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    • 9. 发明授权
    • Dental porcelain
    • 牙科瓷器
    • US06187701B1
    • 2001-02-13
    • US09321551
    • 1999-05-28
    • Masato SekinoHiroyuki NakagawaOsamu IwamotoMasaaki Ushioda
    • Masato SekinoHiroyuki NakagawaOsamu IwamotoMasaaki Ushioda
    • C03B804
    • A61K6/0008A61K6/0017A61K6/0094A61K6/0205A61K6/0215
    • Provided is a porcelain which is suitable as a dental porcelain capable of being fired on a ceramics core and has a low firing temperature and a low thermal expansion coefficient and which is excellent in a chemical durability. The above dental porcelain comprises glass containing silicon oxide, aluminum oxide, boron oxide, zinc oxide, sodium oxide and lithium oxide as principal components. The contents of these respective components in the above glass are 57 to 65% by weight of SiO2, 8 to 18% by weight of Al2O3, 15 to 25% by weight of B2O3, 0.1 to 2% by weight of ZnO, 3 to 7% by weight of Na2O and 2 to 8% by weight of Li2O respectively in terms of a percent by weight based on the total of the respective components when the respective components are reduced to SiO2, Al2O3, B2O3, ZnO, Na2O and Li2O respectively. The particularly preferred dental porcelain comprises glass having a thermal expansion coefficient of 6.0×10−6 (1/°C.) or less as a principal structural component.
    • 本发明提供一种适合作为能够在陶瓷芯上焙烧的牙科瓷,并且具有低烧成温度和低热膨胀系数并且化学耐久性优异的瓷器。 上述牙瓷包含含有氧化硅,氧化铝,氧化硼,氧化锌,氧化钠和氧化锂作为主要成分的玻璃。 上述玻璃中的各成分的含量为SiO 2为57〜65重量%,Al 2 O 3为8〜18重量%,B 2 O 3为15〜25重量%,ZnO为0.1〜2重量%,3〜7 相对于各成分分别还原为SiO 2,Al 2 O 3,B 2 O 3,ZnO,Na 2 O,Li 2 O时,各成分的总量,按重量百分比表示,分别为Na 2 O和2〜8重量%的Li 2 O。 特别优选的牙瓷包含热膨胀系数为6.0×10 -6(1 /℃)以下的玻璃作为主要结构成分。