Method for manufacturing a dental prosthesis

Abstract

A method for manufacturing a shaped body, comprising creating a mixture of a metal powder and binding agent, compacting the mixture to form a green compact, heating the green compact to a debinding start temperature T1, debinding the green compact by controlled heating of the green compact from start temperature T1 to end temperature T2 at a heat-up rate R1, presintering the debindered green compact to the presinter end temperature TVS at a heat-up rate RHVS, cooling the green compact from the presinter end temperature TVS at a cool-down rate RKVS, whereby at least the heat-up rate RHVS, the presinter end temperature TVS, and the cool-down rate RKVS are tuned relative to each other in such a way that the presintered green compact forming a blank has a surface porosity of 16% to 22% after presintering, and machining and sintering of the blank to form the shaped body.

What is claimed is: 
     
         1 . A method of manufacturing a dental prosthesis, or a part thereof, the method comprising:
 preparing a green compact from a cobalt-chromium alloy consisting of:
 cobalt: 50 to 70% by weight; 
 chromium: 20 to 35% by weight; 
 molybdenum: 0 to 10% by weight; 
 tungsten: 0 to 20% by weight; 
 other elements: less than 10% by weight; 
   wherein a sum total of the elements adds up to 100% by weight;   heating the green compact;   debinding the heated green compact;   presintering the debindered green compact to form a blank having a surface porosity of from 16% to 22%;   processing the blank; and   sintering the processed blank to a final density to form the dental prosthesis, or the part thereof.   
     
     
         2 . The method according to  claim 1 , wherein the blank is processed by machining. 
     
     
         3 . The method according to  claim 1 , wherein the blank is processed using computer-aided manufacturing technology.