[Fundamental studies of precious alloys for porcelain fusing. (2) Deformation of Au-Pt-Pd ternary alloys on porcelain firing (author's transl)]. 1976

O Miyata

In order to compare the deformation of the castings in the firing process with the results of the previous paper, 1/10-tapered ring type thimble crowns were prepared using nine Au-Pt-Pd ternary alloys of the same composition as in the previous paper. The deformation in the firing process was determined by the shoulder gap change measurement. Conclusions are summarized as follows. 1) The correlation between the thermal expansion hysteresis H and the shoulder gap change K is highly significant (r= 0.96, phie=7),and it can be represented by the following equation: K(mm)=0.15 + 1.22 H(%) 2) The gap change increases with increase of Pt content. 3) Most of the deformation occurs in degassing treatment, while in the other firing process the deformation scarcely occurs.

UI MeSH Term Description Entries
D010165 Palladium A chemical element having an atomic weight of 106.4, atomic number of 46, and the symbol Pd. It is a white, ductile metal resembling platinum, and following it in abundance and importance of applications. It is used in dentistry in the form of gold, silver, and copper alloys.
D010984 Platinum A heavy, soft, whitish metal, resembling tin, with atomic number 78, atomic weight 195.084, symbol Pt. It is used in manufacturing equipment for laboratory and industrial use. It occurs as a black powder (platinum black) and as a spongy substance (spongy platinum) and may have been known in Pliny's time as "alutiae". Platinum Black
D003722 Dental Alloys A mixture of metallic elements or compounds with other metallic or metalloid elements in varying proportions for use in restorative or prosthetic dentistry. Alloy, Dental,Alloys, Dental,Dental Alloy
D003776 Dental Porcelain A type of porcelain used in dental restorations, either jacket crowns or inlays, artificial teeth, or metal-ceramic crowns. It is essentially a mixture of particles of feldspar and quartz, the feldspar melting first and providing a glass matrix for the quartz. Dental porcelain is produced by mixing ceramic powder (a mixture of quartz, kaolin, pigments, opacifiers, a suitable flux, and other substances) with distilled water. (From Jablonski's Dictionary of Dentistry, 1992) Porcelain,Porcelain, Dental,Dental Porcelains,Porcelains,Porcelains, Dental
D012834 Silver An element with the atomic symbol Ag, atomic number 47, and atomic weight 107.87. It is a soft metal that is used medically in surgical instruments, dental prostheses, and alloys. Long-continued use of silver salts can lead to a form of poisoning known as ARGYRIA.
D013816 Thermodynamics A rigorously mathematical analysis of energy relationships (heat, work, temperature, and equilibrium). It describes systems whose states are determined by thermal parameters, such as temperature, in addition to mechanical and electromagnetic parameters. (From Hawley's Condensed Chemical Dictionary, 12th ed) Thermodynamic

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