Abstract
When an electrical impulse is passed through a human tooth to determine the pain perception threshold, the effective stimulus is the current density (current per unit area) at the place where excitation occurs. It was therefore suggested that passing the current through a larger area at the pulpo-dentinal junction would necessitate an increase in current strength to maintain the current density at a level sufficient to excite receptors. This was found to be true up to a limiting value at which level it is speculated that the current density might be sufficiently great to cause excitation of nerve fibres in the pulp canal.
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