Silicate glass, method for preparing silicate glass-ceramics by using the silicate glass, and method for preparing nano lithium disilicate glass-ceramics by using the silicate glass

A method for preparing an artificial tooth block for CAD/CAM machining, the method comprising:

• melting a glass composition and performing crystal growth;
• performing a primary heat treatment at a temperature of 300 to 700° C. for 1 minute to 2 hours to obtain a nano lithium disilicate glass-ceramics;
• and
• bonding the primarily heat-treated glass-ceramics to a zirconia post by using an in organic bond,
• wherein the bonding comprises heat-treating the inorganic bond at a temperature of 700 to 900° C. for 1 minute to 2 hours, and
• wherein the glass composition includes:
• 70 to 85 wt % SiO2, 10 to 13 wt % Li2O, 3 to 7 wt % P2O5 working as a nuclei formation agent;
• 0 to 5 wt % Al2O3 for increasing a glass transition temperature and a softening point and enhancing chemical durability of glass;
• 0 to 2 wt % ZrO2, 0.5 to 3 wt % CaO for increasing a thermal expansion coefficient of the glass;
• and
• 0.5 to 3 wt % Na2O, 0.5 to 3 wt % K2O, and 1 to 2 wt % colorants, and 0 to 2.0 wt % mixture of MgO, ZnO, F, and La2O3.