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Comparative study of three coating agents and their influence on bond strength of porcelain-fused-to-gold alloys

1972; Elsevier BV; Volume: 28; Issue: 5 Linguagem: Inglês

10.1016/0022-3913(72)90062-5

1097-6841

I. Goeller, Jean‐Marc Meyer, J N Nally,

Advanced Sensor and Energy Harvesting Materials

D ental manufacturers have recommended the application of a thin layer of a gold compound to the alloy before firing the porcelain in the gold-ceramic technique. These compounds are known under several names: metal conditioner, bonding agent, and coating agent and, in French, modificateurs de joint (Poggiolil) laques, and dorm-es. Mumford and Ridge2 gave a good description of these coating agents: “Two types of surface coating agents are available. The first is a ceramic material. This material, ceramic in nature and fused to the surface, seals off contaminants and reduces the possibility of bubbles forming at the interface between the porcelain and metal. It has no effect on the covering power of the opaque. The second group of materials is essentially fluxed pastes of powdered gold alloys. When painted on the surface and fused, these materials seal it and change the color to a bright golden hue. The paste may contain small beads of high-fusing alloy which become soldered to the casting.” The main characteristics of the coating agents are known from clinical observations and hypotheses. Vickery and Badinelli3 showed that in laboratory practice, many technicians used them to seal off any surface porosity, to mask the greyish color of the metal, and to provide an underlying “live” hue to the porcelain coverage. The purposes of this study were (1) to describe three coating agents recom-