SEM and energy dispersive X-ray surface analysis of the interfacial region of selected porcelain-metal systems.
Comparative bond strength data of Ceramco and Vita opaque and body porcelains when fired to high noble, medium noble, and base metal porcelain-fused-to-metal alloys were recently published. In the present study SEM and energy dispersive X-ray (EDX) microanalyses were undertaken--using the same specimens after debonding--to relate the bond strengths reported for 12 different porcelain-metal composites to morphology and chemistry at fracture sites. SEM examination revealed intimate contact between the different porcelains and the metal oxide substrates. On Olympia, a medium noble alloy, bubbles trapped in porcelain at or near fracture sites appeared to decrease the potential interaction. Area scan semiquantitative EDX analysis of the interfacial fracture sites detected high concentrations of metal oxides thought to be essential for a successful chemical bond. Multi-spot surface spectroscopy on similar traces of porcelain residuals revealed significant differences in the amount of particular back scattering activity. Further examination with cross sectional quantitative EDX analysis is suggested for a more precise characterization of element concentration within all components of the porcelain-metal interface.
Lehner
C R
CR
Division of Fixed Prosthodontics, School of Dentistry, University of Minnesota.
Holtan
J R
JR
D003722:Dental Alloys / Q000737:chemistry*; D001840:Dental Bonding; D003776:Dental Porcelain / Q000737:chemistry*; D004577:Electron Probe Microanalysis; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D013499:Surface Properties
D003722:Dental Alloys; D003776:Dental Porcelain