Transmission electron microscopic investigation of a Pd-Ag-In-Sn dental alloy.
With the price volatility of palladium, there has been renewed interest in palladium-silver alloys for metal-ceramic restorations in dentistry. The microstructures of a popular Pd-Ag dental alloy were investigated in the as-cast and simulated porcelain-firing heat-treated conditions, using transmission electron microscopy. In the as-cast condition, the microstructure was strongly influenced by microsegregation, and contained the face-centered cubic Pd solid solution matrix, a eutectic structure with lattice parameters that varied for the two phases, and a face-centered tetragonal (fct) precipitate. After heat treatment, the lattice parameters for the two phases in the eutectic structure were uniform, and discontinuous precipitates with [011](matrix) habit planes and dislocations appeared in the matrix. An unusual nanostructured constituent was found in the fct set of eutectic lamellae in the heat-treated alloys.
Guo
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Section of Restorative Dentistry, Prosthodontics and Endodontics, College of Dentistry, The Ohio State University, 305 West 12th Avenue, Mailbox #191, PO Box 182357, Columbus, OH 43218-2357, USA.
Brantley
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Clark
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Monaghan
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Mills
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MJ
D003722:Dental Alloys / Q000737:chemistry*; D003793:Dental Restoration, Permanent; D006358:Hot Temperature; D006801:Humans; D066298:In Vitro Techniques; D007204:Indium / Q000737:chemistry; D008422:Materials Testing; D016876:Metal Ceramic Alloys / Q000737:chemistry*; D008854:Microscopy, Electron; D010165:Palladium / Q000737:chemistry; D012834:Silver / Q000737:chemistry; D013499:Surface Properties; D014001:Tin / Q000737:chemistry
D003722:Dental Alloys; D016876:Metal Ceramic Alloys; D007204:Indium; D012834:Silver; D010165:Palladium; D014001:Tin