Chigira H, Itoh K, Tachikawa T, Wakumoto S, Hisamitsu H
Department of Operative Dentistry, Showa University School of Dentistry, Tokyo, Japan.
J Dent. 1998 Mar;26(2):157-63. doi: 10.1016/s0300-5712(96)00085-1.
To evaluate the effect of two experimental primers based on glyceryl methacrylate (GM, 2,3-dihydroxypropyl methacrylate) and 2-hydroxyethyl methacrylate (2-HEMA) on the marginal adaptation of light-cured composite placed into cylindrical dentine cavities and to study the interfacial microstructure.
The bonding efficacy of two experimental dentine primers combined with a dentine cleanser composed of either 0.5 mol l-1 EDTA neutralized to pH 7.4 by sodium hydroxide or 10% citric acid containing 3% ferric chloride (10-3 solution), and a commercial dentine bonding agent containing phosphate ester, were examined by measuring the wall-to-wall polymerization contraction gap of a commercial light-activated resin composite placed into cylindrical dentine cavities. The adhesive interface between the dentine and the dentine adhesive was observed using a transmission electron microscope (TEM).
The formation of a contraction gap was completely prevented by priming with GM, regardless of the dentine cleanser used. However, in groups primed with 2-HEMA, gap formation was observed in three and four specimens out of 10 in the groups that were cleaned with the EDTA and 10-3 solution, respectively. In samples primed with GM, a high-density layer was observed by TEM at the superficial dentine in the hybrid layer, which may have indicated a high monomer content, whereas no density variations were observed in the hybrid layer in samples primed with 2-HEMA.
评估两种基于甲基丙烯酸甘油酯（GM，甲基丙烯酸2,3 - 二羟丙酯）和甲基丙烯酸2 - 羟乙酯（2 - HEMA）的实验性底漆对置于圆柱形牙本质洞中光固化复合材料边缘适应性的影响，并研究其界面微观结构。
通过测量置于圆柱形牙本质洞中的市售光固化树脂复合材料的壁对壁聚合收缩间隙，检测两种实验性牙本质底漆与由氢氧化钠中和至pH 7.4的0.5 mol l-1乙二胺四乙酸（EDTA）或含3%氯化铁的10%柠檬酸（10 - 3溶液）组成的牙本质清洁剂以及含磷酸酯的市售牙本质粘结剂的粘结效果。使用透射电子显微镜（TEM）观察牙本质与牙本质粘结剂之间的粘结界面。
无论使用何种牙本质清洁剂，用GM底漆处理均能完全防止收缩间隙的形成。然而，在用2 - HEMA底漆处理的组中，分别用EDTA和10 - 3溶液清洁的组中，10个样本中有3个和4个样本观察到间隙形成。在用GM底漆处理的样本中，通过TEM在混合层的表层牙本质处观察到高密度层，这可能表明单体含量高，而在用2 - HEMA底漆处理的样本的混合层中未观察到密度变化。
