Abstract
Field potentials were recorded in the trigeminal sensory complex in response to monopolar and bipolar stimulation of the tooth pulp to characterize the resultant activity of pulpal and extrapulpal origin. Monopolar and bipolar stimulation of pulpal elements resulted in identical responses. Using monopolar stimulation, cathodal thresholds were usually but not universally less than anodal thresholds. Spread of activity to include periodontal afferents occurred at intensities somewhat above that necessary for maximal pulp responses. No spread of activity was found either to gingival afferents using monopolar stimulation or to gingival or periodontal afferents using bipolar stimulation at any stimulus intensity.
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