A study on Adhesion Mechanism between Adhesive resin and Dentin

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We have reported that Phosphoric Methacrylate adhesive resin (Panavia21, Kuraray, Japan) has strong adhesion and excellent adhesive durability to dentin pretreated with H_3PO_4 and NaClO.The purpose of this study was to clarify the adhesion mechanism between adhesive resin and dentin by TEM observations.The following results were obtained.1) Dentin treated with H_3PO_4 and NaOCl appeared to remain intact.2) Although it has been reported that a hybrid layr does not exist on dentin pretreated with H_3PO_4 and NaOCl, a very thin hybrid layr was observed in this study.3) When a self-etching primer was applied on dentin pretreated with H_3PO_4 and NaOCl, a hybrid layr containing resin-encapsulated hydroxylapatite was created in relatively intact dentin4) The reason for the excellent adhesive durability of the the hybrid layr on dentin pretreated with H_3PO_4 and NaOCl, in comparison with a hybrid layr formed in a denatured collagen layr, was thought to be due to the absence of smear and denatured collagen.