Device for fixing blank in machine for making dental prostheses

摘要

The holder section for the blank is held inside a boring in a holder device and then locked into position by a twisting a screw into a specially shaped groove around the outside of the holder section. The blank (1) is attached to a support plate (5) mounted on a rotation symmetrical holder section (7) that is received by a first rotation symmetrical boring (9) inside the shaft part of a holder device (11), A clamping screw (19) is used to fix the holder section into position. A groove (30) extending around the outside of the holder section mantle receives at least part of the screw, which is smaller than or equal in size to the groove. The internal groove dimensions enable the screw to be moved into a position where it is pressed against the groove walls and prevents rotation of the holder section about its length axis (A). Preferably this is achieved by tapering the groove walls towards its base facing the rotation axis of the holder section. An Independent claim is also included for a dental prothesis blank, comprising a the above dental prothesis blank section and the above holder (3).