Biomedical subjects

K Eichner

Publications and source records attributed to K Eichner.

At least 19 recordsLinked to original sources

PubMed1994

[Chemiluminescence method for the detection of radiation-induced oxidation products in fat-containing foods].

Radiation-induced oxidation of fatty foods was detected by a chemiluminescence method. Hazelnuts, peanuts and poultry were used as foodstuff samples. Additional investigations were performed with a model system and sunflower oil. The irradiation of the samples was carried out in a x-ray-fluorescence-apparatus. Thereby it is to note that the G-value of the x-ray-radiation is much higher than the G-value of a cobalt-60-source normally used for irradiation of food. A dependence of the integral of the light curve on the irradiation doses could be proved. Investigations with model systems which contained different amounts of alpha-tocopherol showed a decreasing chemiluminescence signal at low irradiation doses in presence of alpha-tocopherol. At higher doses the chemiluminescence signal enlarges with increasing amounts of alpha-tocopherol because irradiation products of alpha-tocopherol overlay its antioxidative effect. Irradiated poultry samples differ significantly from unirradiated samples after a deep-freeze storage of 26 weeks. A quantification of the doses is not possible without knowledge of the storage time, because the integrals decrease differently after irradiation during storage. In any case the chemiluminescence method is useful as a "screening method" for the detection of irradiation of foodstuffs with the possibility of automation and high sensitivity.

Animals↗

PubMed1994

[Study of the atrophy of the jaws].

Examining 230 edentulous patients, a significant degree of atrophy in the maxilla and mandible relatively often has been found. Atrophy could be detected more often in the mandible of female patients. For these forms of manifestation, among others, systemic causes: osteoporosis, diabetes and periodontal disease could be found. The results and their classification may help to draw the attention in the course of treatment to strong dissimilarities or similarities of the edentulous mouth. The degree of atrophy observed on both jaw-bones--among other factors--is significant for the planning and prognosis when indicating total prosthetic treatment.

Adult↗

PubMed1991

[Formation of IQ-compounds in meat and meat products].

During meat processing mutagenic imidazoquinolines and imidazoquinoxalines ("IQ-compounds") may be formed by Maillard reaction of reducing sugars, amino acids, and creatine/creatinine. IQ-compounds isolated from low-moisture model systems and meat extract by liquid-liquid-distribution were fractionated on a cation exchanger and separated on an RP phase. After acetylation the separated compounds were identified by gas chromatography/mass spectrometry based on their characteristic mass fragment ions. During heating the model systems at 100 degrees C the formation of IQ-compounds begins and greatly increases by further raising the temperature. In different amounts IQ-compounds could also be detected in commercially available meat extracts.

Amino Acids↗

PubMed1990

[Metal alloys for ceramic veneering and special methods of handling precious-, palladium- and non-precious alloys].

Out of the great number of very important investigations on metal ceramics, only a small section can be represented. Those precious metal alloys which were developed for metal ceramics 25 years ago, were able to create and body confidence in the new ceramic proceedings of production for crowns and bridges. The number of failure caused by cracking and bursting was of a minor kind. The necessity of having cheaper alloys at one's disposal, e.g. gold-reduced alloys, palladium-alloys and non-precious metal alloys, involved that investigations for locating mistakes in the ceramics were carried through. Afterwards, changes of working methods had to be tested, in order to eliminate bubbles and cracks. The demonstrated results are designed to achieve better crowns and bridges. Allbountiful instructions are not possible, however, each alloy and each ceramic mass requires a special method of handling. If this happens, metal ceramics should continue to be a valuable clinically practicable method.

Dental Alloys↗

PubMed1990

[Renewed examination of the group classification of partially edentulous arches by Eichner and application advices for studies on morbidity statistics].

The groups A1 to C3 of the "group classification of partially edentulous arches" by Eichner are characterized by the number of teeth and the topography of the natural dentition. This could be demonstrated in a clinical study on 1000 patients prepared by Blume-Gréger. The result shows a percentage of 49.5 in the groups A, 22.4% in the B-groups and 28.1% in the C-groups. Furthermore, these groups represent the course of tooth loss also regarding the functional value of the natural dentition. Thus, this classification provides a standard for the degree of morbidity of the dentition and is suitable for application in studies on morbidity statistics. When used for documentation files there is an error possibility of 1.9%.

Adult↗

PubMed1989

[Crown margins and periodontium].

This review is based on an extensive study of the literature, various investigations of clinical and dental materials, experience as well as long-term observations. Our understanding of the behavior of the gingiva at the margins of artificial crowns has been widely extended within the last two decades. Some of these findings are discussed. However, complete absence of inflammation at the gingival margins can hardly ever be expected. What is usually present is rather "an acceptable state of marginal periodontitis" (Ketterl). Continuous and deliberate oral hygiene on the part of the patients is a decisive prerequisite for an acceptable oral condition.

Crowns↗

PubMed1988