A study on Adhesion Mechanism between Adhesive resin and Dentin

我们报道了甲基丙烯酸磷酸酯胶粘剂树脂（Panavia21，Kuraray，Japan）对经H_3PO_4和NaClO处理的牙本质具有较强的粘接力和良好的粘接持久性。本研究旨在通过透射电镜观察，阐明粘接树脂与牙本质的粘接机理。结果表明：1）经H_3PO_4和NaOCl处理的牙本质保持完整。在本实验中，我们观察到了一个很薄的混合层。3）在用H_3PO_4和NaOCl预处理过的牙本质上涂上自酸蚀底涂层后，我们观察到了一个很薄的混合层。在相对完整的牙本质中产生含有树脂包封的羟基磷灰石的混合层4）经H_3PO_4和NaOCl预处理的牙本质上形成的杂化层比变性胶原层具有更好的粘接持久性，其原因可能是由于杂化层中没有污迹和变性胶原。

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.