The Journal of the Japanese Society for Dental Materials and Devices
Online ISSN : 2188-4188
Print ISSN : 0286-5858
ISSN-L : 0286-5858
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Volume 18, Issue 4
Displaying 1-7 of 7 articles from this issue
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Original Article
  • Effects of Functional Water or Invert Soap on Disinfection and Material Properties of Dental Gloves
    Asami SUZUKI, Taira MIYASAKA, Takaichi YOSHIDA
    1999 Volume 18 Issue 4 Pages 263-268
    Published: July 25, 1999
    Released on J-STAGE: April 06, 2018
    DOIhttps://doi.org/10.18939/jjdm.18.4_263
    JOURNAL FREE ACCESS
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    Disinfection and effects on the materials of dental gloves were investigated when two kinds of latex and one kind of plastic glove were immersed in two types of functional water or invert soap. Disinfection was confirmed by immersing the gloves in functional waters or invert soap for 30 seconds. The surfaces of dental gloves immersed in functional water or invert soap were examined with a scanning electron microscope. As the time that gloves were immersed increased, the change in the surface also increased. Changes in the surface of latex gloves were markedly observed by immersion in AQUA acid water. Tensile stress and tensile elongation did not change following on immersion. Therefore, pin-holes were not confirmed in the gloves.
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  • Agar/Alginate Combined Impression Systems : Effects of Additives in Agar Impression Materials and Gypsums on Their Compatibility
    Hiroyoshi HABU, Hirobumi UCHIDA, Hisami NAKAGAWA, Hisako HIRAGUCHI, Na ...
    1999 Volume 18 Issue 4 Pages 269-273
    Published: July 25, 1999
    Released on J-STAGE: April 06, 2018
    DOIhttps://doi.org/10.18939/jjdm.18.4_269
    JOURNAL FREE ACCESS
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    The effects of additives in reversible (agar) impression materials and gypsums on the compatibility of both materials were investigated. Based on a pure 9% agar material, six types of agar impression materials including ones that contained no additive, 0.5% benzalkonium chloride, 0.3% potassium sulfate, 0.5% starch, 0.1% borax and 0.3% potassium sulfate +borax were respectively prepared. Pure gypsum was mixed with distilled water or solutions of 0.3% potassium sulfate and 0.3% potassium sulfate +0.01% sodium citrate. The surface roughness of stone models obtained from the agar and agar/alginate combined impressions was measured. As a result, borax in agar was the main cause of the incompatibility of agar impression with gypsum. The addition of potassium sulfate with borax improved the incompatibility of both impressions with gypsums mixed with any solution.
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  • Effects of Immersion Disinfection of Vinyl Silicone Rubber Impressions Taken with Individual Resin Trays on Reproducibility of Stone Models
    Hisako HIRAGUCHI, Hirobumi UCHIDA, Hisami NAKAGAWA, Naoki TANABE, Hiro ...
    1999 Volume 18 Issue 4 Pages 274-280
    Published: July 25, 1999
    Released on J-STAGE: April 06, 2018
    DOIhttps://doi.org/10.18939/jjdm.18.4_274
    JOURNAL FREE ACCESS
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    The effects of immersion disinfection of both hydrophobic and hydrophilic vinyl silicone impressions taken with individual resin trays on the reproducibility of stone models were investigated. Impressions were immersed in solutions of either 2% glutaraldehyde for 30 minutes and 24 hours or l% sodium hypochrolite for 15 minutes and 24 hours. Hydrophobic vinyl silicone impressions taken with individual resin trays did not affect the reproducibility of stone models by the immersion disinfection, and proved to be stable following long-term immersion. On the other hand, the immersion disinfection of hydrophilic vinyl silicone impressions taken with the individual resin trays caused dimensional change of stone models following short-term immersion. The findings indicated that immersion disinfection of hydrophilic vinyl silicone impressions should be monitored.
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  • Agar/Alginate Combined Impression Systems : Improvement of Compatibility of Impressions with Gypsums by Fixing the Impression Surface with Weak Acid Solutions
    Hiroyoshi HABU, Naoki TANABE, Hirobumi UCHIDA, Hisako HIRAGUCHI, Hisam ...
    1999 Volume 18 Issue 4 Pages 281-286
    Published: July 25, 1999
    Released on J-STAGE: April 06, 2018
    DOIhttps://doi.org/10.18939/jjdm.18.4_281
    JOURNAL FREE ACCESS
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    To improve the compatibility of reversible hydrocolloid (agar) or agar/alginate combined impressions with dental stones, the surfaces of impressions were fixed with 5% solutions of weak acids (acetic, lactic, citric, tartaric, phosphoric and oxalic acid) for 30 seconds. Surface roughness and hardness of the stone models obtained from the control or fixed impressions were measured. The stone surfaces were also observed with a scanning electron microscope (SEM). Weak acids, except citric, effectively improved the compatibility of agar impression materials with dental stones. The fixing of agar or combined impressions with the phosphoric acid solution is recomended.
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  • A New Investment Containing Stabilized Zirconia-Capsuled Quartz for Titanium Casting : Mechanical Properties and Surface Reaction Layers of Casting
    Seigo OKAWA, Kouichi WATANABE, Mitsugu KANATANI, Syuji NAKANO, Osamu M ...
    1999 Volume 18 Issue 4 Pages 287-294
    Published: July 25, 1999
    Released on J-STAGE: April 06, 2018
    DOIhttps://doi.org/10.18939/jjdm.18.4_287
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    A non-phosphate bonded investment including quartz capsuled with stabilized zirconia was developed for casting titanium. The mechanical properties of castings were compared between the experimental investment and a commercially available phosphate-bonded silica investment. The tensile strength values were almost the same for both castings, while the elongation was higher than that of castings from the commercial investment. Although the inner hardness was almost the same for both castings, the hardness in the surface layer was lower. The reaction layer of the casting was clearly thinner. These results suggested that the capsulizing zirconia significantly reduced the reaction of molten titanium with silica, which improved the quality of titanium casting.
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  • Synthesis of Urethane Dimethacrylate and Mechanical Properties of its Polymer
    Kimiya NEMOTO, Norihiro ONISHIYAMA, Mitsuru NOMURA, Masaru ANDO, Isao ...
    1999 Volume 18 Issue 4 Pages 295-301
    Published: July 25, 1999
    Released on J-STAGE: April 06, 2018
    DOIhttps://doi.org/10.18939/jjdm.18.4_295
    JOURNAL FREE ACCESS
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    To improve the properties of dental resin, three kinds of urethane dimethacrylates (UDMA) with different atomic groups and different numbers of single bonds between the vinyl groups, were synthesized. The effects of the types of atomic group of the skeleton in the UDMA molecule on the properties of its polymer were investigated. Our finding showed that the physical and mechanical properties of the polymer were strongly dependent on the number of single bonds between the vinyl groups located at both the terminal end and the atomic group of the skeleton in the UDMA molecule. Thus, the addition of UDMA comprised of the cyclohexane to TEGDMA increased the elastic modulus and the Knoop hardness. Furthermore, the addition of UDMA containing the ethyleneglycol to TEGDMA increased the deflection, and decreased the flexural strength.
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