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Biomedical subjects

R J Nicholson

Publications and source records attributed to R J Nicholson.

7 recordsLinked to original sources
PubMed1978

Human blood pressure and pulse rate response to racemic epinephrine retraction cord.

1. The pulse rate of patients after application of racemic epinephrine-impregnated retraction cords depends more on the level of anxiety and stress than on the level of the epinephrine. 2. Blood pressure is elevated by placement of racemic epinephrine-impregnated retraction cords upon an exposed vascular bed or lacerated tissue. 3. Four percent racemic epinephrine-impregnated retraction cords cause less elevation of blood pressure than 8% racemic epinephrine cords. 4. Although the elevations in blood pressure from 8% cord occur within a narrow range, this range may be hazardous to cardiac patients. Therefore, 4% racemic epinephrine cord should be used. 5. A desirable amount of tissue retraction is produced by 4% racemic epinephrine cord. 6. Dry cords do not provide adequate retraction of tissue and are contraindicated for tissue-retraction purposes.

Adult↗
PubMed1976

Direct and indirect pulp capping.

Cavity disinfection, indirect pulp capping, and direct pulp capping have been discussed in light of present day knowledge of the biology of the pulp. A format has been presented to the restorative dentist which has had long-standing clinical acceptance based on some scientific data and clinical evidence to substantiate the treatment radionale.

Calcium Hydroxide↗
PubMed1975

Comparison of tissue response between a synthetic gutta-percha and a natural gutta-percha endodontic filler.

Biologic acceptance is one of several criteria that must be met by an endodontic filling material. The purpose fo this experiment was to compare a new filling material consisting of a synthetic gutta-percha with a standard material consisting of natural gutta-percha. Each sample, being an endodontic point, contained a quantity of fillers. The materials were implanted subcutaneously in male white rats. The histologic appearance was essentially identical for both materials.

Animals↗