Adhesion between the Composite Resin and Dentin by Amino-acid Derivatives Primers

为提高修复树脂的粘附性，对牙面处理的效果及其机制进行了研究。通过傅立叶变换红外光谱(FT-IR)、扫描电子显微镜(SEM)和酸蚀处理后的牙本质与胶原蛋白的粘接强度研究，得到了以下结果：水是HEMA吸附到胶原纤维上的基本成分。当HEMA在水溶液中的浓度范围为6-60wt%时，胶原纤维可以吸附大量的HEMA。给出了不同处理方法处理的牙本质板的扫描电子显微镜照片。如实验部分所述，羟基磷灰石被移除，只露出胶原纤维。经磷酸和琥珀酸处理的牙本质板仅显示牙本质的牙本质小管结构，但没有显示单独的胶原纤维。由于聚集体的形成，所有的胶原纤维都崩塌了，外观光滑。与这两个只用酸处理的样品相反，用磷酸处理后再用HEMA溶液处理的样品清楚地显示出单独的胶原纤维。这种形态差异可能是由于吸收的HEMA的抗塑变而产生的僵硬效应所致。复合树脂在磷酸、30%HEMA、柠檬酸、30%HEMA和EDTA、30%HEMA水溶液中的拉伸粘结强度分别为12.07、10.9和7.04 Mpa。

The effect of tooth surface treatment and its mechanism was examined to obtain improved adhesion of restoraive resin. From the fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and adhesive strength studies with respect to collagen and acid-etched dentin, treated with aqueous solution of 2-hydroxyethyl methacrylate (HEMA), the following results were obtained. Water was an essential component in respect to the adsorption of HEMA to collagen fiber. Substantial amounts of HEMA were adsorbed by collagen fiber when the concentration range of HEMA in aqueous solution was 6-60wt%. Scanning electron photomicrographs of the dentin plates treated by various methods are illustrated. As stated in the Experimental section, the hydroxyapatite is removed and only collagen fibers are exposed. The phospholic acid and succinic acid-treated dentin plates show only dentinal-tuble structure of the dentin, but do not show individual collagen fibers. All collagen fibers collapsed and show a smooth appearance due to aggregate formation. Contrary to these two samples treated only by acid, the sample that is pre-treated by phospholic acid followed by HEMA solution treatment clearly shows individual collagen fibers. This morphological difference is likely caused by a stiffening effect by anti-plastization of the absorbed HEMA. In regard to tensile bond strength of a composite resin to dentin, 12.07, 10.9, and 7.04 MPa was obtained with phosphoric acid, 30%HEMA, citric acid, 30%HEMA and EDTA, 30%HEMA aqueous solution, respectively.