Objective:The corrosion potential values were measured in vivo for dental amalagam,To determine the variability of the corrosion potential of dental amalgam restorations,for 30 days.Methods:Measurements were made with a high impedance voltmeter,a Ag/AgCl micro-reference electrode and a mic-ro-probe.The subjects were the patients who treated with restoration using amalgam before(2 months、1 year、2 years、3 years、5 years).The subjects were not to alter their uaual eating and oral hygiene routines.Corrosion pote...