A reaction which takes place that weakens the strength of metals when two incompatible metals are placed together.

results from a difference in electric potentials between dissimilar metal filings in opposing or adjacent teeth. Fillings, in conjunction with saliva, make up an electric cell. When opposing fillings touch, they short-circuit the cell and, if the flow of current takes place through the pulp, the patient will experience a sensation or, sometimes, pa [..]

Wasting away of two unlike metals due to electrical current passing between them. The action is increased in the presence of moisture.