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  • Title: Interface corrosion in amalgam-to-amalgam and amalgam-to-nonprecious metal crown couplings.
    Author: Schimelmitz H, Bapna MS, Punwani I, Ashrafi SH, Anderson AW.
    Journal: J Prosthet Dent; 1986 Feb; 55(2):189-94. PubMed ID: 3457150.
    Abstract:
    This study examined the contact surface area in the coupling of a class II amalgam restoration with another class II amalgam restoration or with a stainless steel or nickel-chrome crown in 1% NaCl solution. The characterization of interfaces was carried out by using SEM and EDX microanalysis. The results indicate that the coupling of an amalgam-stainless steel crown and an amalgam-inconel crown in NaCl solution forms a deposit on the crown surfaces. This deposit contains all the constituents of corrodible phases of amalgam, including Zn. If amalgam restorations in adjoining teeth are contemplated, non-Zn-containing amalgam alloys of the same composition should be considered.
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