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Sensory and reflex responses to tooth pulp stimulation in man
283 kind of damage than with the fiber population involved. Acute neuropathy causing axonal degeneration of myelinated fibers (and presumably also unmyelinated fibers) was often painful, whereas predominant involvement of large fibers (anticipated to release small fiber impulses) was often not. Reference is also made to previous observations on severely painful neuropai~hies (in Fabry's disease for example), which are associated with selective (chronic) damage of small myelinated and unmyelinated fibers.
STOMATOLOGY Prolonged post-block hypoexcitabflity induced by anodal blockade of cat tooth pulp R.W. Fields, R.B. Tacke, R.J. Beale and B.S. Savara, Exp. Neurol., 50 {1976) 293--303 Changes in the neural excitability of the cat tooth pulp were tested during and following the application of d~xect current to the tooth. Changes in the amplitude of field poter:tials recorded from trigeminal brain stem nuclei and evoked by threshold tooth pulp stiimulation were used as an index of pulpal excitability. The application of direct current resulted in decreases in the amplitude of trigeminal fieTd potentials which were related to the intensity of the "electroanalgesia" current. Depressed excitability persisted for hours following the cessation of all but very low levels of block. The data suggest possible tissue damage and irreversible destruction following electroanalgesia current intensities applied to teeth. Sensc,ry and reflex responses to tooth pulp stimulation in man B. Matthews, J. Baxter and S. Watts, Brain Res., 113 (1976) 8 3 - 9 4 Monopolar and bipolar stimuli were applied to teeth of human subjects to determine (a) sensory thresholds, and (b) effects on masseter and antcrior digastric EMG activity. Both types of stimuli produced sensory thresholds which were not described as painful. No response was detected in the digastric muscle with stimuli up to three times the sensory threshold, but at, or just above sensory threshold, inhibitory effects were produced !tn the masseter muscle. The latency of this "silent period" was 18--22 msec with bipo!~: stimulation, indicating that afferent fibers conducting irt the A5 range parti(ipate in this reflex pathway. It is concluded that some pulpaI afferent fil,ers may not be invo),ved in pain sensations and thai threshold sensory arid reflex responses probably are produced by the same fibers.
STOMATOLOGY Prolonged post-block hypoexcitabflity induced by anodal blockade of cat tooth pulp R.W. Fields, R.B. Tacke, R.J. Beale and B.S. Savara, Exp. Neurol., 50 {1976) 293--303 Changes in the neural excitability of the cat tooth pulp were tested during and following the application of d~xect current to the tooth. Changes in the amplitude of field poter:tials recorded from trigeminal brain stem nuclei and evoked by threshold tooth pulp stiimulation were used as an index of pulpal excitability. The application of direct current resulted in decreases in the amplitude of trigeminal fieTd potentials which were related to the intensity of the "electroanalgesia" current. Depressed excitability persisted for hours following the cessation of all but very low levels of block. The data suggest possible tissue damage and irreversible destruction following electroanalgesia current intensities applied to teeth. Sensc,ry and reflex responses to tooth pulp stimulation in man B. Matthews, J. Baxter and S. Watts, Brain Res., 113 (1976) 8 3 - 9 4 Monopolar and bipolar stimuli were applied to teeth of human subjects to determine (a) sensory thresholds, and (b) effects on masseter and antcrior digastric EMG activity. Both types of stimuli produced sensory thresholds which were not described as painful. No response was detected in the digastric muscle with stimuli up to three times the sensory threshold, but at, or just above sensory threshold, inhibitory effects were produced !tn the masseter muscle. The latency of this "silent period" was 18--22 msec with bipo!~: stimulation, indicating that afferent fibers conducting irt the A5 range parti(ipate in this reflex pathway. It is concluded that some pulpaI afferent fil,ers may not be invo),ved in pain sensations and thai threshold sensory arid reflex responses probably are produced by the same fibers.