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 transmiss...

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Bibliographic Details
Published in:Biomaterials 2003-05, Vol.24 (10), p.1705-1712
Main Authors: Guo, W.H, Brantley, W.A, Clark, W.A.T, Monaghan, P, Mills, M.J
Format: Article
Language:English
Subjects:
Dental Alloys - chemistry
Dental Restoration, Permanent
Discontinuous precipitation
Eutectic
Hot Temperature
Humans
In Vitro Techniques
Indium - chemistry
Materials Testing
Metal Ceramic Alloys - chemistry
Microscopy, Electron
Microstructure
Palladium - chemistry
Pd–Ag dental alloy
Silver - chemistry
Surface Properties
Tin - chemistry
Transmission electron microscopy
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Summary: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 {0 1 1} 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.
ISSN:0142-9612
1878-5905
DOI:10.1016/S0142-9612(02)00564-1