Dental alloy and restoration made therewith

A noble metal dental casting alloy for use in making dental restorations comprising:

• (a) 45-55 percent by weight palladium;
• (b) 35-45 percent by weight silver;
• (c) 2-5percent by weight manganese;
• and
• (d) 5-10 percent by weight of at least one modifier element selected from one or both of the groups consisting of:
• (i) gold, platinum, copper, tin, gallium, zinc, indium and cobalt in amounts of up to 10 percent by weight each;
• and
• (ii) the group consisting of ruthenium, rhenium, aluminum, germanium, lithium, silicon, iridium, boron, tantalum and niobium in amounts of up to 5 percent by weight each, said alloy having a solidus temperature of at least 1100.degree. C., a liquidus temperature of not more than 1400.degree. C., tensile elongation of at least 2 percent, thermal expansion coefficient of at least 14.0.times.10.sup.-6 per .degree.C., Vickers hardness of at least 150, and offset yield strength at 0.2 percent of at least 250 MPa;
• and
• (b) a porcelain coating upon a portion of said casting, said coating being firmly bonded to said casting and being substantially free from discoloration.

A dental restoration comprising:

• (a) a casting of a dental alloy consisting essentially of (i) 35-70 percent by weight palladium, (ii) 25-50 percent by weight silver, (iii) 0.5-10 percent by weight manganese, and (iv) 1-30 percent by weight of at least one modifier element selected from one or both of the groups consisting of:
• (A) gold, platinum, copper, tin, gallium, zinc, indium and cobalt in amounts of up to 15 percent by weight each;
• and
• (B) the group consisting of ruthenium, rhenium, aluminum, germanium, lithium, silicon, iridium, boron, tantalum and niobium in amounts of up to 5 percent by weight each,
• said alloy having a solidus temperature of at least 1100.degree. C., a liquidus temperature of not more than 1400.degree. C., tensile elongation of at least 2 percent, thermal expansion coefficient of at least 14.0.times.10.sup.-6 per .degree.C., Vickers hardness of at least 150, and offset yield strength at 0.2 percent of at least 250 MPa.

A dental restoration comprising:

• (a) a casting of a dental alloy consisting essentially of
• (i) 45-55 percent by weight palladium;
• (ii) 35-45 percent by weight silver;
• (iii) 2-5percent by weight manganese, and (iv) 5-10 percent by weight of at least one modifier element selected from one or both of the groups consisting of:
• (A) gold, platinum, copper, tin, gallium, zinc, indium and cobalt in amounts of up to 10 percent by weight each;
• and
• (B) the group consisting of ruthenium, rhenium, aluminum, germanium, lithium, silicon, iridium, boron, tantalum and niobium in amounts of up to 5 percent by weight each, said alloy having a solidus temperature of at least 1100.degree. C., a liquidus temperature of not more than 1400.degree. C., tensile elongation of at least 2 percent, thermal expansion coefficient of at least 14.0.times.10.sup.-6 per .degree.C., Vickers hardness of at least 150, and offset yield strength at 0.2 percent of at least 250 MPa;
• and
• (b) a porcelain coating upon a portion of said casting, said coating being firmly bonded to said casting and being substantially free from discoloration.