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Volume 1 (1982)
- Issue 1 Pages 1-
Volume 1, Issue 1
Displaying 1-8 of 8 articles from this issue
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Kunihiro HISATSUNE, Michio OHTA, Masaji YAMANE1982 Volume 1 Issue 1 Pages 1-7,91
Published: December 25, 1982
Released on J-STAGE: February 17, 2009
JOURNAL FREE ACCESSSome amount of transformation was achieved by the consumption of excess-vacancies during cooling. Homogeneous ordering resulted from the formation of microdomains in the grain interior. Hardening is due to the strain caused by the difference in crystal structure and by the fine domain size.View full abstractDownload PDF (1863K) -
Kazuo IDA, Toshihiro TOGAYA, Sadami TSUTSUMI, Masatoshi TAKEUCHI1982 Volume 1 Issue 1 Pages 8-21,91
Published: December 25, 1982
Released on J-STAGE: February 17, 2009
JOURNAL FREE ACCESSPure titanium and titanium-based alloys were cast into molds of phosphate-bonded silica or magnesia investments using a new casting machine known as the “CASTMATIC”. The properties of the castings were much better using magnesia, rather than phosphate-bonded silica, investments.View full abstractDownload PDF (5287K) -
Yoshiaki TANI1982 Volume 1 Issue 1 Pages 22-32,91
Published: December 25, 1982
Released on J-STAGE: February 17, 2009
JOURNAL FREE ACCESSThe marginal fracture toughness of several types of composite resins was determined by means of the rattler test. Microparticle-filled resins showed significantly higher marginal fracture toughness than conventional composites. Posterior restorative composites were intermediate between MFRs and conventional composites. Amalgams were inferior to restorative resins. These data correspond with the clinical findings of restorative materials.View full abstractDownload PDF (6354K) -
I. Direct Observation and Dynamic Analysis by Two-Dimensional PhotoelasticityHiroki OHNO, Osamu MIYAKAWA, Nobuhiro SHIOKAWA1982 Volume 1 Issue 1 Pages 33-46,92
Published: December 25, 1982
Released on J-STAGE: February 17, 2009
JOURNAL FREE ACCESSThe distortion of MOD patterns due to expansion of investments during setting in the casting ring was observed with the lapse of time and analyzed dynamically by two-dimensional photoelasticity using a simple idealized MOD pattern made of epoxy resin. Dimensional changes of the cervical margins of the MOD castings, which are important in adapting abutment teeth, are discussed in terms of a simplified model of the deformation.View full abstractDownload PDF (4508K) -
II. Influence of W/P Ratio, Pattern Position in the Ring, and the Condition of the Asbestos LiningHiroki OHNO, Osamu MIYAKAWA, Nobuhiro SHIOKAWA1982 Volume 1 Issue 1 Pages 47-54,92
Published: December 25, 1982
Released on J-STAGE: February 17, 2009
JOURNAL FREE ACCESSMOD patterns are distorted by expansion of the investment during setting in the casting ring. Using a simple idealized epoxy resin MOD pattern and two-dimensional photoelasticity, this investigation reports the distortion under several conditions, including W/P ratios, cases with and without asbestos lining, number of asbestos layers, condition of the asbestos lining (dry, wet, and applied silicone oil and vaseline), and the position of the MOD pattern in the ring.View full abstractDownload PDF (2432K) -
II Determination of Paraffin Crystal SizeKouichi WATANABE, Seigo OKAWA, Osamu MIYAKAWA, Syuji NAKANO, Nobuhiro ...1982 Volume 1 Issue 1 Pages 55-66,93
Published: December 25, 1982
Released on J-STAGE: February 17, 2009
JOURNAL FREE ACCESSTo estimate the paraffin crystal size, small-angle x-ray scattering has been conducted. For the specimen compressed uniaxially, a very long period (155Å) has been found which is interpreted as a lamellar thickness. Moreover, this thickness remains unchanged during the recovery process.View full abstractDownload PDF (4322K) -
Hiroyuki ARIKAWA, Koichi FUJII, Takahito KANIE, Kazuhiko JOSHIN, Katsu ...1982 Volume 1 Issue 1 Pages 67-72,93
Published: December 25, 1982
Released on J-STAGE: February 17, 2009
JOURNAL FREE ACCESSA method for measuring the setting characteristics of elastomeric impression materials is described. In addition, the setting characteristics of a number of elastomeric impression materials are presented and discussed.View full abstractDownload PDF (2087K) -
Toshiko MORI1982 Volume 1 Issue 1 Pages 73-80,93
Published: December 25, 1982
Released on J-STAGE: February 17, 2009
JOURNAL FREE ACCESSAddition of boric acid suppressed the thermal contraction of cast gypsum between 200 and 400°C and delayed the transformation of CaSO4 (III) to CaSO4 (II). When heated to temperatures above 150°C boric acid forms a viscous liquid and this is responsible for the suppression of contraction and the delayed transformation.View full abstractDownload PDF (1307K)
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