a bioactive cement comprises a filler consisting of nonalkali glass powder containing ca , monomer containing hydrophilic dimethacrylate , a polymerization starter , and a polymerization promotor . the nonalkali glass powder containing ca comprises a composition by weight of 40 - 50 % cao , 30 - 40 % sio 2 , 10 - 20 % p 2 o 5 , 0 - 10 % mgo , and 0 - 2 % caf 2 . the hydrophilic dimethacrylate is 2 , 2 - bisphenyl ] propane . the bioactive cement is capable of forming a hydroxyapatite layer on a surface of a hardened cement body when the hardened cement body is brought into contact with body fluid .