Abstract
Thresholds of single pulpal, periodontal, gingival and labial nerve fibres have been measured in cats using both monopolar and bipolar stimulation of teeth. With monopolar stimulation, there was considerable overlap between the thresholds of pulpal and non-pulpal fibres, although the fibres with the lowest thresholds of all were from the pulp. With bipolar stimulation, on the other hand, it was not possible to excite any fibres other than those in the pulp and it is suggested that this technique might provide the basis of a more reliable clinical method for determining the vitality of teeth.
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