The permanent deformation-time relationship under constant load, of 15 elastomer impression materials were studied. All materials showed a greater permanent deformation under constant load than with tensile load, except the polyether material. Silicone and polyether materials exhibited perceptibly less permanent deformation than mercaptan materials ten minutes after mixing.
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References
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Kaloyannides, Th.: Elasticity of Elastomer Impression Materials: II. Permanent Deformation , J Dent Res52: 719-724, 1973.
2.
Harvey, E.W.: Modern College Physics, New York: Van Nostrand Co., 1948, pp 206-207.
