Porcelain adherence to high-palladium alloys.
The adherence of porcelain to four representative high-palladium alloys of the first generation (Pd-Cu-Ga) and second generation (Pd-Ga) was measured by use of a gold-palladium alloy as a control. The area fraction of adherent porcelain after metal-ceramic specimens were debonded in biaxial flexure at constant strain was calculated from the characteristic Si x-ray intensity with a standardized scanning electron microscope/energy-dispersive spectroscopy technique (SEM/EDS). The gold-palladium alloy exhibited the highest percentage of cohesive fracture through the porcelain, the two first-generation alloys were intermediate, and the two second-generation alloys exhibited the lowest area fractions. This study demonstrated that conventional visual (naked eye) or microscopic examination of the fractured metal-ceramic specimens at moderate magnification and the use of standard quantitative metallographic techniques were inadequate to provide accurate measurements of the area fraction covered with porcelain.
Papazoglou
E
E
Section of Restorative and Prosthetic Dentistry, College of Dentistry, Ohio State University, Columbus.
Brantley
W A
WA
Carr
A B
AB
Johnston
W M
WM
D000704:Analysis of Variance; D003300:Copper; D001840:Dental Bonding; D003776:Dental Porcelain / Q000737:chemistry*; D003799:Dental Stress Analysis; D004577:Electron Probe Microanalysis; D005708:Gallium; D006047:Gold Alloys; D006801:Humans; D008422:Materials Testing; D016876:Metal Ceramic Alloys / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D010087:Oxides; D010165:Palladium / Q000737:chemistry*; D013499:Surface Properties
D006047:Gold Alloys; D016876:Metal Ceramic Alloys; D010087:Oxides; D003776:Dental Porcelain; D010165:Palladium; D003300:Copper; D005708:Gallium