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Biomedical subjects

M Juhl

Publications and source records attributed to M Juhl.

At least 37 records · Page 2Linked to original sources
PubMed1988

Oil and petrol drum explosions. Injuries and casualties by exploding oil and petrol drums containing various inflammable liquids.

If ignited, an evaporated inflammable liquid remaining mixed with air in an oil or petrol drum may cause an explosion in which the top and bottom of the drum are blown off by the blast and act as projectiles causing extensive injuries to persons nearby. To analyse the occurrence of this type of accident and to study the injuries involved information was sought from all police districts in Denmark and all the departments of plastic surgery with a burns unit. The investigation revealed a total of 21 accidents caused by oil drum explosions over a period of 36 years with 16 injured within the last 5 years in a population of five million people. Fifteen accidents occurred during attempts to divide a drum with a disc grinder or a cutting blow-torch; five of the victims were welding drums or using drums as a support when welding or cleaning iron materials and one man was shifting a drum which exploded because of the heat of the sun. Five men were killed: three died from burns and two from fatal brain injuries. Two men with several facial fractures survived. Five victims received injuries to the lower limb and presented with a total of six open, comminuted fractures of the tibia. Nine men had burns covering from 2 to 50 per cent of the body surface, up to 30 per cent of the burns being full-thickness. This paper draws attention to the extreme danger of working on apparently empty oil or petrol drums with tools generating heat or sparks, unless specific precautions are taken.

Accidents, Occupational↗
PubMed1988

Distribution of Langerhans cells in clinically healthy human gingival epithelium with special emphasis on junctional epithelium.

Twenty-one biopsies of clinically healthy marginal gingiva from children, who performed conventional oral hygiene but received no additional professional prophylaxis, were studied in order to obtain information on distribution and density of Langerhans cells (LC) in the oral gingival epithelium (OGE), the sulcular epithelium (SE) and the junctional epithelium (JE). A simple freeze-separation technique was found to create acceptable histomorphology of JE in specimens obtained adherent to teeth, while partially and non-adherent ones were rejected. The majority of LC in OGE were highly dendritic and stained intensively with OKT6 monoclonal antibodies. The distribution was network-like with a density of 21.0 +/- 3.2 LC/0.1 mm2 cross-sectional epithelial area. A similar although less dense distribution was found in SE (8.6 +/- 3.0 LC/0.1 mm2). These observations confirm previous findings. In JE 2 groups of LC were identified: 1) Weakly stained LC with very few and short dendrites distributed in a scattered way (2.8 +/- 1.4 LC/0.1 mm2) in the apical three-fourths of JE in most specimens. Present evidence suggests that these cells might be immature cells of Langerhans lineage. 2) Clusters of LC (9.4 +/- 2.9 LC/0.1 mm2) with dendrites of moderate lengths and numbers and a varied fluorescence intensity; they were found in a few specimens in the coronal one-fourth of JE and at the border zone to SE. Such clusters might represent genuine variation in the distribution of LC or reactions to initial/early plaque formation.

Adolescent↗
PubMed1987

Simultaneous dislocation of the interphalangeal joint of the thumb and the carpal lunate.

A dislocation of the interphalangeal joint of a thumb was treated without problems. The simultaneous dislocation of the lunate was not diagnosed or treated until the plaster cast was removed. Even in cases with an obvious lesion like a finger joint dislocation it is necessary to investigate all other fingers and the wrist to exclude other lesions and to avoid delay in treatment.

Adult↗
PubMed1986

Arthroscopy in children, with special emphasis on meniscal lesions.

Seventy-six children under 16 years of age (mean age 14.5) underwent diagnostic arthroscopy of the knee. Seventeen were examined under local anaesthesia as outpatients. The referring doctors suspected a meniscal lesion in 25 cases, but in only 6 of these was the diagnosis confirmed. The surgeon's diagnosis was verified in 9 out of 31 cases; unsuspected lesions of both menisci in one knee make a total of 10 patients with meniscal lesions (10 knees, 11 menisci). The most frequent lesion found was rupture of the anterior cruciate ligament (12). Because of the arthroscopy, three minor meniscal lesions could be observed without treatment, and no menisci were totally removed. In two cases an arthrotomy would have been done on the wrong side of the knee if the operation had not been preceded by arthroscopy. Fifteen arthroscopic operations were done but only three for meniscal lesions.

Arthroscopy↗
PubMed1986

Os penis of the rat. V. The distal cartilage process.

The morphogenesis and morphology of the distally positioned cartilage of the os penis, the processus cartilagineus, are described in rats aged from 1 to 100 days. Based on observations of metachromacy of the process stained with toluidine blue it was found that a processus cartilagineus only exists in the period between 35 and 50 days of age. Before 35 days, the structure consists of connective tissue proper, and after 50 days the cartilage starts to calcify partially. The present paper also initiates studies of experimentally caused alterations of the normal development of the processus cartilagineus by subjecting 35-day-old rats to castration, with subsequent sacrifice at 100 days. Castration at that age causes a complete interruption of normal development of the processus cartilagineus as the structure in 100-day-old castrated rats has distinct morphological characteristics in common with those of 35-day-old normal rats. The present paper, thus, confirms that normal development of the processus cartilagineus seems to be male-hormone-dependent.

Aging↗
PubMed1983

Three-dimensional replicas of pit and fissure morphology in human teeth.

Nuva Seal replicas of pits and fissures from surgically removed unerupted human third molars and premolars, and from erupted premolars extracted for orthodontic reasons, were examined in the scanning electron microscope. The results confirm that the morphology on occlusal surfaces of third molars is extremely variable with numerous pits of considerable length positioned at various angles relative to the fissures. In contrast, the morphology of unerupted and erupted premolars is simpler with fewer and shorter pits positioned perpendicular to the fissure. It is pointed out that fine details of the morphology are lost when reconstructions of the occlusal morphology are made from serial ground sections. However, such reconstructions seem to be less reliable in third molars than in premolars.

Bicuspid↗