An object of the present invention is to provide a paste-type cement
composition which while retaining adhesion to tooth substance,
biocompatibility, surface curability and fluorine sustained-releasability
which are the characteristics derived from the conventional glass ionomer
cement, reduces water sensitivity which is shortcoming of the
conventional glass ionomer cement, enables simple mixing operation, does
not adversely affect on the various properties of a cured cement
depending on a difference in operators or a skill degree, and can afford
various stable properties. There is provided a two paste-type glass
ionomer cement comprising a resin-based paste containing a hydrophobic
polymerizable monomer and a polymer of acidic group-containing
polymerizable monomers which are insoluble to each other, and a
water-based paste containing a hydrophilic polymerizable monomer and
water which are soluble to each other, in which an acid reactive filler
is contained in at least one of pastes.