DEVELOPMENT OF DENTAL GOLD ALLOYS WITH AGE-HARDENABILITY AT INTRAORAL TEMPERATURE

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Dental gold alloys with age-hardenability at intraoral temperature were developed. Either 3 or 6 at% Ga,Al,Zn,In,Ni or Pd were added to the equiatomic AuCu alloy and the effect of additives on the low temperature age-hardenability was examined. Alloys containing Ga,Al or Zn exhibited excellent low temperature age-hardenability. The hardness of an alloy containing 6 at% Ga or 6 at% Al was doubled in one to ten days by aging at 37ﾟC. On the other hand,addition of Ni or Pd decreased the low temperature age-hardenability. Pronounced hardening was not demonstrated in an as-cast alloy,but solution treatment for only a few minutes provided enough age-hardenability. Age-hardening rate at low temperature related closely with the melting temperature of the alloy.It is concluded that Ga,Al or Zn added AuCu alloy is expected to have enough age-hardenability for clinical use in the oral environment.