Dentistry silver

Dentistry. Silver is also used in dentistry either as Ag-Sn-Hg or Ag-Sn-Cu-Hg silver alloys owing to their small expansion during setting, which is suitable for making dental amalgams. 

Dentistry. Most casting alloys meet the composition and properties criteria of specification no. 5 of the American Dental Association (37) which prescribes four types of alloy systems constituted of gold—silver—copper with addition of platinum, palladium, and 2inc. Composition ranges are specified, as are mechanical properties and minimum fusion temperatures. Wrought alloys for plates also may include the same constituents. Similarly, specification no. 7 prescribes nickel and two types of alloys for dental wires with the same alloy constituents (see Dental materials). 

Gold Casting and Wrought Alloys. Gold alloys useful ki dentistry may contaki gold, silver, platinum, palladium, iridium, kidium, copper, nickel, tin, kon, and zkic. Other metals occasionally are found ki minor amounts. The effect of each of the constituents is empirical, but some observations have been made. 

Solders. Modem dental solders are made from mostly corrosion-resistant, nontoxic metals. Minimal quantities of tin and other elements are often added, some of which could produce toxic effects in the unalloyed state. Each solder is used for specific appHcations (180—188) typical compositions and properties of solders used in dentistry are presented in Table 11. Most of the ingredients of solders are resistant to corrosion, and alloying them with other ingredients renders the alloy safe for use in appHances placed in the oral environment. Silver solders corrode, but are used only for temporary appHances. Available products do not contain cadmium, although cadmium was an ingredient of some silver solders up to ca 1980. 

There have been numerous reports of possible allergic reactions to mercury and mercury salts and to the mercury, silver and copper in dental amalgam as well as to amalgam corrosion products Studies of the release of mercury by amalgams into distilled water, saline and artificial saliva tend to be conflicting and contradictory but, overall, the data indicate that mercury release drops with time due to film formation and is less than the acceptable daily intake for mercury in food . Further, while metallic mercury can sensitise, sensitisation of patients to mercury by dental amalgam appears to be a rare occurrence. Nevertheless, there is a growing trend to develop polymer-based posterior restorative materials in order to eliminate the use of mercury in dentistry. 

Robbins, J. W. Cooley, R. L. (1988). Microleakage of Ketac-Silver in the tunnel preparation. Operative Dentistry, 13, 8-11. 

Swift, E. J. (1988a). Silver-glass ionomers. A status report for the American Journal of Dentistry. American Journal of Dentistry, 1, 81-3. 

Compounds of silver are used in photography, to coat mirrors, and in dentistry and medicine. Newborn babies eyes are protected from infection by drops of a solution containing a compound of silver, and the same compound is used to treat burns. In pure air, silver would never tarnish. Trace elements in the air cause silver to turn black. Coins like the U.S. 10 cent piece were formerly made of silver, with copper added to make them harder. 

Certain other metallic astringents e.g. ferric chloride solution, lead acetate, silver nitrate, mercuric chloride etc. are used as astringents in dentistry. 

Gold is also used in dentistry. This application has declined in recent years however, it still accounts for about 7% of gold consumption. Gold alloys, such as gold-silver-copper with varying amounts of platinum and... 

Amalgams. Liquid mercury is a fairly good solvent for all metals except iron and platinum. The alloys that are formed by dissolving metals in mercury are called amalgams, many of which involve inter-metallic compounds of the type MHg, where x is quite variable. Aside from their many applications in scientific work, amalgams are used in dentistry and in connection with the metallurgy of silver and gold. 

The alloys of mercury are called amalgams. Amalgams of silver, gold, and tin are used in dentistry. Mercury does not wet iron, and it is usually shipped and stored in iron bottles, called flasks, which hold 76 lbs. of the metal. 

Gotjamanos T. Safety issues related to the use of silver fluoride in paediatric dentistry. Aust Dent J... 

In dentistry, as alloys with silver, copper, palladium, platinum, and zinc to make crowns, bridges, etc. 

Silver and silver alloys are used for electrical contacts, connecting leads in semiconductor devices, solders and brazes, corrosion-resistant structural parts, batteries, oxidation catalysts, optical and heat reflecting mirrors, table ware, jewellery, dentistry, and coins. Silver halides are base components in photographic emulsions. 

Silver. Silver is ductile and very malleable, conducts heat, and has the highest electrical conductivity of all metals. It is used to make cutlery, jewelry, coins, long-life batteries, photographical films, and electronic components (circuits, contacts), and in dentistry. Its alloy, sterling silver (silver plus copper) is also used to make jewelry and tableware. German silver (sdver plus nickel) is another alloy used for sU-verware. 

The alloys of silver and gold, usually containing some copper, are used in jewelry, in dentistry, and as a gold solder. 

The tendency of mercury to form amalgams has been utilized in dentistry. An amalgam for dental fillings may be composed of 52% mercury, 35% silver and 13% tin. It is prepared by stirring a silver-tin alloy into mercury. The mixture is vibrated to a plastic mass, which is placed in the bored tooth and compressed. 

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