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Biomedical subjects

K A Sämfors

Publications and source records attributed to K A Sämfors.

7 recordsLinked to original sources

Oral status and estimated treatment need in Swedish air force conscripts.

The oral status of a platoon of 53 air-force conscripts was investigated. Interviews on regularity of dental care, diet and oral hygiene habits were included. The estimated treatment need was analysed in terms of time required for treatment by dentist or auxiliaries, i.e. hygienist or preventive dental assistant. There was a high prevalence of dental plaque, gingivitis and caries. It was estimated that 16 hours of dentist time would be required for restorations, but no dentist time would be necessary for periodontal treatment. The total time needed for preventive dentistry was estimated at 61 hours of treatment by preventive dental assistants. Such epidemiological data are valuable for estimating prospective treatment needs in population groups and as indicators for needs-related dental manpower planning.

Aerospace Medicine↗

Elliptical narrow beam rotation radiography.

The basic mathematics for elliptical narrow beam rotation radiography are deduced and exemplified. An analysis of the functioning principle of elliptical systems shows that the essential factor in the image formation is the form of the evolute of the ellipse, which determines the projection of the object. The image layer does not necessarily coincide with the ellipse.

Health Physics↗

Form distortion in narrow beam rotation radiography.

The distortion of morphologic object elements, for distortion, at the exposure of a panoramic image has been determined mathematically and experimentally. As models the square, the circle, the rhomb, and the equilateral triangle were used. The general characteristics of the form distortion in narrow beam rotation radiography are analysed and described.

Humans↗