Caliber spectra of dental nerves in dogs and cattle

Graf, Wilhelm; Hjelmquist, U.

doi:10.1002/cne.901030208

Cited by 21 publications

(7 citation statements)

References 3 publications

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“…10) it is clear that many units slowed by more than 30 %, and in these cases it is likely that the fibres became thinner in the tooth. Cooling and tapering of nerves in the teeth would account for the lack of correspondence between the mean conduction velocities in the peripheral portions of pulpal afferents measured here and the diameters of nerves in the toothpulp observed histologically (Brookhart, Livingston & Haugen, 1953;Graf & Hjelmquist, 1955;Johnsen & Karlsson, 1974;Beasley & Holland, 1978). The fact that a proportion of the pulpal afferents tested could not be excited from the main sensory nucleus or the nucleus caudalis, or both, does not necessarily indicate that these nerves did not project to those areas; the stimulating electrodes may not have been close enough to the nerves to excite them.…”

Section: Discussionmentioning

confidence: 66%

Some anatomical and electrophysiological properties of tooth‐pulp afferents in the cat.

Lisney¹

1978

The Journal of Physiology

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SUMMARY1. The responses of nerves which could be excited by electrical stimulation of the canine tooth-pulp were recorded from the trigeminal ganglion.2. Preliminary experiments showed that the responses of mandibular canine pulpal afferents were recorded from the postero-lateral part of the trigeminal ganglion whereas the responses of maxillary canine pulpal afferents were recorded from the central part of the ganglion.3. The conduction velocity differed in various parts of these nerves; the conduction velocity inside the tooth tended to be slower than that from the tooth to the trigeminal ganglion; the mean conduction velocity in the part of the nerve peripheral to the trigeminal ganglion was faster than that in the part central to the ganglion, and in the central part the conduction velocity decreased caudally. 4. Collision experiments combining tooth stimulation and stimulation of sites in the trigeminal sensory nuclear complex were carried out to investigate the projections of individual pulpal afferents.5. The results of these experiments showed that some tooth-pulp afferents bifurcate and project to both the main sensory nucleus and the nucleus caudalis. For other pulpal afferents only a projection to the main sensory nucleus or the nucleus caudalis could be demonstrated.6. Pulpal afferents that bifurcated had faster conduction velocities than those for which no bifurcation could be shown.

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Section: Discussionmentioning

confidence: 66%

Some anatomical and electrophysiological properties of tooth‐pulp afferents in the cat.

Lisney¹

1978

The Journal of Physiology

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“…These differences could be attributed to the variation in the sensitivity of guaging methods used, or other unknown factors. Most of the size studies on animals (Graf and Hjelmquist 1955;Johnsen and Karlsson 1974;Beasley and Holland 1978;Fried and Hildebrand 1981;Holland and Robinson 1983;Hoffmeister and Schendel 1986) consistently revealed smaller myelinated nerve fibers than those reported here for human premolars. However, Hirvonen (1987) reported an average circumference of 12.5 gm for myelinated nerves in the dog's canine teeth, which is more consistent with the human data presented in this study.…”

Section: Discussionmentioning

confidence: 94%

“…Available data relate to e.g., anterior teeth of cats (Johnson and Karlsson 1974;Beasley and Holland 1978;Fried and Hildebrand 1981;Holland and Robinson 1983;Noga and Correspondence to: P.N.R. Nair , dogs (Graf and Hjelmquist 1955;Hirvonen 1987), bovines (Graf and Hjelmquist 1955) and marmoset monkeys (Bueltmann et al 1972). Hoffmeister and Schendel (1986) reported the number of toothnerves entering mandibular teeth (incisors, canines, premolars and molars) of one cat.…”

Section: Introductionmentioning

confidence: 99%

Number and size-spectra of myelinated nerve fibers of human premolars

1992

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The primary objective of this study was to determine the number and size of myelinated nerve fibers at the subcervical, midroot and juxta-apical levels of human premolars. Sixty-seven healthy premolars extracted from adolescents were utilized. Root-discs were prepared from the three sites and processed for light and electron microscopy. The myelinated nerve fibers were counted from semithin sections using a sampling microscope. The measurements were taken from composite electron micrographs using an electronic image processing unit. A total of 1883 myelinated axons from seven mandibular second premolars was gauged. The 67 teeth had an average of 312 +/- 149 myelinated nerve fibers at the juxta-apical level (range 18 to 728). The contra- and ipsilateral differences in means among the four groups of premolars were not significant (P > 0.05). The number of nerves increased significantly (P< 0.05) toward midroot and subcervical (P < 0.001) levels in all groups. The average neural diameter was 3.5 + 1.0 microns at the juxta-apical level, and the between-teeth difference in mean was found to be significant (P < 0.01). There was no decline (P > 0.05) in the diameter of myelinated nerve fibers toward midroot and subcervical levels.

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“…Although the presence of myelinated and non-myelinated fibres has R N. R. Nair (~) 9 H. E. Schroeder Institute of Oral Structural Biology, Centre for Dental and Oral Medicine and Maxillofacial Surgery, University of Zurich, Plattenstrasse 11, CH-8028 Zurich, Switzerland long been established in mammalian teeth (Matthews et al 1959;Uchizono and Homma 1959;Miyoshi et al 1966), quantitative morphological studies on various classes of pulpal nerve fibres are rare. The available data relate mostly to rodent (Naftel et al 1994), feline (Johnsen and Karlsson 1974;Beasley and Holland 1978;Fried and Hildebrand 1981;Holland and Robinson 1983;Noga and Holland 1983;Hoffmeister and Schendel 1986), canine (Graf and Hjelmquist 1955;Hirvonen 1987), bovine (Graf and Hjelmquist 1955) and simian (Bueltmann et al 1972) teeth. Similar data on human intradental axons are scarce (Graf and Bj6rlin 1951;Johnsen and Johns 1978;Reader and Foreman 1981;Johnsen et al 1983).…”

Section: Introductionmentioning

confidence: 99%

Number and size spectra of non-myelinated axons of human premolars

Nair

Schroeder

1995

Anat Embryol

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The aim of this study was to determine the number and size of apical non-myelinated (C) axons of healthy human premolars. The material was derived from a large collection of specimens prepared for a previous quantitative investigation on the myelinated (A) axons of human premolars. A total of 16 teeth (six maxillary first and five each of mandibular first and second premolars), removed from adolescents for orthodontic reasons, were used. Root discs of about 0.6 mm thickness were prepared at about 2 mm cervical to the root apex and processed for light and electron microscopy. The number of non-myelinated axons was determined by taking a total census of such fibres that could be identified and reconstructed by standardized composite electron micrographs from each root disc. The measurement of axons was done on a statistically representative sample of axons (n = 1810) using an electronic image processing unit. The 16 teeth had an average of 2000 +/- 1023 non-myelinated axons at the juxta-apical level (range 534-3912). The average diameter of the non-myelinated axons was found to be 0.5 +/- 0.4 microns (range 0.05-2.4 microns).

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Caliber spectra of dental nerves in dogs and cattle

Cited by 21 publications

References 3 publications

Some anatomical and electrophysiological properties of tooth‐pulp afferents in the cat.

Some anatomical and electrophysiological properties of tooth‐pulp afferents in the cat.

Number and size-spectra of myelinated nerve fibers of human premolars

Number and size spectra of non-myelinated axons of human premolars

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