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Volume 27 (2008)
- Issue 6 Pages 455-
- Issue 4 Pages 283-
- Issue 3 Pages 239-
- Issue 1 Pages 1-
Volume 27, Issue 4
Displaying 1-4 of 4 articles from this issue
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Original Articles
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Yuki NAGAMATSU, Ker-Kong CHEN, Noriaki KITA, Kiyoshi TAJIMA, Hiroshi K ...2008 Volume 27 Issue 4 Pages 283-290
Published: July 25, 2008
Released on J-STAGE: April 28, 2018
JOURNAL FREE ACCESSElectrolyzed neutral water has been gradually used for sterilization in clinical dentistry because of its excellent stability of the bactericidal activity and the least corrosiveness to metals. In this study, effects of this water on the surface property of the enamel were examined and compared with those of other electrolyzed water. Marked decalcification of the enamel surface was found with immersion time in the strong acid water by the macroscopic and microscopic observations. In the weak acid water, a symptom of slight decalcification was observed in SEM image. On the other hand, no changes in surface texture were found in the neutral water similarly in the tap water. It was suggested that the electrolyzed neutral water might be the most acceptable for clinical use among the three types because it showed no harmful effects on enamel in addition to its lower corrosiveness to metals and little smell of chlorine.View full abstractDownload PDF (1444K) -
Hideharu HIROSE, Setsuko SAKAGUCHI, Hisako HIRAGUCHI, Masahiro KAKETAN ...2008 Volume 27 Issue 4 Pages 291-300
Published: July 25, 2008
Released on J-STAGE: April 28, 2018
JOURNAL FREE ACCESSThermogravimetric analysis of 46 casting ring liners in 9 groups was performed to investigate the effect of the organic binder component in the ring liners on the thermal expansion of gypsum-bonded cristobalite investments. As the results, the weight of the ring liner started decreasing from around 250℃ on the rise in temperature until around 550℃. The peak temperature of the largest peak in the differential of the thermogravimetric (DTG) curve was over 290℃ for all ring liners. In the casting ring lined with a ring liner, the temperature range showing the rapid expansion of gypsum-bonded cristobalite investments was possibly shifted to the high temperature side.View full abstractDownload PDF (1168K) -
Maki NII, Masafumi KIKUCHI, Keiichi SASAKI, Osamu OKUNO2008 Volume 27 Issue 4 Pages 301-306
Published: July 25, 2008
Released on J-STAGE: April 28, 2018
JOURNAL FREE ACCESSIn this paper, the influence of the wax pattern and casting mold sizes on the relationship between heating time and mold temperature was investigated using gypsum-bonded investment for quick heating, and the appropriate usage of the investment was studied. Molds with three types of wax pattern and three types of mold size were made. While the mold was being heated in the electric furnace at 700℃, temperature data were collected from eleven thermocouples set inside and outside the mold. The temperature of the central part of the mold became lower than that of the surrounding part at the minimum heating time given in the manufacturer's instructions, as the wax pattern became smaller or the mold size became larger. Therefore, the heating time should be long enough to ensure the uniformity of the mold temperature, even though the investment for quick heating is used.View full abstractDownload PDF (958K) -
Masayuki HATTORI, Shinji TAKEMOTO, Masao YOSHINARI, Eiji KAWADA, Yutak ...2008 Volume 27 Issue 4 Pages 307-313
Published: July 25, 2008
Released on J-STAGE: April 28, 2018
JOURNAL FREE ACCESSThis study evaluated the shear bond strength of a dental hard resin to bovine enamel and dentin with four dual-curing adhesive resin cements and the effect of thermal cycling (5,000 times) on the bond strength. The shear bond strength to bovine enamel was 13-26 MPa, and the strength of resin cement was suggested to affect the bond strength. The shear bond strength to bovine dentin showed 8-16 MPa, and it was also suggested that the bond strength depended on the dentin surface decalcification treatment. The thermal cycling did not markedly affect the shear bond strength in any dual-curing adhesive resin cements except for the dentin specimen with Bistite II.View full abstractDownload PDF (2349K)
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