| CPC A61K 6/833 (2020.01) [A61C 5/73 (2017.02); A61C 5/77 (2017.02)] | 11 Claims |
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1. A dental bulk block comprising a crystalline phase in an amorphous glass matrix,
wherein the crystalline phase comprises lithium disilicate as a main crystalline phase and eucryptite as a sub-crystalline phase, wherein the main crystalline phase occupies at least 50 wt % of the entire crystalline phase and the sub-crystalline phrase occupies a remaining wt % of the entire crystalline phase unoccupied by the main crystalline phase, and
wherein the dental bulk block is a functionally graded material having a main crystalline size gradient with respect to a depth thereof and having no interface at a point of change in main crystalline size gradient value,
wherein the amorphous glass matrix comprises 69.0 to 78.0 wt % of SiO2, 12.0 to 14.0 wt % of Li2O, 5.5 to 10 wt % of Al2O3, 0.21 to 0.6 wt % of ZnO, 2.0 to 3.5 wt % of K2O, 0.3 to 1.0 wt % of Na2O, 0.1 to 0.5 wt % of SrO, 0.3 to 1.0 wt % of CaO, 0.1 to 2.0 wt % of La2O3, and 2.0 to 6.0 wt % of P2O5, wherein a molar ratio of Al2O3/(K2O+ZnO) is 1.2 to 2.2, and
wherein the wt % is based on a total weight of the amorphous glass matrix.
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