Dental alloy and use therefore

Abstract

The invention relates to a dental alloy consisting of 20 to 35% chromium, 0 to 10% molybdenum, 0 to 3% manganese, 0.5 to 2% tin, 2 to 10% gallium, 2 to 8% indium, 0 to 8% silicon, 1.5 to 15% tungsten, 0.1 to 2% aluminum, cobalt as remainder, and impurities, and to the use of the dental alloy for the machining production of dental superstructures, in particular crowns, bridges and combined dental prostheses.

1 . A dental alloy comprising:
 20 to 35% chrome,   0 to 10% molybdenum,   0 to 3% manganese,   0.5 to 2% tin,   2 to 10% gallium,   2 to 8% indium,   0 to 8% silicon,   1.5 to 15% tungsten,   0.1 to 2% aluminum, and   the balance cobalt as well as impurities.   
   
   
       2 . The dental alloy according to  claim 1 , characterized by a proportion of 3 to 8% molybdenum. 
   
   
       3 . The dental alloy according to  claim 1 , characterized by a proportion of 0.1 to 1% manganese. 
   
   
       4 . The dental alloy according to  claim 1 , characterized by a proportion of 0.2 to 4% silicon. 
   
   
       5 . The dental alloy according to  claim 1 , characterized by a proportion of 2.5 to 10% tungsten. 
   
   
       6 . The dental alloy according to  claim 1 , characterized by a proportion of 5 to 8% gallium. 
   
   
       7 . The dental alloy according to  claim 1 , additionally containing at least one element selected from tantalum, niobium, cerium, yttrium and zirconium with a total proportion of 0.1 to 3%. 
   
   
       8 . The dental alloy according to  claim 1 , wherein the alloy has a thermal coefficient of expansion of 13.9×10 −6  to 15.0×10 −6  (at 500° C.). 
   
   
       9 . A method for manufacture of dental superstructures comprising:
 forming a blank of an alloy comprising:
 20 to 35% chrome, 
 0 to 10% molybdenum, 
 0 to 3% manganese, 
 0.5 to 2% tin, 
 2 to 10% gallium, 
 2 to 8% indium, 
 0 to 8% silicon, 
 1.5 to 15% tungsten, 
 0.1 to 2% aluminum, and 
 the balance cobalt as well as impurities, 
   determining the shape of a dental receiving surface upon which the dental superstructure is to be seated, and   machining the blank to form a surface complementary to the dental receiving surface upon which the superstructure is to be seated.   
   
   
       10 . The method as in  claim 10 , wherein said machining is NC/CNC machining. 
   
   
       11 . The method as in  claim 10 , wherein said superstructure is a crown, bridge or combined tooth replacement.