Patent ID: 7351753

Claim:
A method for providing a two-part paste/paste dental composition to a tooth surface comprising the steps of: (I) etching a tooth surface with an etchant and/or priming the tooth surface with a primer/adhesive, (II) mixing two pastes of a two-part paste/paste composition to form a mixed composition immediately prior to application to the tooth surface, (III) applying the mixed composition to the tooth surface, and (IV) hardening the mixed composition, wherein the two-part paste/paste composition comprises a first paste comprising (a) at least one polymerizable monomer with a polymerizable group selected from the group consisting of an acrylate, a methacrylate, and a vinyl group; (b) a substituted thiourea selected from the group consisting of 1-(2-pyridyl)-2-thiourea and 1-(2-tetrahydrofurfuryl)-2-thiourea; and (c) a finely divided filler having a mean particle size of less than 50 microns; and a second paste comprising (d) at least one acidic compound containing at least one acidic moiety selected from the group consisting of where R is an alkyl or aryl group; (e) at least one polymerizable monomer without any acidic group with a polymerizable group selected from the group consisting of an acrylate, a methacrylate, and a vinyl group; (f) a hydroperoxide compound with at least one hydroperoxide group attached to a tertiary carbon; and (g) a finely divided filler having a mean particle size less than 50 microns.