| 摘要 |
The invention relates to a dental milling tool for machining pre-sintered ceramic white bodies on multi-axis CNC machines, comprising a ball head portion (1) which is rounded in a semipherical manner and which, at its largest outer diameter (Dk), approximately 1-4 mm, transitions into an axial cutting portion (2) that runs in the axial direction with said diameter (Dk) at the outer circumference in a constant manner, said axial cutting portion being adjoined by a shaft portion (3) which extends axially with a larger or at least equally large shaft diameter (Ds). Three, preferably two flutes (4) and a corresponding number of cutting wedges (5) extend in a spiral manner around a core portion (9), which consists of a solid material and which has a circular cross section, from the ball head portion (1) along the axial cutting portion (2). A blade (6) which extends in the shape of an arc in the ball head portion (1) when seen in the axial direction and which extends at the radial coordinate of the largest outer diameter (Dk) in the axial cutting portion (2) is provided on each cutting wedge (5) outer edge facing the flute (4) in the right-hand rotational direction. The invention is characterized in that the flutes (4) and the cutting wedges (5) extend in a spiral manner with a left-hand helix. The invention further relates to a milling method for producing dental prosthesis parts, said method being characterized in that a dental prosthesis white body which is to be sintered into the completed dental prosthesis part is milled out of a pre-sintered ceramic white body, in particular a zirconium dioxide white body, on a multi-axis CNC milling machine with a milling tool according to one of the preceding claims using 3D freeform milling process along generated travel paths. |
