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Biomedical subjects

G Kluge

Publications and source records attributed to G Kluge.

At least 19 recordsLinked to original sources
PubMed2007

[Osteodensitometry in children and adolescents with inflammatory bowel disease].

PURPOSE: To evaluate the quantity and severity of bone disorders in children and adolescents with inflammatory bowel diseases (IBD) and to examine the correlation to whole body growth. MATERIALS AND METHODS: In this study 89 bone mineral density measurements were performed and retrospectively analyzed. RESULTS: Under consideration of growth retardation, over 65.2 % of the patients with Cohn's disease showed a reduced bone mineral density. Osteopenia/Osteoporosis is seldom seen in patients with ulcerative colitis, i. e., only 34.8 % showed a reduction in bone mineral density. Growth retardation and reduced bone mineral density are correlated. Patients with Cohn's disease and a body length below the 25th height percentile showed a reduced bone mineral density in 78.1 % of the cases. Patients with a body length below the 10th height percentile had a reduced bone mineral density in 83.3 % of the cases. CONCLUSION: These results demonstrate the value of osteodensitometric measurements in patients with chronic diseases, especially in children and adolescents with inflammatory bowel disease.

Absorptiometry, Photon↗
PubMed1993

[Enamel damage depending on the method of bracket removal].

Two different methods of removing brackets, on the one side by torsion and on the other by bending, were compared for the purpose of analyzing the respective enamel lesions. Each test group consisted of 19 extracted human molars with metal brackets attached to the molars by means of the "concise etching technique". Bracket removal was standardized through the use of a Wolpert "Universalprüfmaschine TZZ 707" with modified torsion and bending mechanism. A scanning electron microscope was used to analyze the enamel surface. When using the torsion method, the mean extension of the enamel lesions was 48.3% of the adhesive free enamel surface. These lesions often reached into the deeper enamel layers and were mainly to be found on the broad side of the bonded area. On the other hand, when using the bending method, the enamel lesions were less frequent. They were mainly superficial and were confined almost exclusively to the pressure zones. The stress required to remove the brackets and the stress distribution were calculated on mechanical models and these results corresponded well with the enamel lesions observed on the molars. It can thus be concluded that the method of removing brackets is clinically relevant in relation to enamel lesions.

Dental Debonding↗
PubMed1992

The influence of occupational and non-occupational factors on chronic fatigue in women.

The aim of the present study was to assess the significance of different types of loads to which working women are subjected in relation to reported chronic fatigue. The investigation involved 255 women workers from two different occupational groups. The first group was employed at knitting and the second at assembly lines. Their level of chronic fatigue was assessed. We also analysed the influence of 30 variables on fatigue level. These variables concerned: a) physical and psychological workload, b) organizational (social) climate of work, and c) demographic and family factors. It was found that the most important factor influencing chronic fatigue was "experiencing emotional tension" resulting from family problems. Other factors, having substantial significance for the development of increased fatigue level were also associated with emotional tension and resulted from the social climate in the workplace.

Adult↗
PubMed1992

[The effect of the interocclusal space on temporomandibular recordings. A study with the use of the Stereognathograph PC].

1536 recordings of the condylar movement of 32 patients were made by means of the Stereognathograph PC. The test persons performed mediotrusive and protrusive movements. These movements were recorded with tooth contact and with increased interocclusal space, with and without the clinician's supportive guidance. The objective of the study was to analyse the effects of increased interocclusal space on the recording of the condylar path. Statistical evaluation showed that neither procedure has any real advantage over the other. Both, the occlusal tray as well as the paraocclusal tray may, depending on clinical situation of the ligaments, lead to erroneous recordings. The reproducibility of the recording of the condylar path is only slightly decreased by increased interocclusal space. Considering, however, the amount of work involved in each procedure, the occlusally fixated tray should probably be given preference, when there is no intention of recording occlusal guided movements.

Adult↗
PubMed1992

[The stereognathograph PC--test results with the new version of the device].

The PC stereognathograph was investigated for measurement errors in laboratory experiments on an optical bench as well as on an articulator. The values obtained were compared with the data of the predecessor model. A substantial reduction in the linearity in transverse measurements has been effected, so that these are now within acceptable limits. A variation of linearity factors which can be avoided by electronic fine adjustment still arises owing to incongruence of the six measurement channels. The hinge axis can be localized very well on the articulator. By and large, the announced correction of the projection error which we have demanded has not been implemented up to now. In view of the clear imaging of condylar movement in space and time on the monitor and the adequate precision of the clinical measurements effected, the PC stereognathograph appears to be a valuable system for instrumental diagnostics.

Dental Articulators↗
PubMed1991

[Effect of different enamel structures on bonding of glass ionomer cements].

In the present study, the adhesive strength of glass-ionomer cement (GIC) for bracket bonding is analysed in relation to the surface characteristics of the enamel. The bonding of brackets to the enamel of impacted teeth as well as erupted teeth of adolescents and adults is determined in shear force experiments. The results of our investigation shows that GIC attaches to adult enamel to a significantly better extent than to the teeth of adolescents. The poorest values were shown in impacted teeth. It is shown with reference to scanning electron micrograms that surface lesions occur especially frequently in use of conventional etching technique on enamel in adults after debonding the bracket. GIC thus appears to be a promising alternative material for bracket fixation which does not damage the enamel, especially in adult orthodontics. In view of the result, its suitability should be checked in clinical studies.

Acid Etching, Dental↗
PubMed1991

[Fluorine distribution in the enamel in the use of glass ionomer cements as bonding materials].

The rise in the fluorine content of dental enamel after bonding orthodontic attachments with glass ionomer cement (GIC) was analysed in an in vitro study. Twenty-four freshly extracted caries-free premolars from adolescent patients were available for investigation. The teeth were cleaved longitudinally in the oro-vestibular direction to obtain a test specimen and reference sample. The GIC Aquacem was used as bonding material. The fluorine was measured with an electron beam microprobe (Camebax SX 50) 10, 20, 40 and 80 days after bonding. A rise of fluorine in dental enamel of more than 120% was observed after the bonding procedure. This rise was especially rapid in the first ten days, and a saturation value was reached after 40 days. The depth of penetration into the dental enamel was 20 microns, and the surface spreading was at least 3 mm. An equilibrium state is attained between the 40th and 80th day. A preventive action on caries in the vicinity of attachments bonded with glass ionomer cement is to be expected owing to the accumulation of fluorine in the dental enamel.

Adolescent↗
PubMed1990

[Reproducibility of hinge axis localization by stereognathography].

The program of the Stereognathograph V for localization of the hinge axis has been experimentally verified. Auxiliary recording devices have been mounted on an articulator and the process of localization has been simulated. On an average, the joint axis can be located in the articulator with an accuracy of 0.6 mm. In individual cases, errors may be up to 1.5 mm.

Dental Articulators↗
PubMed1990

[Linearity and error correction of the Meyer/dal Ri hinge axis measurement system].

Measurement errors inherently related to the instrument and those due to external factors were analysed for the SAS hinge axis measurement system in conjunction with the digital recording system. An optical bench served as measurement apparatus. Linearity errors are substantially less than 0.1 mm and thus of no clinical relevance. A slight reduction in the size of the movement coordinates imaged with slight incongruences of the six measurement canals results from erroneous calibration. The recording system proves to be insusceptible to interference by external factors in practical application. The projection error correction we investigated experimentally was satisfactory. Merely the processing quality of the electrical wiring attached to the measuring foils was not fully satisfactory.

Dental Articulators↗
PubMed1989

[Error sources in recording three-dimensional mandibular movements. An in vitro study using the V-type stereognathograph].

The instrument-induced measurement errors in V-type stereognatography have been analyzed. An optical bench was used as a measurement apparatus. In measuring not too small movement distances, the linearity errors remained within acceptable limits. The variations in linearity due to calibration errors were almost negligible. In practical applications, the stereognatography proved to be insensitive to external factors such as type of illumination, room temperature and voltage fluctuations. Factors affecting the effectiveness of the projection error correction system, such as tilting of the filter, different sites of measurement of the six optoelectronic canals, and mandibular protrusion during mediotrusive movements, might be reduced by slight modifications of the measurement system.

Cephalometry↗
PubMed1987

[Fatigue in women performing work with predominantly dynamic effort. II. The social working environment and the feeling of fatigue].

The relations between the sense of fatigue and evaluation of social factors demonstrated in the so called organizational climate of a workplace have been investigated. The test groups involved women performing major knitting industry jobs: knitters (94 persons) and sorters (44 persons). A multiple regression analysis demonstrated numerous relationships between the subjective symptoms of fatigue and social climate indices (10 indices have been observed). Among the social factors, especially work organization and interpersonal relationships (among workers themselves and workers in relation to their managers) may affect the magnitude of fatigue in knitting industry-employed women.

Employee Grievances↗