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Biomedical subjects

G Dietz

Publications and source records attributed to G Dietz.

At least 73 records · Page 4Linked to original sources
PubMed1979

[Structure of calf rotavirus. 1. Hydrodynamic and electron microscopic parameters of the virus].

Rotavirus was isolated from the faeces of calves afflicted with diarrhoea and purified. Isolation was preceded by chloroform treatment, oxide wax A-precipitation, as well as differential and density gradient centrifugation. Virus density in CsCl solution was 1.38 +/- 0.01 g/ml. Cell culture virus prepared without chloroform (Nebraska-type isolation) would be 1.37 +/- 0.01 g/ml in density, for comparison. The mean capsid diameters measured were 55 nm and 60 nm, sedimentation coefficents being between 450 and 478 S. The mean core diameter was 40 nm. Structure of capsid is discussed.

Animals↗
PubMed1979

[State of the dentition in 3--10 years old children in the Munich region].

A questionnaire was sent to the parents of 1000 3- to 7-year-old children in and around Munich whose teeth we had examined. We inquired as to the oral hygiene and the socioeconomic conditions. The def and DMF mean values were evaluated according to the age group. The results indicate that the condition of the teeth of our young people can only be improved if measures for dental hygiene and caries prophylaxis in general are intensified and improved at the kindergarten level.

Child↗
PubMed1978

[Experimental studies on the stress endurance of traumatized periodontium].

The reaction of intra-osseous fixed front teeth against defined forces was electronically registered as a distance-force function. The record was submitted to computer-assisted analysis. Comparison of the functions was made via the paramaters of algebraic definition. Analysis led to the submission that the resistance of tooth and tissues is primarily limited by the quality of the surrounding osseous tissue, which itself reacts in a rubber-elastic fashion.

Dental Implantation, Endosseous, Endodontic↗
PubMed1977

[Immunological diagnosis of filariosis in persons returning from tropical countries and in European and indigenous inhabitants of endemic areas (author's transl)].

Serum samples from persons who lived in areas where onchocerciasis occurred or who had filariasis were examined with the complement fixation test and the indirect hemagglutination test for the presence of antibodies against crude extracts from Dirofilaria immitis, Onchocerca volvulus, Dipetalonema viteae, and Ascaris suum. The results could be interpreted as follows: 1. The indirect hemagglutination test was more sensitive than the complement fixation test for the demonstration of antibodies in sera from European and indigenous inhabitants of endemic areas. 2. There were no differences between the responses to the four crude worm extracts among the groups of 21 patients with Loa loa, 12 patients with Onchocerca volvulus, 11 patients with Dipetalonema perstans, and 22 patients with clinical filariasis in whom no microfilaria had been found. It was concluded that the examination with crude extracts cannot give any information about the antigens that had caused the stimulation of antibodies.

Adolescent↗
PubMed1977

[Endosseous endodontic implantation in front teeth with horizontal fractures in the median third].

The recommendation to use pin implants as fixing elements in horizontally fractured roots of anterior teeth is based on our own animal experiments as well as on clinical and radiological examinations of six patients. The examinations were made in 14 anterior teeth fixed to the bone by a pin the roots of which had been reduced to about half the physiologic length by resorption, amputation or fracture. The original biomechanical situation was the same in all three types of root reduction. We observed the pin-fixed teeth for 2 1/2 years on the average.

Adolescent↗
PubMed1976

[Experimental horizontal fractures of front tooth roots and their endodontic endosseous pin fixation in monkeys].

Pathologically movable anteriors with horizontal root fracture can be fixed by endodontal bone pins, unless the fracture is located in the cervical third of the root canal. The apical root fragment needs to be removed for fixation. As the anatomic conditions in monkeys do not permit adequate preparation of the root canal required for endodontal pin fixation, the histological findings can be transferred to man to a limited extent only.

Animals↗
PubMed1975

[Apex and periapical periodontium of teeth with endodontic-endosseal pin fixation].

Teeth with endodontic-endosteal pin fixation were observed for several years and radiolucencies that could be interpreted as chronic inflammation, were found in the periapical region of these teeth. The cause is sought in the iatrogenic noxa of the originally applied method. It is recommended to expose the apex of teeth to be provided with endodontic-endosteal pin fixation and to shorten the apex by grinding off 2-3 mm.

Dental Implantation, Endosseous, Endodontic↗
PubMed1975

[Endodontic-endosseal fixation and capping pin].

For improving the endodontic-endosteal fixation method, an endodontic-endosteal fixing and capping pin was developed after six years of experience. Its form and adaptability to the widened root canal permits succesful fixation via the canal in a single session with only little technical means. At the same time the pin with its cap enables permanent anchorage of the crown.

Crowns↗
PubMed1975

[Immunodiagnostic tests for bilharziasis. IV. Demonstration of antibody in blood and serum eluates collected on filter paper discs (author's transl)].

Serum and blood samples dried on filter paper discs and normal sera were collected from 142 Liberians with proven schistosomiasis and 25 Liberians without schistosomiasis. These samples were tested by the indirect hemagglutination test (IHA) employing lyophilized sheep erythrocytes sensitized with either cercarial or adult Schistosoma mansoni antigens. The following results were obtained: Out of the 142 sera collected from the schistosomiasis patients 130 (91.5%) reacted with the cercarial antigen and only 89 (62.6%) reacted with the adult S. mansoni antigen. None of the 25 sera from persons free of schistosomiasis reacted with either antigen. The sensitized lyophilized erythrocytes showed no loss of antibody activity after laboratory storage at 4 degrees C for 4 months which was interrupted twice for 16 hours each during shipment. Filter paper serum and blood samples were stored at -25 degrees C up to 84 days with 16 hours interruption during shipment. 77.6% of the eluates from blood showed the same antibody titer levels as in normal serum; 10% showed lower antibody titers and 11.5% had negative results compared with normal serum. Results obtained with eluates from dried serum were somewhat better. An additional storage of the dried blood specimens for ten days at room temperature resulted in a rise of the proportion of negative titers from 11.5% to 34.1%. This loss of antibody activity was found in two thirds of the samples with low antibody titers. The results indicate that blood and serum samples dried on filter paper platelets should be stored at low temperatures (-25 degrees C) to preserve the antibody response.

Animals↗