Studies on the Electric Potential of Similar Dental Alloys

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Electric phenomen of dental metal in mouth have been described and discussed in many papers, and the E. M. F. of dissimilar metals have been determined. On the other hand, it is well known that when a metal is immersed in electrite solution, electric current does occur between the tissues of high potential and those of low potential and corrosion of the metal is increased. We have determined the electric potential of similar dental metals and alloys in various condition of them as follows : (1) Potential in physiological salt solution 1) Between polished and unpolished metals 2) Between polished and rough polished surfaces of metals 3) Between polished and corrosive surfaces of metals (2) Potential in oral saliva 1) Between polished and rough polished surfaces of metals 2) Between polished and corrosive surfaces of metals The results are as follows: 1) Our experiments appear to demonstrate conclusively that electric current will exist in the mouth even if the mouth contains similar dental metals alone. 2) The phenomen of polarization undoubtly reduces the current somewhat, but not to zero. 3) The potential difference is higher in physiological salt solution than in oral saliva. 4) The value of potential difference is due to the difference of surface fineness and the condition of corrosive substances.
口腔病学会の論文