as well as resin surfaces and fractured, creating steps which were apt to cause exogenous staining. 3. Although the glaze coated the restoration, thus producing a smooth surface, the roughness of the composite resin was exposed when the glaze was lost in the oral environment.

Composite Resins↗
PubMed1981

Effect of moisture contamination on high-copper amalgam.

Moisture contamination caused delayed excessive expansion and deterioration of the physical properties only with the non-high-copper lathe-cut alloy amalgam containing zinc, but not with the new high-copper amalgam and the non-high-copper spherical alloy amalgam containing zinc. It affected the compressive strength and creep but not the hardness. The setting dimensional change of all amalgams containing zinc was slightly affected by it.

Chemical Phenomena↗
PubMed1981

Tags penetrating dentin of a new adhesive resin.

The change of the dentinal tubules by acid-etching and the morphology and the adhering state of new adhesive composite resin tags penetrating the tubules were observed by SEM, comparing with the representative conventional composite resin. When the fractured surface of the unetched floor dentin were observed, all tubule entrances were closed by blocking with cutting debris up to 10 to 20 micrometers depth. Etching opened them by dissolving the debris and further widened the tubule entrances up to 10 to 20 micrometers depth by dissolving the peritubular dentin near the apertures. Resin tags penetrated 10 to 20 micrometers in vital teeth, 60 to 100 micrometers in freshly extracted teeth and several hundred micrometers in old extracted teeth. The tags of the new resin penetrating the tubules copied exactly the shape of the tubule walls, producing hollow depressions at the ends, indicating that the renin polymerized, adhering tightly to the walls, while those of the conventional resin produced highly tapered side walls with pointed ends, indicating that the resin shrank separating from the tubule walls on polymerization. The new resin did not produce any gap at the resin-dentin interface unlike the conventional resin.

Acid Etching, Dental↗
PubMed1980

Comparison of three luting agents.

Three types of luting cements were compared for acidity, disintegration, and film thickness. The pH during setting of the two types of polycarboxylate cements exceeded 6 after 5 hours; that of the water-settable polycarboxylate cement was the highest, almost reaching neutral. The zinc phosphate cement reached pH 3.4 after 5 hours and 5.5 after 24 hours. All cements tested showed remarkably greater disintegration in the lactic acid solution than in the distilled water. The disintegration of the water-settable zinc polycarboxylate cement in distilled watter was about half that of the other cements. The disintegration in the lactic acid solution was approximately the same for all cements tested. The film thickness was smallest with the water-settable zinc polycarboxylate cement.

Acrylic Resins↗
PubMed1980

Effect of cyanoacrylate treatment of cavity walls.

Cyanoacrylate treatment of the cavity wall for composite resin restoration failed to keep adhesion when set, but the marginal closure improved markedly both in vivo and vitro, even when thermal-cycled. It irritated the pulp slightly only at the beginning. Ethylcyanoacrylate was superior to methylcyanoacrylate in regard to adhesion, leakage and pulp response.

Adhesives↗
PubMed1979

Non-pressure adhesion of a new adhesive restorative resin.

Non-pressure adhesion of a new adhesive restorative resin was investigated employing a new tensile test. The material was adhesive to both enamel and dentin as well as to carious dentin and showed strong adhesion to all substrates tested. Etching further increased the adhesion even to dentin.

Acid Etching, Dental↗
PubMed1978

Pressuring techniques and cement thickness for cast restorations.

1. Dynamic pressure produced thinner cement films than static pressure. The cement film was thinner with vibratory pressure than with the mallet. The thickness was slightly less with vertical vibration than with horizontal vibration. Horizontal vibration seemed preferable because it could be used with increased pressure without causing trauma or pain. 2. The combination of static pressure followed by dynamic pressure produced thinner cement films than any individual pressuring technique. 3. The optimal technique for clinical use is to seat the casting by finger pressure and then apply horizontal vibration under hand pressure.

Cementation↗
PubMed1978

Measurements of cervical undercuts of human tooth crowns.

The dimensional factors of the cervical undercut of the human teeth were measured. The facial and lingual undercuts showed considerable deviations in depth, width, and inclination to the crown axis and the food stream. The proximal undercuts showed a uniform depth of 1 +/- 0.3 mm with some deviations in width and inclination.

Bicuspid↗