Oral Potential Meter

Bio-electrical Facts:
Enamel surface has an electrical potential of 0-20 millivolts in relationship to the negative internal potential. The potential difference occurs due to the difference in ionic strength of the saliva on the external surface and the blood internally as well as tooth metabolism.

More Bio-electrical Facts:
Average resting potential of the external surface is 5-10 millivolts positive. Indirect evidence seems to indicate that the resting potential of the enamel surface is maintained by internal tooth metabolism.

With the application of acid to the enamel of a vital tooth, the surface potential of the tooth becomes a negtive 45-50 millivolts. However, it does not remain at that level but returns very rapidly to it’s resting potential. this change in potential difference alters tooth metabolism and ion movement and is dictated by the tooth’s internal activity.
JD Res 48: 789-94, 1969

Calcium and potassium are found in measurable amounts in the chemicl composition of human enamel fluid. Calcium in the fluid appears to be mobile, exchangeable and could be influecnced by an electrical field. Adv. FI Res…and Dent Caries Prev 4: 163-68, 1965

If tooth metabolism fails, it loses it’s ability to restore resting potential. Calcium tends to then move from the deeper portions of the tooth to the negatively charged plaue on the surface. the subsurface enamel demineralizes and the enamel surface mineralizes.
JADA 83: 1078-80, 1971

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