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J Dent Res 45(1): 32-36, 1966
© 1966 International and American Associations for Dental Research
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Variables Affecting the Strength of Bond between Porcelain and Gold

MYER H. LAVINE 1 and FREDERIC CUSTER 1

1 Department of Dental Materials, Temple University School of Dentistry, Philadelphia, Pennsylvania

For good results with porcelain fused to gold, the technician must be thoroughly familiar with the materials, maintain a strict discipline in manipulating the materials, and follow the manufacturer's directions in detail.

Design of the tooth preparation and the metal restoration or framework are factors that probably influence the success of the porcelain-fused-to-gold restoration more than do the actual materials used.

By subjecting the gold-porcelain samples to a transverse test, the porcelain actually was placed under a state of tension, allowing measurement of bond strength.

Roughening the castings before the addition of opaque and gingival porcelain resulted in 13 to 15 per cent greater bond strength as compared with nonroughened castings.

The bonding agent fired at 1,800° F. had 6 to 10 per cent greater bond strength than the castings without the agent. When the metal conditioner was fired to 1,925° F., a 25 per cent increase in load was necessary to fracture the bond.

This work demonstrated that the most important factor affecting the strength of bond between porcelain and gold was high-temperature firing of the metal conditioner. Surface roughness and oxidation were lesser factors. Additional vacuum-firing trials are needed to prove an influence on bond strength due to vacuum firing.

Submitted on July 24, 1963




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