Van Meerbeek B, Inokoshi S, Braem M, Lambrechts P, Vanherle G
Department of Operative Dentistry and Dental Materials, Katholieke Universiteit te Leuven, Belgium.
J Dent Res. 1992 Aug;71(8):1530-40. doi: 10.1177/00220345920710081301.
Cross-sections of resin-dentin interfaces were etched with an argon-ion beam to make their substructure detectable by scanning electron microscopy. The dentin adhesive systems were categorized morphologically into three groups, and an attempt was made to clarify their adhesive mechanism. The first group of products removed the smear layer. The argon-ion bombardment clearly disclosed a hybrid or resin-impregnated dentin layer. It is hypothesized that conditioning with acidic or chelating agents demineralized the dentin surface-layer to a certain depth, leaving behind a collagen-rich mesh-work. Hydrophilic monomers are then believed to alter this collagen-fiber arrangement in a way that facilitates penetration of the adhesive resin, resulting in a mechanical, intermingled link between collagen and the adhesive resin. The second group preserved the smear layer. In this case, the dentinal tubules were obliterated with globular particles at their orifices and remained patent underneath these smear plugs. This type of adhesive system aims at the incorporation of the smear layer into the hydrophilic monomers, which have an affinity for the organic and/or inorganic components of the underlying dentin. Finally, a third, small group only partly dissolved the smear layer, creating a thin resin-impregnated dentin layer and a resin-impregnated smear plug. This study clearly showed that the application of recent adhesive systems induced structural changes in the dentin surface morphology, creating a retentive interface, called the inter-diffusion zone, between the deep, untouched dentin layers and the composite filling material. This resin-dentin interdiffusion zone offers bonding sites for copolymerization with the resin composite and, concurrently, might have protective potential for the pulp tissues.
用氩离子束蚀刻树脂 - 牙本质界面的横截面，以便通过扫描电子显微镜检测其亚结构。根据形态学将牙本质粘结系统分为三组，并试图阐明其粘结机制。第一组产品去除了玷污层。氩离子轰击清楚地显示出一个混合层或树脂浸渍牙本质层。据推测，用酸性或螯合剂处理会使牙本质表层脱矿到一定深度，留下富含胶原蛋白的网状结构。然后认为亲水性单体以促进粘结树脂渗透的方式改变这种胶原纤维排列，从而在胶原蛋白和粘结树脂之间形成机械混合连接。第二组保留了玷污层。在这种情况下，牙本质小管在其开口处被球状颗粒堵塞，在这些玷污栓下方仍保持开放。这种类型的粘结系统旨在将玷污层纳入对下层牙本质的有机和/或无机成分具有亲和力的亲水性单体中。最后，第三小类仅部分溶解玷污层，形成一个薄的树脂浸渍牙本质层和一个树脂浸渍玷污栓。这项研究清楚地表明，应用最新的粘结系统会导致牙本质表面形态发生结构变化，在深层未受影响的牙本质层和复合填充材料之间形成一个称为相互扩散区的保留界面。这个树脂 - 牙本质相互扩散区为与树脂复合材料的共聚提供了粘结位点，同时可能对牙髓组织具有保护作用。
