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- An Evaluation of Prescale Sheets for Measuring Pressure
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A new measuring method for mechanical pressure was recently developed by Fuji Film Company and was quickly introduced into the dental profession. It consists of two sheets, each having a different formation. When these sheets are pressed together, one of them develops a red color pattern measuring the density in proportion to the intensity of pressure exerted. At present three types of sheets are available-low, intermediate and highpressure sheets.<BR>A study was made to determine the effects of this method on measuring pressure. The results indicated that pressure from 8 to 450 kg/cm2 can be measured with an accuracy of 2.0 kg/cm2 in low-pressure sheet, 8.0 kg/cm2 in intermediate and 20.0 kg/cm2 in high and that humidity had to be precisely controlled during the measurement. For instance, the same loading of 44 kg/cm2 against low-pressure sheet brought various values of color density from 0.94 (22.0°C, 50%) to 1.35 (23.5°C, 83%) in accordance with the grade of humidity.<BR>The sheets didn't keep their original color density, but changed, espcially within the first 5-10 days after loading. During this change there was a specific density area near 1.25 where there was only a slight change in its density. Density thicker than this value became thinner and density thinner than 1.25 became thicker. After this changing period the sheets kept their concentration for 4 months.
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- 日本補綴歯科学会雑誌
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日本補綴歯科学会雑誌 24 (2), 337-344, 1980
社団法人 日本補綴歯科学会
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詳細情報 詳細情報について
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- CRID
- 1390282679390025088
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- NII論文ID
- 110003854070
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- NII書誌ID
- AN00197911
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- ISSN
- 1883177X
- 03895386
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