METHOD FOR MAKING PRESSABLE LITHIUM DISILICATE GLASS CERAMICS,申请号EP19990966091-传众专利搜索

METHOD FOR MAKING PRESSABLE LITHIUM DISILICATE GLASS CERAMICS

申请公布号：EP1149058(B1)

申请号：EP19990966091

申请日期：1999.12.10

申请公布日期：2015.02.18

申请人：

IVOCLAR VIVADENT AG

发明人：BRODKIN, DMITRI;PANZERA, CARLINO;PANZERA, PAUL

分类号：A61K6/033;A61K6/00;A61K6/02;A61K6/027;A61K6/06;C03B19/06;C03B32/02;C03C4/00;C03C10/00;C03C10/04

主分类号：A61K6/033

摘要：<p>This invention is directed to lithium disilicate (Li2Si2O5) based glass-ceramics comprising silica, lithium oxide, alumina, potassium oxide and phosphorus pentoxide. 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 one embodiment directed to the process of making the glass-ceramics, the compositions herein 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.</p>