Veneerable silver alloy for producing ceramic-veneered dental restorations

Abstract

An alloy that can be fired onto, for producing ceramic-faced dental restorations, comprising or consisting of: Silver 40-45 wt. %, Gold 37.5-45 wt. %, Palladium 0-14.5 wt. %, Indium, zinc, tin, copper, in total 5.5-15 wt. %, lanthanoids, scandium, lanthanum Manganese 0.1-5 wt. %, Tantalum, platinum, iridium, osmium, in total 0.05-5 wt. %, ruthenium, rhodium, rhenium, titanium, niobium, zirconium, tungsten, vanadium Gallium, iron 0-5 wt. %, Other metals, semimetals and 0-1 wt. %, impurities is described, wherein the data relating to percentage by weight are each with respect to the total weight of the alloy.

1 . An alloy that can be fired onto, for producing ceramic-faced dental restorations, comprising or consisting of:  
     
       
         
               
               
               
             
                   
               
                   
               
                 Silver 
                 40-45 
                 wt. %, 
               
                 Gold 
                 37.5-45 
                 wt. %, 
               
                 Palladium 
                 0-14.5 
                 wt. %, 
               
                 Indium, zinc, tin, copper, 
                 in total 5.5-15 
                 wt. %, 
               
                 Lanthanides, scandium, lanthanum 
               
                 Manganese 
                 0.1-5 
                 wt. %, 
               
                 Tantalum, platinum, iridium, osmium 
                 in total 0.05-5 
                 wt. %, 
               
                 ruthenium, rhodium, rhenium, 
               
                 titanium, niobium, zirconium, tungsten, 
               
                 vanadium 
               
                 Gallium, iron 
                 0-5 
                 wt. %, 
               
                 Other metals, semimetals and 
                 0-1 
                 wt. %, 
               
                 impurities 
               
                   
               
                   
               
           
              
              
             
             
              
              
              
              
              
              
              
              
              
              
              
              
              
              
              
             
          
         
       
       wherein the data relating to percentage by weight are each with respect to the total weight of the alloy.  
     
   
   
       2 . An alloy according to  claim 1 , containing:  
     
       
         
               
               
               
               
             
                   
                   
               
                   
                   
               
                   
                 Silver 
                 40.3-43.0 
                 wt. % 
               
                   
                 and/or 
               
                   
                 Gold 
                 38-42 
                 wt. % 
               
                   
                 and/or 
               
                   
                 Palladium 
                 12.5-14.5 
                 wt. %. 
               
                   
                   
               
                   
                   
               
           
              
              
             
             
              
              
              
              
              
              
              
             
          
         
       
     
   
   
       3 . An alloy according to  claim 1 , containing:  
     
       
         
               
               
               
             
                   
                   
               
                   
                   
               
                   
                 Indium, zinc, tin, copper, 
                 in total 5.5-10 wt. %. 
               
                   
                 lanthanides, scandium, lanthanum 
               
                   
                   
               
                   
                   
               
           
              
              
             
             
              
              
              
              
             
          
         
       
     
   
   
       4 . An alloy according to one of  claims 1  to  3 , containing:  
     
       
         
               
               
               
             
                   
                   
               
                   
                   
               
                   
                 Indium 
                 5.5-10 wt. % 
               
                   
                   
               
                   
                   
               
           
              
              
             
             
              
              
              
             
          
         
       
     
   
   
       5 . An alloy according to one of  claims 1  to  3 , containing:  
     
       
         
               
               
               
             
                   
                   
               
                   
                   
               
                   
                 Manganese 
                 0.1-1 wt. %. 
               
                   
                   
               
                   
                   
               
           
              
              
             
             
              
              
              
             
          
         
       
     
   
   
       6 . An alloy according to one of claims  2  or  3 , containing:  
     
       
         
               
               
             
                   
               
                   
               
                 Tantalum, platinum, iridium, osmium, 
                 in total 0.05-0.2 wt. %. 
               
                 ruthenium, rhodium, rhenium, titanium, 
               
                 niobium, zirconium, tungsten, vanadium 
               
                   
               
                   
               
           
              
              
             
             
              
              
              
              
              
             
          
         
       
     
   
   
       7 . An alloy according to one of claims  2  or  3 , containing:  
     
       
         
               
               
               
             
                   
                   
               
                   
                   
               
                   
                 Tantalum 
                 0.05-0.2 wt. %. 
               
                   
                   
               
                   
                   
               
           
              
              
             
             
              
              
              
             
          
         
       
     
   
   
       8 . A ceramic-faced dental restoration, comprising: 
 a dental structure made of an alloy according to one of claims  1 - 3 ; and    a dental ceramic with a CTE in the range 15-17 [10 −6 K −1 ] fired onto the dental structure.    
   
   
       9 . An alloy comprising: 
 between 38.5 and 42.5 wt. % silver;    between 36.6 and 39.6 wt. % gold;    between 0 and 14.5 wt. % palladium;    between 5.5 and 15 wt. % indium;    between 0.1 and 5 wt. % manganese; and    between 0.05 and 5 wt. % total of one or more of tantalum, platinum, iridium, osmium, ruthenium, rhodium, rhenium, titanium, niobium, zirconium, tungsten or vanadium.    
   
   
       10 . An alloy according to  claim 9  containing 0.05% to 0.2 wt. % tantalum.  
   
   
       11 . An alloy according to  claim 9  containing 12 to 14 wt. % palladium.  
   
   
       12 . An alloy according to  claim 9  containing 7 to 9 wt. % indium.