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A mixture, either in solution or compound, of two or more metals. Gold, palladium, titanium, nickel-chrome, and nickel metal–ceramic alloys may be used in the construction of bridges and crown restorations. Copper is added to gold to reduce the density and melting point and increase the strength and hardness; however, the corrosion resistance is reduced. The addition of silver to gold increases the hardness and strength but also increases porosity and the degree of tarnish. Zinc or indium are added as scavengers to prevent the oxidation of other metals during melting and casting. A eutectic alloy has a melting point which is lower than that of any of the individual metals of which it is constituted. See also amalgam.

Further Reading:

Brown D. Alloys for metal-ceramic restorations. Dent Update 2005;32:583–6.

Subjects: Dentistry.

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