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Volume 15 (1996)
- Issue 2 Pages 77-
- Issue 1 Pages 1-
Volume 15, Issue 1
Displaying 1-7 of 7 articles from this issue
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Complete Assignment of 13C-NMR Spectrum and Geometrical Study of 5-Methacryloylaminosalicylic AcidShigeru ITO, Seiichiro FUJISAWA1996 Volume 15 Issue 1 Pages 1-10,71
Published: June 25, 1996
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThe 13C-NMR spectrum of 5-methacryloylaminosalicylic acid (MASA), including six quarternary carbon signals, was assigned through a combination of analyses of DEPT and 2DNMR spectra such as CH-cosy and the HMBC spectrum. A computer-generated empirical prediction of the 13C-NMR chemical shifts of MASA agreed with observed values except at C1 and 2'-CH3. The geometry of the methacryloylamino portion in polar and nonpolar media seemed to differ based on analyses of the combination of two-dimensional NOE experiments and a computer simulation using molecular orbital calculations.View full abstractDownload PDF (1331K) -
Osamu MIYAKAWA, Kouichi WATANABE, Seigo OKAWA, Mitsugu KANATANI, Syuji ...1996 Volume 15 Issue 1 Pages 11-21,71
Published: June 25, 1996
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThis study investigated the contamination of abraded Ti surfaces. Using a polishing machine, specimens were abraded with waterproof SiC grit papers under water cooling. The abraded surfaces were examined using element analysis, X-ray diffraction, and hardness tests. Contaminant deposits with dimensions reaching about 30μm were observed throughout the surface. In these deposits, Ti was apparently reduced by about 10% and replaced by Si and O. The chemical bond state of the Si was similar to that of SiC or a titanium silicide. The O was solute in Ti, which increased the surface hardness. The contaminant deposits were amorphous or very thin. The contamination of Ti, the extent of which was related to hardness, resulted from a reaction with abrasives.View full abstractDownload PDF (3905K) -
Contact Dermatitis caused by 2-HEMA and GM Dentin Primer Solutions applied to Guinea Pigs and HumansKazuyuki KATSUNO, Atsufumi MANABE, Kazuo ITOH, Yoshihiro NAKAMURA, Sad ...1996 Volume 15 Issue 1 Pages 22-30,71
Published: June 25, 1996
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThe purposes of this study were to examine whether 2-HEMA, GM, and methacrylic acid cause contact dermatitis, and to determine the optimum concentrations of these primers for sensitization and challenge in guinea pigs. A sensitizing concentration of 0.2% 2-HEMA resulted in strong rubefaction and several vesiculopapules in response to the challenge, and a sensitizing concentration of 0.5% GM produced strong rubefaction at 24 hours. We also observed the development of contact dermatitis on human brachia in a closed-patch test. Skin that was treated with both 2-HEMA and GM clearly showed the onset of rubefaction and itchiness. 2-HEMA caused sensitized delayed allergic reactions at all the concentrations tested.View full abstractDownload PDF (3203K) -
Seiji BAN, Shigeo MARUNO, Atsushi HARADA, Masayuki HATTORI, Kiyoharu N ...1996 Volume 15 Issue 1 Pages 31-38,72
Published: June 25, 1996
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSCalcium phosphates were electrochemically deposited on titanium plates at temperatures from 4°C to 92°C in a solution of NaCl, K2HPO4 and CaCl2⋅2H2O. Scanning electron microscopic studies showed that granular deposits formed on the electrode at electrolyte temperatures of 4°C, 22°C, and 37°C; needle-like deposits formed at 52°C-92°C. The width and length of the needles increased with the temperature of the electrolyte. Based on the results of characterization by electron diffractometry, Fourier transform infrared spectroscopy and X-ray diffractometry, the granular deposits were identified as carbonate-containing calcium phosphate with low crystallinity, and the needle-like deposits as carbonate-containing apatite crystals elongated along the c-axis. Crystallinity of the deposits increased with the temperature of the electrolyte, whereas the orientation indices of the apatite increased with temperature up to 82°C and slightly decreased at 92°C.View full abstractDownload PDF (2893K) -
Chihiro TANI, Atsufumi MANABE, Kazuo ITOH, Hisashi HISAMITSU, Sadao WA ...1996 Volume 15 Issue 1 Pages 39-44,72
Published: June 25, 1996
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSPhysical changes in the surface characteristics of dentin during bonding procedures were evaluated by measuring the contact angles of three standard liquids, to determine the surface free energy, and that of a commercially available dual cured dentin bonding agent dropped on the primed dentin surface. The commercial dentin bonding agent did not form a hemispherical shape on the ground dentin surface, probably because it penetrated into the smear layer due to the microcapillary effect. Not could the contact angle be measured on the dentin surfaces treated with any of four experimental primers, because the bonding agent rapidly spread over the primed dentin surface. It was concluded that the priming of the dentin surface after removing the smear layer served to increase the surface free energy and to improve the wettability of the bonding agent on the dentin.View full abstractDownload PDF (2363K) -
Rintaro TERATA, Shin YOSHINAKA, Kaoru NAKASHIMA, Minoru KUBOTA1996 Volume 15 Issue 1 Pages 45-50,73
Published: June 25, 1996
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSWe investigated the effect of resinous temporary material on the tensile bond strength of resin luting cement to enamel and to dentin. Four hundred bovine incisor teeth were randomly divided into groups. Four resinous temporary materials and four resin luting cements were used. On enamel, none of the resinous temporary materials decreased the tensile bond strength of the cements. On dentin, all the resinous temporary materials decreased the tensile bond strength of the cements except one containing 4-META/MMA-TBB.View full abstractDownload PDF (957K) -
Shozo TSURUTA, Joachim VIOHL1996 Volume 15 Issue 1 Pages 51-57,73
Published: June 25, 1996
Released on J-STAGE: February 12, 2009
JOURNAL FREE ACCESSThe influence of storage in various environments on the hardness of four commercial light-cured glass polyalkenoate cements and one conventional glass polyalkenoate cement was investigated. Specimens with or without light exposure were stored for 7 days in different humidity conditions. A hardness tester with a diamond indenter point was used and Vickers hardness numbers under minor load conditions were determined. Non-light-exposed specimens did not increase in hardness in either dry or wet conditions. Lightexposed specimens became harder with time in dry conditions. Light-exposed specimens stored in wet conditions hardened only slightly. To investigate the effects of humidity, some light-exposed specimens stored first in wet conditions were stored another 7 days in dry conditions. They became as hard as those first stored in dry conditions for 7 days. It is concluded that the hardness of these cements corresponds with the humidity of the storage environment.View full abstractDownload PDF (1078K)
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