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    • 10. 发明授权
    • Investment material and mold for dental use and burnout thereof
    • 用于牙科使用和烧毁的投资材料和模具
    • US5373891A
    • 1994-12-20
    • US866901
    • 1992-04-06
    • Haruhisa KatoKiyoshi Mitsui
    • Haruhisa KatoKiyoshi Mitsui
    • A61K6/027B22C1/00
    • A61K6/0625
    • Dental investment materials for providing inexpensive dental investments which are free from the occurrence of cracks, crevices or breakage and can greatly reduce the metal casting time, dental casting molds using the same and a process for burning them. The dental investment material contains as the major components a calcined gypsum powder, a cristobalite powder and a quartz powder and additionally contains a gas permeability improving additive. In the dental investment prepared using such dental investment material, the thermal expansion can be dispersed and the steam pressure generated can be released effectively during calcination and burning.
    • 用于提供廉价牙科投资的牙科投资材料,其不会发生裂纹,裂缝或断裂,并且可以大大减少金属铸造时间,使用其的牙科铸造模具和用于燃烧它们的工艺。 牙科投资材料包含煅烧石膏粉,方英石粉和石英粉的主要成分,另外含有透气性提高添加剂。 在使用这种牙科投资材料制备的牙科投资中,可以分散热膨胀,并且在煅烧和燃烧期间可以有效地释放所产生的蒸汽压力。