Method for the preparation of dental prosthetic artefacts by means of powder sintering

Abstract

The present invention relates to a method for obtaining dental prosthetic artefacts, corrections, additions, welds and the like, which method uses the sintering of powders of metal alloys in common dentistry furnaces and comprises the following phases: adapting a plate of metallic powder with organic compounds added, modelling said adapted plate, coating the prepared item with refractory coating material mixed with an organic liquid and sintering the prepared item. The present invention further presents the advantage of enabling to work directly on the master model, avoiding the duplication step with the consequent time saving and with greater precision.

1 . A method for obtaining dental prosthetic structures and the like, characterised in that it comprises the following steps: 
 adapting a plate made of metal powder with organic compounds added to a model made of plaster or the like;    modelling said plate adapted on said model made of plaster or the like;    coating the prepared item with refractory coating material and mixed with an organic liquid; and    sintering the prepared item.    
     
     
         2 . A method according to  claim 1 , wherein said metallic powder is a powder of pure metal.  
     
     
         3 . A method according to  claim 1 , wherein said metallic powder is a powder of metallic alloys.  
     
     
         4 . A method according to  claim 1 , characterised in that said plate is obtained by mixing different metallic powders.  
     
     
         5 . A method according to  claim 1 , characterised in that said plate is obtained by mixing at least two metallic powders of pure metal.  
     
     
         6 . A method according to  claim 1 , characterised in that said plate is obtained by mixing at least two metallic powders of pure metal and metal alloy.  
     
     
         7 . A method according to  claim 1 , characterised in that said plate is obtained by mixing at least two metallic powders of metal alloy.  
     
     
         8 . A Method according to any of the previous claims from  1  to  7 , wherein said mixing of metallic powders has a volumetric ratio between the components that ranges between 0.5 and 1.5.  
     
     
         9 . A method according to in the previous claim, wherein said volumetric ratio is equal to 1.  
     
     
         10 . A method according to any of the previous claims, characterised in that said organic liquid contains a substance comprising from 1 to 10 carbon atoms.  
     
     
         11 . A method according to the previous claim, characterised in that the organic liquid is selected from the following compounds: ethyl alcohol, acetone, methyl alcohol, propyl alcohol, ethyl-methyl-ketone, diethyl-ketone, acrylic acid, metacrylic acid, diethanolamine, diethylamine, and the like, and mixtures of two or more of said substances.  
     
     
         12 . A method according to one or more of the previous claims, characterised in that any excess organic liquid is eliminated by means of permanence in the furnace at a temperature lower than sintering temperature.  
     
     
         13 . A method according to one or more of the previous claims, characterised in that said metallic powder is constituted by an alloy containing at least 50% of Pd.  
     
     
         14 . A method according to one or more of the previous claims  1  through  12 , characterised in that the metallic powder is constituted by an alloy containing at least 50% of Au.  
     
     
         15 . A method according to one or more of the previous claims  1  through  12 , characterised in that the metallic powder is constituted by an alloy containing at least 50% of Ag.  
     
     
         16 . A method according to one or more of the previous claims  1  through  12 , characterised in that the metallic powder is constituted by pure gold.  
     
     
         17 . A method according to one or more of the previous claims  1  through  12 , characterised in that the metallic powder is constituted by pure silver.  
     
     
         18 . A method according to one or more of the previous claims, characterised in that said additive for said metallic powder is an organic compound selected from the following compounds: 
 Polyethylene glycol, glycerine, butylic rubber, isobutylic rubber, natural rubber, natural wax, synthetic wax, and the like and mixtures of two or more of said substances.    
     
     
         19 . A method according to one or more of the previous claims, characterised in that the dimensions of the particles of the powders used normally range between 0.1 and 1000 μm.