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Volume 3 (1984)
- Issue 2 Pages 133-
- Issue 1 Pages 1-
Volume 3, Issue 1
Displaying 1-11 of 11 articles from this issue
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Hisao FUKUI, Tatsushi KAWAI, Masashi KITO, Motohiko KIKUCHI, Jiro HASE ...1984 Volume 3 Issue 1 Pages 1-7,127
Published: June 25, 1984
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSReversal or loss of setting expansion gypsum-bonded investment is studied as a function of mixing rate and CaSO4⋅2H2O content. Investments containing CaSO4⋅2H2O mixed at higher speeds (1000rpm and 1680rpm) exhibited at 24 hours reversal or loss of setting expansion which is directly related to both the speeds of mixing and CaSO4⋅2H2O content.View full abstractDownload PDF (894K) -
Hiroyuki NAKAI, Kazuomi SUZUKI, Masao IRIE, Katsuya NAGAYAMA, Hirokazu ...1984 Volume 3 Issue 1 Pages 8-19,127
Published: June 25, 1984
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSPhysical properties and microstructure of a single compositional high copper amalgam, into which tannin fluoride preparation was incorporated, was examined. A commercially available stannous fluoride incorporated low copper lathe-cut amalgam was applied as a control. Influence of immersion in water up to 12 months was also examined.View full abstractDownload PDF (3498K) -
Hiroyuki NAKAI, Kazuomi SUZUKI, Masao IRIE, Koichi ARAI, Hirokazu HASH ...1984 Volume 3 Issue 1 Pages 20-35,128
Published: June 25, 1984
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSCompressive strength was determined in various commercially available low and high copper amalgams periodically from 1 hour to 30 days and compared to the hardness reported previously.Characteristics of amalgam alloys during hardening are described.View full abstractDownload PDF (1430K) -
Hiroki OHNO, Yasuo KANZAWA, Isao KAWASHIMA1984 Volume 3 Issue 1 Pages 36-48,128
Published: June 25, 1984
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSGold alloys with 1.5wt% total In and Fe were examined by X-ray microanalysis (XMA), X-ray diffraction, and reflection electron diffraction after oxidizing at 1000°C for 1hr in air in order to elucidate the morphological changes io the oxidation zones and the oxidized surface. Internal oxidation particles composed of In2O3 and Fe-oxides precipitate in needle-like shapes near the oxidized surface and in large clusters at the grain boundaries of the alloy interior. No detectable uniform external oxidation zone by XMA was formed on the alloy containing 1.50 to 0.15wt% In and up to 1.35wt% Fe.View full abstractDownload PDF (7984K) -
Adhesion of Alkylene Glycol Monomethacrylates to Etched Enamel and Dentin SurfacesTadao FUKUSHIMA, Minoru KAWAGUCHI, Yusuke INOUE, Koji MIYAZAKI, Takash ...1984 Volume 3 Issue 1 Pages 49-55,128
Published: June 25, 1984
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThe six kinds of alkylene glycol monomethacrylates with different lengths of the alkylene group were synthesized for use as diluent, and the adhesive strengths of these monomers and 2HEMA to etched enamel and dentin surfaces were measured to investigate the effect of monomers structure on the adhesive property.View full abstractDownload PDF (1056K) -
I. Influence of components of a base sealer on its propertiesToshiyuki NAMBU1984 Volume 3 Issue 1 Pages 56-70,129
Published: June 25, 1984
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThe effect of heat treatment of ZnO and the content of rosin on the setting time and the sealability of zinc oxide-eugenol system as a base material for a new antibacterial root canal sealer were determined. It is concluded that the zinc oxide-eugenol system contained ZnO heated at 700°C and 30 percent of rosin is appropriate for the new antibacterial root canal sealer.View full abstractDownload PDF (3229K) -
Haruyuki KAWAHARA, Nobuhiro ISHIZAKI, Takatoshi MAEDA, Hiroki SAKAE1984 Volume 3 Issue 1 Pages 71-84,129
Published: June 25, 1984
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSIn order to investigate internal porosities of high fusible base alloy castings, non-destructive inspection was carried out by radiographic method with an X-ray unit. Test samples were made of cobalt-chromium and nickel-chromium alloys, and shaped into 13 steps of wedge type castings with the minimum thickness of 0.35mm and maximum thickness of 4.55mm in an incremental increase of 0.35mm. It was found that the X-ray unit could provide clear radiographs. The internal porosities of metal denture frame, crown-bridge and dental implant made of base alloy were easy to interpret by setting the exposure time to 90 seconds with three tube voltages of 50, 60 and 70kVp according to thickness of castings.View full abstractDownload PDF (6844K) -
Seiji BAN, Jiro HASEGAWA1984 Volume 3 Issue 1 Pages 85-92,129
Published: June 25, 1984
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSHeat of polymerization of Bis-GMA-TEDMA monomer mixtures, corresponding to the conceivable constituents of composite resins, was evaluated from the area of exothermic peak in DSC curves, and also the conversions of polymerization were calculated from the ratio of the heat of polymerization for each monomer mixture to an assumed one at 100% conversion. The effects of composition of monomers and environmental atmosphere on the polymerization were examined. The results suggest that increasing amounts of TEDMA in the monomer mixtures increases the length of the inhibition period for oxygen-inhibited polymerization of dimethacrylate monomers, but decreases the porosity of cured resins.View full abstractDownload PDF (2706K) -
D. BALLAND, R. GUILLARD, J.C. ANDRE1984 Volume 3 Issue 1 Pages 93-98,130
Published: June 25, 1984
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThe use of photosensitive initiators of the polymerization of composite materials used in restorative dentistry has become widespread. Experimental and theoretical studies of hardening mechanisms as a function of chemical reactions leading to polymerization and of the light dispersion due to mineral filler have been performed. Experimental profiles derived from our study deviate significantly from the classical Beer-Lambert absorption law. They demonstrated the difficulty of obtaining an homogeneous hardness of this material in the cured tooth cavity.View full abstractDownload PDF (900K) -
(Part 1) Deflection at High Temperatures in Au-Pt-Pd Alloy SystemNobuo ANDO, Masahiko NAKAYAMA, Yoshiko NISHIKAWA1984 Volume 3 Issue 1 Pages 99-109,130
Published: June 25, 1984
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSTo clarify the mechanism of distortion of cast core for porcelain fusing, the deflection of precious alloys at high temperatures was measured. The alloy composition was 80-90wt% Au, 0-20Pt, 0-10Pd. Deflection (bending) of the specimen was detected by two differential transformers. The load of 2.0gwt was necessary to measure it stably.
The deflection decreased with increase of Au and Pd contents and with decrease of Pt content. Minimum deflection was obtained in the 80-90wt% Au, 1-10Pt, 9-10Pd range. 80Au-20Pd alloy gave the maximum deflection. The deflection-beginning temperature increased with increase of Au and Pd contents and with decrease of Pt content. Both properties had a significant correlation. The alloy which deflect large begins to bend at low temperatures.View full abstractDownload PDF (1300K) -
KAZUO IDA1984 Volume 3 Issue 1 Pages 110-119
Published: June 25, 1984
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSDownload PDF (984K)
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