[Half a year as a visiting professor in oral surgery in the USA].
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Biomedical subjects
Publications and source records attributed to G Persson.
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In a 3-year review of 218 teeth with retrograde root filling with amalgam orCavit, the results obtained with the former proved significantly better than those obtained with the latter. The difference seemed to be due to a better obliteration of the canal by amalgam. The obliterating effect of amalgam probably eliminates the need for revision of incomplete othograde root filling, for example, in cases with a post in the root canal. Irrespective of type of filling materials, the results were less good in cases with marginal bone loss.
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In a cross-over study in 10 subjects, rapidly dissolving coated lithium carbonate tablets and medium-slow-release lithium sulphate tablets were compared. Both preparations were administered twice a day. They gave similar post-absorptive concentrations of lithium in plasma and similar standard deviations of these concentrations. The medium-slow-release tablets gave smaller increases of lithium in plasma, and postponed the absorption peaks. They also gave less interindividual variation of lithium in plasma during the first few hours after administration.
Side effects with coated, rapidly dissolving lithium carbonate tablets, medium-slow-release and slow release lithium sulphate tablets, all administered twice a day, were compared in a double-blind, cross-over study in 27 patients who had only used lithium carbonate tablets. The relation between medication and meals was not standardized. The repidly dissolving tablets and the medium-slow-release tablets had a similar tendency to produce side effects, while slow-release tablets more often produced purgative side effects than the other two preparations did.
The relation between lithium dose, lithium concentrations, and lithium gradients in plasma and the side effects tremor, nausea, abdominal pains, and loose bowels was studied in 19 subjects. Rapidly dissolving lithium carbonate tablets were used. Tremor was related to higher doses, to higher concentrations, and to higher gradients of lithium in plasma. Nausea was related to higher gradients. Abdominal pain and loose bowels showed no relation to doses, levels or gradients. Concentrations of lithium were dose-dependent, while gradients were relatively independent of dose.
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Forty-six outpatients with anxiety tension states took part in a study on the effects of anxiolytic drugs. After the first interview the subjects also filled in a questionnaire as to their expectations of treatment outcome (n=41) and their experience of the first consultation (n=42), and the doctors made a prognostic evaluation (n=46). The relations between these three factors and background variables as well as initial ratings and outcome as rated by the doctors at follow-up examinations after 2, 4, and 8 weeks were investigated. Expectations, experience, and prognosis were not related to each other. Less hopeful patients more often considered conflicts to be the exclusive cause of their disorder and they were rated higher on signs and on the variable difficulties in being with people. Patients with less favourable experience more often considered practical and economic difficulties to be a cause of their disorder. Single or divorced patients were more often judged to have a less favourable prognosis. More positive expectations and a favourable prognosis. More positive expectations and a favourable prognosis were to some extent related to a better outcome after 2 and 4 weeks and a favourable experience was to some extent related to a better outcome after 4 and 8 weeks.
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Nhe symptoms after surgical removal of 379 mandibular wisdom teeth when Xylocain-Exadrin 2% and Citanest-Octopressin 3% were used, were evaluated according to a three grade scale. The severity of the symptoms, which were mild and normal in 53% and severe in 47%, did not demonstrably vary with the type of anaesthetic agent used. The symptoms were, on the average, more severe among the women than among the men. The symptoms were correlated with the duration of the operation, which was most obvious in the men. For the men the frequency of symptoms also increased with age. In the men there was also a tendency to a correlation between dry socket and long duration of operation. It thus appeared as if only the men reacted in the way expected from a biologic point of view. The investigation also showed that Xylocain-Exadrin had a better anaesthetic and ischemic effect.
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