[Setting expansion, flow, creep, increased hardness and resistance to pressure in silver amalgams with high copper content].
Explore the source record for details and available documents.
Copper↗
Biomedical subjects
K Dermann
Publications and source records attributed to K Dermann.
[Resistance to pressure of amalgam relative to the pressure of plugging and the alloy-mercury ratio].
The resistance to pressure was tested in 320 Amalgam samples of alloy-mercury in relations of 4:3, 5:5, 5:6 and 5:7 under packing pressures of 2, 5, 10 and 15 N/mm2. These tests were made with a commonly-used and a copper-rich alloy. Very dry mixtures, which condense under low packing pressures, show low pressure resistance.
Dental Alloys↗
[The SI unit system].
The German "Law for Units of Measure" have restricted the number of units of measure acceptable for business and official dealings. As of January 1, 1978, many common units are no longer to be used. They have been replaced by less familiar units.
Germany, West↗
[Bending strength in modeling materials].
The bending strength and modulus of elasticity of 15 materials were measured. 9 of them were hard plasters. Five were plastics with filling material, one a hard plaster with copper. On the basis of modelling calculation a bending strength of 20 N/mm2 is necessary. It is exceeded by 12 of the materials and not quite attained by 3 of them.
Dental Impression Materials↗
[Compression of amalgam specimens under various loads].
To test the behavior of amalgam fillings under masticatory load, 72 cylindrical amalgam specimens (d=5mm, h=10mm) were exposed to alternating loads changing from zero pressure to a pressure of 10 N/mm2. The tests were made in a conventional and four silver amalgams rich in copper, in water baths of 30 degrees, 37 degrees, 50 degrees, and 60 degrees C. Compression of the specimens results, which increases proportionally to the cube root of the number of alternating loads and with rising temperature. The compression lies between 0.3 per cent to 5 per cent of the original length after 10,000 alternating loads, depending on amalgam and temperature. Compressive strength increased under alternating load.
Dental Amalgam↗