Motion pictures were used to measure the elastic recovery of polysulfide base impression materials during clinically simulated undercut removals. Recovery was complex; it involved strain gradients, withdrawal rates, and material thickness. Behavior could be correlated to tests on specimens of simpler geometries. Materials tested were found to be acceptable for clinical use.
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References
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Guide to Dental Materials and Devices, 5th ed, Chicago: American Dental Association , 1970-1971, pp 185-191.
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Rodriguez, F.: Principles of Polymer Systems, New York: McGraw Hill Book Co., 1970, pp 144-253.
