Properties Of Metal Ceramic Alloys

Gold is the most abundant metal within the alloy 88 whereas concentrations of platinum and palladium are variable.

Properties of metal ceramic alloys. Their compositions properties advantages and disadvantages are presented and compared. Other physical properties of ceramics are. They have variable properties and care must be taken in the selection as some are quite ductile and are unsuitable for use in load bearing areas of the mouth. Generally the metallic elements used are nickel molybdenum and cobalt.

A cermet is ideally designed to have the optimal properties of both a ceramic such as high temperature resistance and hardness and those of a metal such as the ability to undergo plastic deformation. Silver alloys have a major disadvantage in that they tarnish and corrode. They were largely discontinued due to the introduction of cheaper alloys with improved mechanical properties and greater flexural strength. The purpose of this article is to review basic information about the alloys used for fabricating metal ceramic restorations in dentistry.

Generally physical properties are identified by simple methods such as odour colour and physical form of the material solid liquid gas. Gold platinum palladium alloys were the first alloys used in metal ceramic restorations. Porosity also we refer pore size these are very important parameters for the ceramic material. The metal is used as a binder for an oxide boride or carbide.

Commercial metal alloys attempt to combine these beneficial properties in order to create metals more useful for particular applications than any of their component elements. Colorcolor noble metal contentnoble metal content hardnesshardness yield strengthyield strength elongationelongation fusion temperaturefusion temperature 125. Their compositions properties advantages and. Base metal alloys tend to have larger grain sizes and do not include grain refiners.

124 selection of metal ceramic alloysselection of metal ceramic alloys physical properties includes physical properties includes. Sag and creep test the specimens were designed to reflect dimensional changes that may occur after each porcelain firing cycle and would in clude any mismatch between porce lain and metal that might occur. Individual pure metals may possess useful properties such as good electrical conductivity high strength and hardness or heat and corrosion resistance. Depending on the physical structure of the material cermets can also be metal matrix.

The purpose of this article is to review basic information about the alloys used for fabricating metal ceramic restorations in dentistry.