METHOD FOR MANUFACTURING A DENTAL PROSTHESIS

• Main Authors: ZELLMANN, Gerhard, STEINKE, Rudi, WISSEL, Irmgard, FECHER, Stefan, VÖLKL, Lothar, HACHENBERG, Jörg, HOCK, Elmar, VOLLMANN, Markus
• Format: Patent
• Language: English
• Published: 24.10.2019
• Subjects: ALLOYS; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE; CASTING; CHEMISTRY; DENTISTRY; FERROUS OR NON-FERROUS ALLOYS; HUMAN NECESSITIES; HYGIENE; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MEDICAL OR VETERINARY SCIENCE; METALLURGY; PERFORMING OPERATIONS; POWDER METALLURGY; PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WORKING METALLIC POWDER

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.