ISSN:
0021-9304
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Medicine
,
Technology
Notes:
The clinical performance of somatoprosthetic materials and some elastic impression materials has been related to their resistance to tearing. In most instances, the test method used has been tear strength determinations, many of which are notoriously sensitive to variations in specimen geometry. It has been shown that the energy per unit area of new torn surface is independent of specimen geometry. Two relatively simple equations were found to determine the probable range of energies involved in tearing standardized trouser-shaped specimens regardless of the elastic properties of the materials tested. The energies so obtained for three highly extensible materials were found to be relatively independent of specimen geometry within the unstretched limits specified by ASTM test No. D 1938-62T. It is, therefore, concluded that a modification of Greensmith's trousers method for determining tear energy can be conveniently applied to extensible materials of dental interest.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/jbm.820020302
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