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KMID : 0378019870300020073
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New Medical Journal
1987 Volume.30 No. 2 p.73 ~ p.79
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Changes in conduction velocity of single pulp fiber by electrical stimulation of canine tooth pulp and inferior alveolar nerve in the dog
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Abstract
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This experiment was done to observe changes in conduction velocity of single pulp fiber by electrical stimulation of canine tooth pulp and inferior alveolar nerve in the dog. The action potential of single pulp fiber was recorded at the distal stump of inferior alveolar nerve and electrical stimulation was done in tooth pulp and infereior alveolar nerve near the mandibular canine. The results are as follows:
1. 88-pulpal afferent fibers showed all or none response to the electrical stimulation of canine pulp and inferior alveolar nerve.
2. The mean conduction velocity of 88 pulpal fibers was 2.28m/sec and the mean threshold was 22.3V by electrical stimulation of canine pulp.
3. The conduction velocity and threshold were changed to mean 44.8m/sec and 1.3V by electrical stimula :ion of inferior alveolar nerve.
4. In canine pulp stimulation, group A-delta afferent fibers were 69 (78.4%) and group A-beta afferent fiber were 19 (21.6%) out of 88 fibers.
5. In inferior alveolar nerve stimulation, group A-delta afferent fibers were 16(18%) and A-beta afferent fiber were 72(82%) out of 88 fibers.
Summarizing above results, pulpal afferent fibers showed mean 22.7m/sec faster conduction velocity in inferior alveolor nerve stimulation than in canine pulp stimulation. It suggests that there are more group A-beta afferent fibers in pulpal afferent fibers innervating canine of dog.
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