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If access is made in gold crown for endodontic procedure and after completion of procedure

 # If access is made in gold crown for endodontic procedure and after completion of procedure hole is filled with amalgam, which is correct about subsequent possible event?
A.  Amalgam will act as anode to gold  
B. Amalgam will act as cathode to gold
C. Circuit will not be formed
D. All of the above



The correct answer is A. Amalgam will act as anode to gold.

If an amalgam is in direct contact with an adjacent metallic restoration such as a gold crown, the amalgam is the anode in the circuit. This type of electrochemical corrosion is called galvanic corrosion and is associated with the presence of macroscopically different electrode sites.


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