METHOD FOR MANUFACTURING A DENTAL PROSTHESIS

• US 20190321147A1
• Filed: 06/26/2019
• Published: 10/24/2019
• Est. Priority Date: 11/09/2010
• Status: Active Application

• Current Assignee: Degudent GmbH
• Original Assignee: Degudent GmbH
• Inventors: HACHENBERG, Jorg, STEINKE, Rudi, VOLLMANN, Markus, WISSEL, Irmgard, ZELLMANN, Gerhard, HOCK, Elmar, FECHER, Stefan, VOLKL, Lothar
• Application Number:
  US16/452,809
• Publication Number:
  US 20190321147A1
• Time in Patent Office: Days
• CPC Class Codes: A61C 13/0022 Blanks or green, unfinished dental restoration parts
• CPC Class Codes: A61K 6/84 comprising metals or alloys
• CPC Class Codes: B22F 2003/247 Removing material: carving, cleaning, grinding, hobbing, honing, lapping, polishing, milling, shaving, skiving, turning the surface
• CPC Class Codes: B22F 2003/248 Thermal after-treatment
• CPC Class Codes: B22F 2301/15 Nickel or cobalt
• CPC Class Codes: B22F 3/02 Compacting only
• CPC Class Codes: B22F 3/1021 Removal of binder or filler removal of binder from ceramics C04B35/638
• CPC Class Codes: B22F 3/11 Making porous workpieces or articles
• CPC Class Codes: B22F 3/16 in successive or repeated steps
• CPC Class Codes: B22F 3/24 After-treatment of workpieces or articles B22F3/1146 takes precedence
• CPC Class Codes: C22C 19/05 with chromium
• CPC Class Codes: C22C 19/053 with the maximum Cr content being at least 30% but less than 40%
• CPC Class Codes: C22C 19/055 with the maximum Cr content being at least 20% but less than 30%
• CPC Class Codes: C22C 19/07 based on cobalt

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 T_VS at a heat-up rate R_HVS, cooling the green compact from the presinter end temperature T_VS at a cool-down rate R_KVS, whereby at least the heat-up rate R_HVS, the presinter end temperature T_VS, and the cool-down rate R_KVS 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.

Claims

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.