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Precious Alloy Crown, Bridge

Precious metal alloys (or high noble alloys) are alloys that are predominantly comprising high noble metals such as gold, platinum, iridium, osmium, palladium, ruthenium, rhodium and silver. High Noble Alloys strictly maintain more than 40 wt% of gold (Au) and more than 60 wt% of noble metals in general. The majority of precious metal alloys in dentistry are used for indirect restorations such as inlays, onlays, crowns and bridges.

‘Full metal’ prosthetics is a common dental term describing restorations that are done without veneering porcelain for ceramic bonding. A ‘full gold’ crown implies a full metal crown with a high content of gold. Full gold restorations have been used in dentistry for a very long time, taking advantage of the excellent properties of alloys, and in turn have become the standard by which most other restorative systems are judged.

High noble alloys can be divided into three groups

  • Au-Pt: commonly used for both, full metal and ceramo-metal applications
  • Au-Pd: widely used as a high noble dental casting alloy for ceramo-metal restorations
  • Au-Ag-Cu: not typically used for ceramo-metal bonding as the temperature of the solidus is too low for porcelain fusion. Therefore, these alloys have been used since many years for full metal applications

Mechanical Properties

Alloy Type Young’s Modulus
Vicker’s Hardness
Yield Strength


  • Superior Strength: Due to their 100% metal construction, there's no type of crown that's stronger than an all-metal one.Failure of the restoration due to breaking is an extremely rare occurrence
  • Great longevity: Due to its single-component construction alongwith the great strength and durability characteristics it possesses, no other type of dental restoration providesa more lasting service than an all-metal one
  • They offer good biocompatibility and cause minimal wear to opposing teeth
  • Allergies due to high noble alloys are rare
  • Because of being very pliant and workable, high noble alloys provide a superior fit

All metal restorations are minimally used for aesthetic reasons.

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