Abstract
Three base materials, Dycal, Hydrex, and Cavitec, were tested for resistance to intrusion into the pulp under simulated clinical conditions, including 37 °C. and 100 per cent relative humidity. These base materials resisted pulpal intrusion at their Gilmore initial set time when placed 1 mm. thick over an exposure of 2 mm. and subjected to 583 p.s.i. condensation pressure (3 pounds of force on a 2 mm. condenser). The initial set time for Hydrex is sensitive to variations in humidity. This material required more than twice as long (4½to5½ minutes) to set in the oral environment, when a rubber dam was used. Dycal and Cavitec were not as sensitive to variations in humidity.
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