Noble Metal Alloys For Metal Ceramic Restorations

Reducing the alloy thickness of base metal ceramic restorations.

Noble metal alloys for metal ceramic restorations.

Several alternatives to cast metals are considered. A durable alternative to palladium alloys auribond gp is a high strength high noble metal premium ceramic alloy. Some cast restorations such as inlays onlays some crowns and bridges are composed solely of metal figure 21 3. Casting alloys for tooth restorations.

A review of the comparative characteristics and properties of noble metal alloys used for metal ceramic restorations has been presented. Gold platinum palladium alloys were the first alloys used in metal ceramic restorations. The density is midway between that of base metal of high noble alloys. Metal ceramic and all ceramic restorations.

The vast majority of these restorations are constructed out of noble alloys but in certain situations the clinician may prescribe the use of a base metal alloy. The price of pd alloy is 1 3 that of a gold alloy. The biggest advantage of the ceramic restoration is its permanent aesthetic quality. As examples the metal component of a porcelain fused to metal crown for a lower incisor or upper lateral incisor might be relatively minimal.

They were largely discontinued due to the introduction of cheaper alloys with improved mechanical properties and greater flexural strength. Noble alloys for metal ceramic restorations palladium based alloys. The thickness to which base metal alloys may be reduced in comparison to noble metal alloys for metal ceramic. The requirements of a metal ceramic dental restoration consisting of a rigid substrate which supports an aesthetic veneer are assessed.

Selection of an alloy for one s practice should be based on long term clinical data physical properties esthetic potential and laboratory data on metal ceramic bond strength and thermal compatibility with commercial dental porcelains. The contemporary cast bonding alloys that have good track records as substrates are categorized and their properties are compared. However the success rate after seven and a half years refers only to noble metal alloys with a gold content of at least 40 as well as castings with conventional metal margins. Noble pd based alloys offer a compromise between the high noble gold alloys and base metal alloys.

Gold is the most abundant metal within the alloy 88 whereas concentrations of platinum and palladium are variable. With restorations where the actual amount weight of metal they contain is relatively small the price difference between using a high noble or base metal alloy might be very minor. Polishing characteristics are superior to most other high gold content ceramic alloys.