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    • 127. 发明授权
    • METHOD FOR MOLDING DENTAL RESTORATIONS AND RELATED APPARATUS
    • 法成型牙齿修复与设备
    • EP0711133B1
    • 2002-01-30
    • EP95919141.2
    • 1995-05-10
    • TEC VENTURES, INC.
    • PETTICREW, Richard
    • A61C13/20
    • C03C4/0021A61C13/20B28B1/24B28B5/04C03C3/097C03C10/00Y10T428/13
    • The present invention is concerned with a process for the formation of dental restorations from glass-ceramic materials and the resulting dental restorations. In this invention a dental restoration is prepared by placing a glass ceramic material in a heat-pressure deformable crucible. Heat is then applied to the crucible in order to bring glass-ceramic material to a working range at temperatures above its liquidus temperature. The heat deformation properties of the crucible must be such that when the glass-ceramic material in the crucible is in the working range the crucible is heat-pressure deformable without rupturing. Once the glass-ceramic material is heated to its working temperature the crucible is brought into contact with a mold having a preformed cavity therein, the cavity being in the shape of the desired dental restoration. As the distance between the heated glass ceramic material and the mold is decreased, the crucible is deformed to form a seal with the mold thereby facilitating the injection of the molten glass-ceramic material into the mold cavity. The resulting dental restoration has superior optical esthetic and strength properties. The invention further includes the heat-pressure deformable crucible which is useful in the process of this invention and the related apparatus.
    • 牙科修复所有这是从具有以下组成(按重量百分比计)的玻璃 - 陶瓷材料形成的:
        • 128. 发明公开
        • PRESSABLE LITHIUM DISILICATE GLASS CERAMICS
        • 可压缩锂硅玻璃陶瓷
        • EP1149058A2
        • 2001-10-31
        • EP99966091.3
        • 1999-12-10
        • JENERIC/PENTRON Incorporated
        • BRODKIN, DmitriPANZERA, CarlinoPANZERA, Paul
        • C03C10/04A61K6/06C03B32/02C03B17/06
        • C03C4/0021A61K6/0008A61K6/0094A61K6/0215A61K6/0235A61K6/024A61K6/025A61K6/0255A61K6/0273A61K6/033C03B19/06C03B32/02C03C10/0027
        • This invention is directed to lithium disilicate (Li2 Si2 O) based glass-ceramics comprising silica, lithium oxide, alumina, phosphorus pentoxide, and optionally potassium oxide or tantalum oxide. The glass-ceramics are useful in the fabrication of single and multi-unit dental restorations (e.g. anterior bridges) made by heat pressing into refractory investment molds produced using lost wax techniques. The glass-ceramics have good pressability, i.e., the ability to be formed into dental articles by heat-pressing using commercially available equipment. In accordance with an embodiment directed to the process of making the glass-ceramics, the starting compositions are melted at about 1200° to about 1600 °C, thereafter quenched (e.g., water quenched or roller quenched) or cast into steel molds, or alternately, cooled to the crystallization temperature. The resulting glass is heat-treated to form a glass-ceramic via a one or two step heat-treatment cycle preferably in the temperature range of about 400° to about 1100 °C. The resulting glass ceramics are then pulverized into powder and used to form pressable pellets and/or blanks of desired shapes, sizes and structures which are later pressed into dental restorations.
        • 本发明涉及包含二氧化硅,氧化锂,氧化铝,五氧化二磷和任选的氧化钾或氧化钽的基于二硅酸锂(Li 2 Si 2 O)的玻璃陶瓷。 微晶玻璃可用于制造通过热压成为使用失蜡技术生产的耐火熔模制造的单牙和多牙修复体(例如前牙桥)。 微晶玻璃具有良好的可压缩性,即通过使用市售设备热压制成牙科制品的能力。 根据涉及制造玻璃陶瓷的方法的实施方案,将起始组合物在约1200℃至约1600℃下熔化,然后骤冷(例如水淬或辊骤冷)或铸造成钢模,或者交替地 ,冷却至结晶温度。 通过优选在约400℃至约1100℃的温度范围内的一步或两步热处理循环对得到的玻璃进行热处理以形成玻璃陶瓷。 然后将所得的玻璃陶瓷粉碎成粉末并用于形成可压制的丸粒和/或具有所需形状,尺寸和结构的坯料,所述形状,尺寸和结构随后被压入牙科修复体中。