Adhesiveness of Resin to Acid-etched Dentin :-Structural Change of Adherent Surface and Durability of Adhesiveness, Following to the Pretreatment with Aqueous Solution of HEMA

Abstract

The effect of surface treatment on structural change of dentinal collagen and the durability of its adhesiveness to resin was examined and the mechanism considered.From transmisson electron microscopy(TEM), scanning electron microscopy(SEM)and adhesive strength test for acid-etched dentin, treated with an aqueous solution of 2-hydroxyethyl methacrylate(HEMA), the following results were obtained.The microfibril structures of dentinal collagen fibers were transformed following the application of HEMA.The resin was impregnated layer produced by this procedure considerably thicker than that without HEMA.Respective adhesive and tensile strengths of 12.07 and 11.75MPa were obtained after immersion in water 37℃ for one day or after 20, 000 thermal cycles, indicating only a slight decrease.