The Journal of the Japanese Society for Dental Materials and Devices
Online ISSN : 2188-4188
Print ISSN : 0286-5858
ISSN-L : 0286-5858
Original Article
An Apparatus for Measuring the Density of Higher-melting Dental Metals
Kazuaki HISADATatsushi KAWAIJiro HASEGAWAMakoto KATO
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1984 Volume 3 Issue 5 Pages 614-622

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Abstract
In order to measure the density of higher-melting dental metals in a wide temperature range from room temperature to about 1700℃, the previous apparatus based on the sessile drop method was advanced. By using a graphite heater, the furnace was able to meet the demand for measurements at high temperatures. By completing the optical system, the sharp shadow of the sample was taken on film even at high temperatures at which the sample radiates intensely. A texture analyzing system was composed by combining a projector through a digitizer to a microcomputer and errors caused by analyzing were discussed. The systematic error of the analyzing system was given less than 0.08%. The density of pure nickel was determined with the apparatus and the analyzing system, and the satisfactory results were obtained. Namely, the apparatus and the analyzing system were proved to be very useful to investigate the thermal shrinkage of higer-melting dental metals.
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© 1984 The Japanese Society for Dental Materials and Devices
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