PURPOSE:To carry out bonding of a resin to dentine, by treating the surface of dentine with a treating liquid produced by adding glutaraldehyde and FeCl3 to an aqueous solution of EDTA adjusted to a specific pH, washing the surface- treated dentine with water, drying the surface, applying a primer added with tri-n-butylborane to the dentine and bonding with a resin. CONSTITUTION:(A) An aqueous solution of EDTA adjusted to pH7.4 is added with (B) glutaraldehyde and (C) FeCl3 to obtain a dentine-treating liquid (the concentrations of the compounds A, B and C are 0.1-1.0mol./l, 0.01-20pts.wt. and 0.01-5.00pts.wt. per 100pts.wt. of water, respectively). The surface of dentine is treated with the obtained dentine-treating liquid, washed with water, dried and coated with a primer composed of an ethylenic unsaturated monomer [e.g. (meth)acrylate monomer], a (meth)acrylate polymer and tri-n-butylborane. A restoration composite resin is filled in a cavity of the treated dentine. The above treating liquid has high safety, is effective in simplifying the process and provides good bonded state.
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