MORPHOLOGICAL ASPECTS OF THE RESIN-DENTIN INTERDIFFUSION ZONE WITH DIFFERENT DENTIN ADHESIVE SYSTEMS
MORPHOLOGICAL ASPECTS OF THE RESIN-DENTIN INTERDIFFUSION ZONE WITH DIFFERENT DENTIN ADHESIVE SYSTEMS
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DOI：
10.1177/00220345920710081301
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发表时间：
1992-08-01
影响因子：
7.6
通讯作者：
VANHERLE, G
中科院分区：
文献类型：
--
作者：
VANMEERBEEK, B;INOKOSHI, S;VANHERLE, G
用Ar-离子束蚀刻树脂-牙本质界面的横截面，使扫描电子显微镜可以检测到它们的亚结构。牙本质粘接系统从形态上分为三组，并试图阐明它们的粘接机制。第一组产品去除了玷污层。氩离子轰击清楚地揭示了一层混合或树脂浸渍的牙本质层。据推测，酸性或螯合剂的调节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，亲水单体被认为改变了这种胶原纤维的排列，从而促进了粘性树脂的渗透，导致了胶原蛋白和粘性树脂之间机械的、混合的联系。第二组保留了涂抹层。在这个病例中，牙本质小管在其开口处被球状颗粒遮盖，并在这些涂抹塞子下面保持开放。这种粘接系统的目的是将涂抹层结合到亲水性单体中，这些单体与底层牙本质的有机和/或无机成分具有亲和力。最后，第三个小组仅部分溶解涂抹层，形成薄薄的浸渍树脂的牙本质层和浸渍树脂的涂抹层。这项研究清楚地表明，最近粘接系统的应用导致牙本质表面形态的结构变化，在深层未接触的牙本质层和复合充填材料之间产生了一个保持界面，称为互扩散区。这种树脂-牙本质互扩散区为与树脂复合材料的共聚提供了粘结部位，同时可能对牙髓组织具有保护作用。
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 interdiffusion 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.