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Biomedical subjects

C F Parkinson

Publications and source records attributed to C F Parkinson.

11 recordsLinked to original sources
PubMed1989

A comparative study between interactive television and traditional lecture course offerings for nursing students.

Nursing education of the future will be characterized by diverse teaching methods. New modalities will be tested and used to meet constraints on both teachers and students. Parkinson and Parkinson report on the use of interactive television as a medium of education for nursing students studying pathophysiology. They compare this method to the more traditional teacher lecture method with interesting results. While students may prefer the human interaction, the learning results may be equivalent when the alternative medium is used.

Education, Nursing, Associate↗
PubMed1982

Endodontic abutments and complete dentures.

In this in vitro study, 90% of maxillary single-rooted teeth, 89% of maxillary multirooted teeth, 82% of mandibular single-rooted teeth, and 92.5% of mandibular molars had root canals that terminated short of the radiographic root apex. dimensional variability was considerable. Mean measurements provide acceptable levels for underfilling canals and dictate generally applicable levels at which root canal fillings are best terminated. These measurements indicate that, when filling maxillary teeth and mandibular molars, the termination point of the filling should be approximately 0.89 mm short of the radiographic root apex. When filling mandibular single-rooted teeth, the terminal point of the filling material should be approximately 0.69 mm short of the radiographic root apex. Complete overdentures are a valuable alternative to extraction and conventional denture placement. The nonvital teeth that are used for stability, retention, preservation of alveolar bone, proprioception, and psychological support are of critical importance. Failure in endodontic selection and procedure immediately negates the concept of overdentures.

Adult↗
PubMed1978

Similarities in resorption patterns of maxillary and mandibular ridges.

The differences in the posterior arch widths between opposing maxillae and mandibles were studied in 100 edentulous denture-wearing patients. Panoramic radiographs of 67 of these patients were used to assess the percentage of mandibular height reduction from that considered present before extractions. Comparisons between posterior maxillary and mandibular arch widths, reductions in mandibular height, and edentulous age accompanied by denture wearing were made. The following conclusions emerged: 1. The mandible does not progressively widen as its opposing maxillae becomes narrower, nor does a progressive incremental increase occur in posterior maxillomandibular width relations with increased resorption or resorptive age. 2. The arch width of the mandible exceeds the arch width of the maxillae in the molar region by an average of 6 to 7 mm after sufficient resorption establisheds a definitive alveolar crest. This difference remains the same regardless of the amount of resorption or resorptive age. 3. The progressive and irreversible mandibular alveolar resorption rate is greatest in the earlier stages of edentulism and slows with loss of bone, longevity of edentulism, and attendant wearing of dentures.

Alveolar Process↗
PubMed1976

Excessive crown contours facilitate endemic plaque niches.

Facial and lingual surfaces of teeth restored with complete metal and porcelain-fused-to-metal crowns exhibited greater mean plaque accumulation than did the contralateral teeth. This cross-sectional study showed greater facial-lingual width and plaque indices for restored teeth than for natural or unrestored teeth. This relationship between plaque and excessive contours must not be considered wholly dependent and conclusive. The multifactorial phenomenon influencing plaque accumulation no doubt could contribute to the findings of this study. However, until demonstrated otherwise, the creation of artificial crown contours that are greater than natural tooth convexities must be considered another parameter promoting endemic plaque niches. Sound application of principles with respect to the form of teeth and supporting tissue can preclude contouring of restorations beneficial to the accumulation of dental plaque.

Crowns↗
PubMed1975

Phagocytosis of Mycoplasma salivarium by human polymorphonuclear leukocytes and monocytes.

Mycoplasmacial activity was exhibited by human peripheal blood leukocytes in the absence of detectable specific antiserum. After incubation of varying concentrations of Mycoplasma salivarium with leukocytes, changes in colony-forming units (CFU) of this species per millilter occurred. The most noticeable decrease in CFU per milliliter was then the incubation mixtures contained five mycoplasmas per leukocyte. At this ratio, the mycoplasmacial min of incubation. Continued incubation demonstrated a tenfold decrease in CFU per milliliter by 4 h. Electron micrographs of incubated mixtures of human leukocytes and M. salivarium showed this mycoplasma to be phagocytized by monocytes and neutrophils whenever mutual contact or pseudopodial formation occurred. The process was continuous. Numerous phagocytic vacuoles developed which contained multiple ingested microorganisms. After the cytoplasmic granules of the leukocytes fused with the phagocytic vacuole, the phagocytized mycoplasmas became disrupted and unrecognizable.

Adult↗
PubMed1975

Reactivity of mast cells to Mycoplasma salivarium.

Mice were sensitized to Mycoplasma salivarium and then challenged with heterologous and homologous antigens. The number of degranulating tissue mast cells was used to assess the degree of local tissue hyperactivity after antigenic challenge. Significant differences existed between homologous and heterologous antigenic challenges.

Animals↗