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    • 7. 发明公开
    • HERSTELLUNG DENTALER FORMTEILE AUS PORÖSEM GLAS
    • HUSTELLUNG DENTALER FORMTEILE AUSPORÖSEMGLAS
    • EP2651839A1
    • 2013-10-23
    • EP11805477.4
    • 2011-12-19
    • Ivoclar Vivadent AG
    • REINSHAGEN, JörgCRAMER VON CLAUSBRUCH, SaschaWINTERLING, Michael
    • C03C3/091C03C11/00C03C4/00C03B19/06A61K6/027
    • A61C13/0022A61C13/08A61K6/0276A61K6/033C03B19/06C03C4/0021C03C11/00Y10T428/21
    • The invention relates to a blank for producing shaped dental parts which consists entirely of porous glass without crystalline material. The density of the blank is in the range from 50% to 95% of its theoretical density. It has a disc-like shape having a diameter of at least 20 mm. The blank is produced by a process in which glass powder is firstly pressed at a pressure in the range from 10 MPa to 300 MPa and this green body is (pre)sintered at a temperature in the range from 580°C to 750°C to give a blank composed of porous glass without crystalline material. Monolithic shaped dental parts can be obtained from the resulting blank by mechanical machining and subsequent sintering, with a process according to the invention being employed to stabilize the shape of the shaped parts. The glass preferably contains: SiO
      2 50 - 80% by weight, Al
      2 0
      3 3 - 24% by weight, K
      2 O 3-13% by weight, Na
      2 O 3-13% by weight, Li
      2 O 0-4% by weight, B
      2 O
      3 0-4% by weight, F 0-4% by weight, TiO
      2 0-8% by weight, ZrO
      2 0-8% by weight, P
      2 O
      5 0-4% by weight, SnO
      2 0-4% by weight, MgO 0-4% by weight, CaO 0-4% by weight, BaO 0-4% by weight, Sb
      2 O
      3 0-4% by weight, CeO
      2 0-8% by weight.
    • 本发明公开了一种用于生产牙科部件的坯料,其全部由无结晶部分的多孔玻璃制成。 坯料的密度在其理论密度的50%至95%之间。 它具有直径至少为20mm的圆盘形状。 坯料通过首先在10MPa至300MPa的压力下压制玻璃粉末并在580℃至750℃的温度下预烧结的方法来生产,以形成 没有结晶部分的多孔玻璃的空白。 从获得的坯料中,可以通过机械加工然后烧结获得整体式牙形部件,其中使用根据本发明的用于稳定成形部件的形状的方法。