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Biomedical subjects

S Bernick

Publications and source records attributed to S Bernick.

At least 37 records · Page 2Linked to original sources
PubMed1977

Lymphatic vessels of the human dental pulp.

Noncarious teeth obtained from individuals 15 to 50 years of age were used to study the lymphatic drainage of the human pulp. Thick sections (50 to 150 microns) were stained with iron hematoxylin for the demonstration of lymph and blood vessels. Lymph capillaries originated as blind sacs in the odontoblastic layer and in the pulp proper near the pulpo-odontoblastic border. They drained into small thin-walled collecting vessels that were irregular in shape and showed great variability in their drainage patterns. Communications between these vessels were very common. The larger conducting lymphatic vessels accompanied the blood vessels and nerves in their course through the pulp. They could be identified by their thin walls and small size. The large caliber lymphatic vessels contained valves, a structure not present in the veins of the same size. The conducting lymphatic vessels passed through the roots as individual units without draining into a large single vessel. The lymphatic vessels of the human pulp must be considered as a pathway for the removal of excessive tissue fluid in normal and diseased pulps.

Adolescent↗
PubMed1977

Morphological changes in lymphatic vessels in pulpal inflammation.

Noncarious, carious, and restored human teeth obtained from individuals 20 to 65 years of age were used to study the differences in lymphatic drainage between healthy and inflamed pulps. In carious teeth, the lymphatic vessels located within and/or surrounding the inflammatory lesion were distended, a situation not demonstrable in pulps of noncarious and restored teeth.

Adult↗
PubMed1977

The intraosseous orientation of the alveolar component of marmoset alveolodental fibers.

Sections of the jaws from marmosets of all ages were impregnated with silver nitrate to demonstrate the intrabony course of the alveolar fibers of the periodontal ligament. As the interseptal bone undergoes a period of resorption and apposition, the intrabony alveolar fibers also are lost and reformed. Age changes were noted in the insertion depth of the alveolar fibers. A continuum of fibers traversing the alveolar septum could not be determined.

Age Factors↗
PubMed1976

The development and maturation of the supracrestal fibers in nonhuman primates.

The transseptal fibers appear to develop independently in adjacent teeth and course toward each other meeting at the midline. Correction of rotations should be accomplished if possible before the teeth are in clinical occlusion. The thickness of the band of transeptal fibers depends on the anatomy of the interproximal space. The fibers are not continuous but interlace at the midline. In disease the transseptal fibers are destroyed first at the midline and appear to reorganize at that point. A thick fiber bundle was demonstrated to run buccolingually in the interdental space which served to connect the buccal and lingual gingiva. It was independent of the dentogingival fibersfibers. Circumferential fibers which extend from the interproximal to the labial and lingual gingiva were also noted. Poor hygiene which contributes to the formation of gingivitis and in extreme cases periodontitis causes the lysing of the gingival fibers. This study does not answer the problem of why certain rotations reoccur even after surgical transsection of the fibers. Further morphologic studies in a time sequence during rotation correction and retention are needed to determine which fibers play an exact role in the rotational relapse phenomenon.

Animals↗
PubMed1975

Effect of age upon the thyroid gland and pituitary thyrotrophs of the rat.

Male and female rats ranging in age from birth to 26 months, were used to study age changes in the rat thyroid and pituitary thyrotrophs. The thyroid follicular cells were cuboidal in shape until 10 mo. of age. Between 10-15 mo. the follicular cells became columnar in shape and contained intracellular colloid droplets. After 15 mo. the gland appeared mixed and consisted of both dilated follicles lined with flattened epithelium and hyperplastic follicles. The pituitary thyrotrophs were not demonstrable at birth but were visible at weaning. The size of the thyrotrophs correlated with the morphological status of the thyroid. Cytoplasmic vacuoles were first evident at 10 mo. and became more prominent as age progressed. The presence of large vacuolated thyrotrophs appeared to be related to the senile hyperplastic thyroid. No sex differences were noted.

Aging↗