Patent ID: 8552088

Claim:
A cement, comprising: (A) a first agent comprising (a1) a first polymerizable monomer, (b1) a first filler, (c) optionally, a photopolymerization initiator comprising an α-diketone, and (d) an oxidizing agent; and (B) a second agent comprising (a2) a second polymerizable monomer, which is the same or different from (a1), (b2) a second filler, which is the same or different from (b1), (c) optionally, the photopolymerization initiator, and (e) a reducing agent, wherein: the photopolymerization initiator (c) is present in at least one of the first agent and the second agent, and a total amount of the photopolymerization initiator (c) is from 0.010 to 0.100 parts by weight, based on 100 parts by weight of a total amount of the polymerizable monomers (a1) and (a2); the oxidizing agent (d) and the reducing agent (e) together form a redox polymerization initiator, and a total amount of the oxidizing agent (d) and the reducing agent (e) is from 0.001 to 20 parts by weight, based on 100 parts by weight of the total amount of the polymerizable monomers (a1) and (a2); a ratio of a total weight of the photopolymerization initiator (c) to a total weight of the oxidizing agent (d) and the reducing agent (e), (c)/((d)+(e)), is from 1/27 to 1/10; and a cured product of the cement has a first compression modulus immediately after photocuring the cement in a range from 100 to 400 MPa, and a second compression modulus 24 hours after the photocuring of 500 MPa or more.