Time Elapse Research Articles

Studies on Characters of Various Impression Materials by means of Holography

The present study is desined to Silicone Rubber Impression materials on manipulated condition, that is impression thickness, making and remove of impression its time elapse of mixing, have influence on occulusal surface and axial surface used with Holography.As the results of these effort, the following conclusions were obtained.1. This study is good method used with the Holography. This method can measured deformation and infinitesimal displacement of dental materials, don't touch the object and that can observe with the bodily eye.2. Silicone Rubber Impression materials showed various displacement volume severally on manipulated conditions.3. Impression surface of axial surface condition that impression thickness 1, 0mm, making of impression after 75 seconds, removed after 5 minutes its time elapse of mixing showed minimum. And the state added between occulusal surface and axial surface, that condition showed minimum displacement volume too.4. Silicone Rubber Impression materials surface keep on after 60 minutes displacement all condition that this study established.

Studies on Characters of Various Impression Materials by means of Holography

The present study is desined to Silicone Rubber Impression materials on manipulated condition, that is impression thickness, making and remove of impression its time elapse of mixing, have influence on occulusal surface and axial surface used with Holography.As the results of these effort, the following conclusions were obtained.1. This study is good method used with the Holography. This method can measured deformation and infinitesimal displacement of dental materials, don't touch the object and that can observe with the bodily eye.2. Silicone Rubber Impression materials showed various displacement volume severally on manipulated conditions.3. Impression surface of axial surface condition that impression thickness 1, 0mm, making of impression after 75 seconds, removed after 5 minutes its time elapse of mixing showed minimum. And the state added between occulusal surface and axial surface, that condition showed minimum displacement volume too.4. Silicone Rubber Impression materials surface keep on after 60 minutes displacement all condition that this study established.

Qualitative Characteristics of Rubber Vibration Isolator : Influences of Mastication and after Cure

Influences of vulcanizing temperature and time on the dynamic characteristics of hevea stocks were previously reported by the authors. In this report, dynamic properties of the tread stocks, having the same rate of chemical composition, contained different carbon blacks and accelerators, were studied under the following conditions ; (1) Influences of mastication before vulcanization. (2) Influences of cooling conditions just after vulcanizing process. (3) Variations of moduli with an elapse of time after vulcanization. Then the following results were obtained; (1) Increasing the time of mastication, less amplitude dependencies were recognized, and complex modulus and loss factor decreased. (2) Imaginary part of complex modulus and loss factor increased, and real part of complex modulus decreased by the instantaneous cooling, just after vulcanizing process. (3) Generally, complex modulus slightly increased as time elapse after vulcanization and there were differences of variant mode of their characteristics by the type of carbon black and accelerator.

On the Skulls of the Protohistoric Japanese from the Kinki District

(1) The cranium of the protohistoric Kinki Japanese is short in cranial (maximum) length, broad in cranial (maximum) breadth, and brachycran in cranial index. Their cranial (basi-bregmatic) height is low, and facial (bizygomatic) breadth is wide. Their cranial length and cranial breadth are slightly less than those of the prehistoric Ko(Kinki) Japanese, but almost equal to those of the Edo-period and of the recent Kinki Japanese. The Kinki Japanese of various eras have the brachycran cranium in the index of which shows no difference in reference to time elapse.(2) The cranial height of the protohistoric Kinki Japanese is almost the same as that of the prehistoric Ko (Kinki) Japanese; it is lower than that of the Edo-period and the recent Kinki Japanese.(3) The facial breadth of the protohistoric Japanese and the prehistoric Ko (Kinki) Japanese is wider than that of the Edo-period and the recent Kinki Japanese. This shows that there are changes in reference to time elapse in the cranial height and facial bredth of the Kinki Japanese.(4) It is considered that the protohistoric Kinki Japanese have a feature which is more akin to the prehistoric Ko (Kinki) Japanese than to the Edoperiod and the recent Kinki Japanese.The ancient Kinki Japanese whose cranial height is low and whose facial breadth is wide seem to have their cranial features changed into the modern Kinki Japanese features represented by high cranium and narrow face.