DE202010009686U1 - Milling blank for the production of tooth parts made of sinterable material on CAD / CAM machines - Google Patents

Abstract

Milling blank (1) for producing toothed parts made of sinterable material on CAD / CAM machines, characterized in that the milling blank (1) consists of a matrix of plastic, the filling areas (3) for the material to be milled, the shape of the milled tooth parts is adjusted.

Description

The The invention relates to the construction of a milling blank for the production of Teeth made of sinterable Material on CAD / CAM machines. Under sinterable material in the sense of Invention becomes material from predominantly Metal powder or green ceramic material Understood.

State of the art

The Production of ceramic tooth parts by milling from blocks is well known. in this connection is ceramic powder, such as zirconia, by pressing and with Help of binders shaped into blocks, which are milled on CAD / CAM machines to tooth parts, which then one Be subjected to sintering.

In the older one Patent Application 10 2009 039 102.9 describes a method in which by drying a Metallpulverschlickers a milled blank is produced.

All These methods have the disadvantage that too much material is removed during milling must be until the tooth part is milled out. With the material loss There is also a lot of work involved.

task

It is therefore the object of the protection claim 1 invention a milling blank to reveal when milling The material loss is minimized and allows a faster milling.

embodiments

In the 1 to 3 the invention will be explained in more detail.

It demonstrate:

1 a round milling blank according to the invention;

2 a block-shaped milling blank according to the invention;

3 a detail of the invention.

1 shows the top view of a round blank 1 , Blanks of this size are manufactured for certain metal milling machines (CoCr) and have a diameter of 98 mm at a thickness of 20 mm. According to the above-cited patent application 10 2009 039 102.9, the production is also possible from dental metal powder. This results in the processing noticeably a large loss of material, since only a very small part of the material in the milled tooth part is ultimately available. But how about the 1 can be seen, there is the milling blank 1 not of a solid material, but of a matrix whose walls and bridges 2 Made of plastic. In this matrix are filling areas 3 provided, which are filled with green material. When using dental metal powder, the filling areas 3 only filled with slurry, which is solidified by drying.

In addition, the shows 1 still empty areas 4 that are irrelevant to the function. The empty areas 4 Of course, they can also be made of plastic. For reasons of savings, however, it is advisable to release these areas.

Like a look at the milling blank 1 shows, the fill areas 3 roughly correspond to the mill shape to be milled. It is therefore expedient in the sense of optimizing the method to have available different matrix forms which minimize the loss of material. For simple copings it is necessary in the filling area 3 only a small amount of material, while a multi-unit bridge framework, which may still be bent, a larger space and a differently shaped filling area 3 requires.

The truss structure is in the 1 shown only schematically.

Actually, you can a disc with the diameter of 98 mm to 30 frames to be milled.

In the manufacture of scaffolding with CAD / CAM machines not only disc-shaped blanks are used, but also block-shaped blanks, which is provided with clamping devices for the milling machine. Such a blank is in 2 shown. As is known, here the milling material consists of a block-shaped block, from which considerable amounts of material must be milled. Again, the above explained construction principle with web 2 , Filling area 3 and empty area 4 be applied.

One Further savings in the construction of the blank according to the invention is that when milling the router without problems can also mill into the plastic material. A part of the wegzufräsenden green material is therefore replaced by cheaper plastic. That means in Extreme case, that an area of the mill to be milled directly on the wall of the filling region can be present. In this case mills the machine in the adjacent area only by the plastic.

The construction of the invention opens up a further advantage in terms of material savings nis, by placing the webs of the dental framework in the wall of the filling area 3 already be provided. A simple solution to this is in 3 shown by in the wall 6 a filling area 3 drilling 7 are provided, which fill when filling the flowable slurry. If milling is necessary at all to make the bars, then this is then reduced to a minimum.

Claims (5)

Milling blank ( 1 ) for producing tooth parts of sinterable material on CAD / CAM machines, characterized in that the milling blank ( 1 ) consists of a matrix of plastic, the filling areas ( 3 ) has for the material to be milled, whose shape is adapted to the tooth parts to be milled. Milling blank according to claim 1, characterized in that the filling areas ( 3 ) are filled with dried dental metal slip. Milling blank according to claim 1 or 2, characterized in that the walls ( 6 ) of the filling areas ( 3 ) by webs ( 2 ) omitting empty areas ( 4 ) are connected. The mill blank according to one of the claims 1 to 4, characterized in that it disc-shaped or cuboid is trained. Milling blank according to one of claims 1 to 4, characterized in that the walls ( 6 ) of the filling areas ( 3 ) Drilling ( 7 ) for the formation of the scaffold webs.