Dental glass ceramics, main ingredients are Lithium Disilicate, through special process. high translucency (HT). HT: A1, A2, A3, A3.5, B1,B2,C1,C2, BL1, BL2, BL3, BL4. Because of its simple, rapid crystallization process and the effect of ultra high aesthetic repair, as the CAD high intensity of repair materials selection.