Clinical management of galvanic current between gold and amalgam.

Placing a strip of rubber dam or similar insulator between the contacting dissimilar restorations is a diagnostic technique for relieving and evaluating painful galvanic currents. Treatment modalities vary according to severity of pain. In cases of little or no pain, nothing is done, and corrosion products are allowed to form an insulating cover over the offending restoration. For patients with severe pain that does not improve, treatment may consist of placing a composite restoration in the amalgam restoration to break the interproximal dissimilar-metal contact. For painful currents caused by occluding restorations, a coating of unfilled light-cured resin over the offending amalgam breaks the metal contact and allows corrosion product buildup. Galvanic currents can occur and cause pain, but this is generally shortlived and should not influence the dentist's choice of an appropriate restorative material.