Abstract
The adaptation of various veneer materials to gold was compared by studying the penetration of radioisotopes between the veneers and the cast gold crown. The veneer materials evaluated were silicate, acrylic resin, porcelain cemented with zinc phosphate cement, and 2 baked-on porcelain techniques. By this test, the porcelain materials fused to the gold, particularly when fired in air, appeared to be quite superior to the other materials studied. Even though the adaptation of these materials is reduced when they are fired in vacuum, the rate and degree of infiltration was markedly less than with the acrylic resins, cemented porcelain, or silicate veneers.
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