O/T Can electrical charge indicate metal under crown?

[Guest guest]

Some dentists follow the sequential removal of amalgams based on the

electrical readings (highest negative current first followed by lower

negative reading etc.).

This got me to wondering if instead of a panoramic xray showing up any

traces of amalgam left under a crown, the same method of reading the

elctrical charge of a metal free crown can help indicate the presence

of any amalgam underneath it?