Gel phase formation at resin-modified glass-ionomer/tooth interfaces
Gel phase formation at resin-modified glass-ionomer/tooth interfaces
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DOI：
10.1177/154405910708600714
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发表时间：
2007-07-01
影响因子：
7.6
通讯作者：
Van Meerbeek, B.
中科院分区：
文献类型：
--
作者：
Coutinho, E.;Yoshida, Y.;Van Meerbeek, B.
聚链烯酸和羟基磷灰石之间的离子键合可以解释玻璃离聚物在临床试验中的优异键合保持力。我们在这里调查了在何种程度上的树脂改性的玻璃离聚物（RMGIs）的自交联可以归因于这种化学键合能力。因此，3 RMGIs与牙齿基质的相互作用进行了全面的表征，电子和原子力显微镜与X射线光电子能谱（XPS）。2 RMGIs的界面超微结构分析揭示了羟基磷灰石涂层胶原的浅杂交，其上的亚微米凝胶相通过聚链烯酸与从牙本质表面提取的钙的反应而沉积。然而，一个RMGI结合到牙本质上，没有混合层或凝胶相形成。XPS分析表明，RMGIs中的聚羧酸与羟基磷灰石发生了静电相互作用。我们的结论是，RMGIs的自我修复应归因于胶原周围的羟基磷灰石的离子键合，以及额外杂交牙本质的RMGIs的微机械联锁。
Ionic bonding between polyalkenoic acid and hydroxyapatite may explain the excellent bonding retention of glass-ionomers in clinical trials. We have here investigated the extent to which the self-adhesiveness of resin-modified glass-ionomers (RMGIs) can be attributed to this chemical bonding capacity. Therefore, the interaction of 3 RMGIs with tooth substrates was comprehensively characterized, with electron and atomic force microscopy correlated with x-ray photoelectron spectroscopy (XPS). Interfacial ultrastructural analysis for 2 RMGIs disclosed a shallow hybridization of hydroxyapatite-coated collagen, on which a submicron gel phase was deposited through reaction of the polyalkenoic acid with calcium extracted from the dentin surface. One RMGI, however, bonded to dentin without hybrid layer or gel phase formation. XPS indicated that polycarboxylic acids included in the RMGIs electrostatically interacted with hydroxyapatite. We conclude that the self-adhesiveness of RMGIs should be attributed to ionic bonding to hydroxyapatite around collagen, and to micro-mechanical interlocking for those RMGIs that additionally hybridize dentin.