Bulk block for manufacturing dental prosthesis

A method of manufacturing a bulk block for manufacturing a dental prosthesis, the method comprising:

• melting a glass composition comprising 69.0 to 75.0% by weight of SiO2, 12.0 to 14.0% by weight of Li2O, 2.5 to 10.5% by weight of Al2O3, 0.12 to 0.22% by weight of ZnO, 1.1 to 2.7% by weight of K2O, 0.1 to 0.3% by weight of Na2O, and 2.0 to 6.0% by weight of P2O5, water-quenching a glass melt to obtain a glass formed body of coarse size, and firstly pulverizing the glass formed body to prepare glass powder with a maximum mean grain size of less than 300 μm;
• subjecting the glass powder to crystallization heat treatment in a furnace from room temperature to a maximum temperature of 755 to 810° C. for 30 minutes to 6 hours;
• pulverizing the powder subjected to the crystallization heat treatment to produce glass ceramic powder with a maximum mean grain size of less than 100 μm;
• and
• forming the glass ceramic powder into a predetermined shape.

A prosthesis, comprising:

• a glass ceramic matrix;
• and
• a polymer,
• wherein the glass ceramic matrix is composed of an amorphous glass matrix and a crystalline phase dispersed in the glass matrix,
• the crystalline phase comprises as a main crystalline phase at least one selected from a leucite crystalline phase and a lithium disilicate crystalline phase,
• the crystalline phase has a mean grain size of 0.01 to 1.0 μm, and
• the polymer is included in an amount of 20 to 40% by weight with respect to the total weight of the prosthesis.