Plastic and nonmetallic article shaping or treating: processes – Dental shaping type
Patent
1998-03-23
2000-05-23
Fiorilla, Christopher A.
Plastic and nonmetallic article shaping or treating: processes
Dental shaping type
264219, 264225, 425 78, 425175, 425547, A61C 1300, B22F 300
Patent
active
060662743
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates, to among other things, a process for producing a sinterable ceramic or metallic body, which can also have an individual and distinctive shape and, for example, consists of a dental bridge shell. The production is executed using a tool/molding tool which can be assembled from two or more tool parts and whose molding space corresponds to the shape of the body. The invention also relates to a device or tool for producing the sinterable ceramic or metallic product or ceramic prosthesis (metallic prosthesis). Furthermore, the invention relates to a process for producing a shell for a metallic or ceramic product or a ceramic prosthesis (metallic prosthesis) which is designed to be anchorable to a base which has been prepared in the human body and, for example, includes or consists of an implant, tooth remnant(s), etc. In the process, use is made of a tool having a molding space for the shell and of first and second models of the base and the shell, respectively. The invention also relates to an injection molding tool for the product or prosthesis. The invention also relates to a process for producing an injection molding composition, which comprises a polymer melt and/or wax, melt (binding agent) and powder particles mixed into this melt. The composition is intended to be squeezed or pressed, in the melted state, into one or more spaces in an injection molding tool to achieve a sinterable body which is formed when the composition is in solidified form and which preferably has an individual and/or complex shape. In addition, the invention relates to a powder for an injection molding composition which, in the melted state, can be squeezed or injected under low or medium pressure, by which in this case is meant 1-200 bar, into one or more molding spaces in an injection molding tool for the purpose of forming a sinterable solidified body which preferably has an individual and/or complex shape. Finally, the invention relates to an injection molding composition for forming, in a tool, a sinterable body which preferably has an individual and/or complex shape. The composition comprises a sinterable powder which has been treated with a hydrophobic agent and can be mixed into a melt of binding agent, for example paraffin wax and/or polyethylene. The invention can also be used for making products in metal/hard metal, with use being made of metal powder, for example titanium powder, which is molded and sintered to the desired density.
BACKGROUND OF THE INVENTION
The production of ceramic products or ceramic prostheses is very well known. Thus, for example, it is known to make use of die casting employing a tool which has a porous tool part through whose pores solvent, which has been released, is conducted away during the casting process. When producing dental bridges, for example, it is already known to use models of jawbone impressions and dental bridge shapes for producing dental bridge shells, which are to be coated with additional material for aesthetic shaping. It is also known to produce tools and tool parts to which the shape of the product or prosthesis can be transferred using a copying technique, after which the tool or tool part is used for spark machining a workpiece to form the product or prosthesis.
It is also well known to produce different types of wet compositions containing solvents and plaster and to use these in connection with making ceramic products in the form of coffee pots, lavatory seats, exhaust ports for internal combustion engines, etc. In this context, it is known to propose injection molding compositions which include ceramic powder or metallic or alloy powder which can be mixed into the melt of binding agent in the form of wax, polymers, etc. In connection with this, well-known technology proposes the use of dry crushing processes, dispersing agents, etc.
The body/product/prosthesis which is referred to above and which is produced using the present invention must be sinterable. The sintering confers the desired hardness on the body during the
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Antonson Izidor
Brandt Jesper
Pompe Robert
Fiorilla Christopher A.
Nobel Biocare AB
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