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| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
1
|
| pubmed:dateCreated |
1983-2-14
|
| pubmed:abstractText |
A recently developed dynamic mechanical analysis technique was utilized to determine the setting rates of dental amalgams. Via a compound parallel beam apparatus the dynamic mechanical properties of five amalgam materials were continuously measured at 37 degrees C within ca. 7 min after the start of trituration. Over a 15 hr period results showed that the modulus of elasticity (Ea) increased from 1.2 X 10(10) Pa to 6.5 X 10(10) Pa--the latter generally approaching those values reported via ultrasonic techniques. Moduli results via compression tests on microspecimens (3 X 2 X 1 mm) paralleled previous reliable literature data, nominally yielding values for Ea of 2-3 X 10(10) Pa. The extent of Ea scatter from both inter- and intrapreparer experiments appeared similar, although superior technique generally could be recognized by a systematic shift of the mean results to higher Ea's. In addition to modulus studies both compressive strengths (sigma max) and their corresponding strains (epsilon) were measured on microspecimens at a strain rate (epsilon) of 0.031 min-1, with a significant increase being noted in sigma max for the one material tested at over an order of magnitude increase in epsilon.
|
| pubmed:grant | |
| pubmed:language |
eng
|
| pubmed:journal | |
| pubmed:citationSubset |
IM
|
| pubmed:chemical | |
| pubmed:status |
MEDLINE
|
| pubmed:month |
Jan
|
| pubmed:issn |
0021-9304
|
| pubmed:author | |
| pubmed:issnType |
Print
|
| pubmed:volume |
15
|
| pubmed:owner |
NLM
|
| pubmed:authorsComplete |
Y
|
| pubmed:pagination |
47-59
|
| pubmed:dateRevised |
2007-11-14
|
| pubmed:meshHeading | |
| pubmed:year |
1981
|
| pubmed:articleTitle |
Dynamic mechanical properties of amalgams.
|
| pubmed:publicationType |
Journal Article,
Research Support, U.S. Gov't, P.H.S.
|