Abstract
Four types of permanent cements were used to determine whether the laboratory tests of compressive and tensile strength were predictive of their retentive abilities when retaining cast gold crowns to natural teeth. The standard laboratory test for film thickness also was compared to the degree of nonseating of these cast restorations. The laboratory tests of compressive and tensile strength are not predictive of retentive ability when considering cements which have differing potentials for reacting with or on the tooth surface. The calculated film thicknesses on the axial walls of the cemented restorations in this study were of the same order of magnitude as those values in the laboratory tests. However, the degree and variance of nonseating of the clinical crowns were considerably greater.
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