Zardiackas L D, Stoner G E, Smith F K
Biomater Med Devices Artif Organs. 1976;4(2):193-203. doi: 10.3109/10731197609118650.
The purpose of this investigation was to explore the feasibility of enhancing the electrochemical stability of dental amalgam restorations by a process of "selective interfacial amalgamation." If dental amalgam restorations can be selectively alloyed at the tooth-amalgam interface, to a minor thickness as compared with the dimensions of the bulk amalgam, so as to present a more electrochemically stable phase than psi2 to the oral environment, corrosion will be reduced and desirable qualities of existing amalgams can be utilized. It was found that selective interfacial amalgamation was indeed possible and that it could be readily accomplished using a silver suspension as a cavity liner. By then placing a conventional silver-tin amalgam according to ordinary dental techniques, mercury expressed during hand condensing reacted with the silver in the liner resulting in the formation of an integral amalgam restoration with the more noble psi1 phase adjacent to tooth structure. In vitro corrosion tests of samples so prepared exhibited corrosion resistance far superior to unlined control samples.
本研究的目的是探索通过“选择性界面汞齐化”过程提高牙科汞合金修复体电化学稳定性的可行性。如果牙科汞合金修复体能够在牙齿与汞合金的界面处进行选择性合金化，与整体汞合金的尺寸相比，合金化层厚度较小，从而向口腔环境呈现比psi2更具电化学稳定性的相，那么腐蚀将会减少，并且可以利用现有汞合金的理想性能。研究发现，选择性界面汞齐化确实是可行的，并且使用银悬浮液作为窝洞衬层可以轻松实现。然后按照常规牙科技术放置传统的银锡汞合金，手工压实过程中挤出的汞与衬层中的银发生反应，从而形成一个完整的汞合金修复体，与牙齿结构相邻的是更贵金属的psi1相。对如此制备的样品进行的体外腐蚀试验表明，其耐腐蚀性远优于未衬层的对照样品。
