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  • 1
    Digitale Medien
    Digitale Medien
    Electrical properties of MgO insulating layers in spin-dependent tunneling junctions using Fe3O4 (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 4768-4771 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We investigated the growth conditions and electrical properties of MgO epitaxial thin films, which have potential applications as insulating layers for spin-dependent tunneling devices where Fe3O4 serves as one of the magnetic electrodes. Our investigation showed that epitaxial MgO films with high crystalline quality can be successfully grown at temperatures as low as 473 K in oxygen pressures less than 1×10−5 Torr. This is a very important result because it indicates that the oxidation of the underlying Fe3O4 electrode is not a factor in fabrication of spin-dependent tunneling devices. We also examined the electron tunneling properties of Au/MgO/Fe3O4 junction with an ultrathin MgO layer prepared under the conditions described above and found excellent electron tunneling properties, as will be discussed. Barrier height and thickness estimated by curve fitting current density–voltage curves using the Simmons equation yielded barrier height and thicknesses of 0.9 eV and 2.5 nm, respectively. These values were consistent with those estimated by taking into account the reduction of the barrier height due to image forces. These results indicate that the MgO insulating layers grown under the restricted conditions have satisfactory electrical qualities required for spin tunneling devices. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1312845
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  • 2
    Digitale Medien
    Digitale Medien
    Finite element analysis of the effect of the bucco-lingual position of artificial posterior teeth under occlusal force on the denture supporting bone of the edentulous patient (2003)
    Oxford, UK : Blackwell Science Ltd
    Journal of oral rehabilitation 30 (2003), S. 0 
    Details
    ISSN: 1365-2842
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: summary  To improve the quality of the complete denture prosthesis, the bucco-lingual position of the artificial posterior teeth must be determined with consideration of the shape of the maxillary and mandibular residual ridge and the relationship between them. The arrangement of posterior artificial teeth should be considered not only for the denture stability but also for the avoidance of high pressure on the supporting structures. A two-dimensional finite element method program to investigate the statics for the contour of the complete denture and the residual ridge was developed. With this program, the effect of the bucco-lingual position of the artificial posterior teeth under occlusal force on the denture supporting bone could be investigated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-2842.2003.01110.x
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  • 3
    Digitale Medien
    Digitale Medien
    The effect of diabetes mellitus on histopathological changes in the tissues under denture base bearing masticatory pressure (1999)
    Oxford, UK : Blackwell Science Ltd
    Journal of oral rehabilitation 26 (1999), S. 0 
    Details
    ISSN: 1365-2842
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: The effect of streptozotocin-induced diabetes mellitus on histopathological changes in tissues bearing masticatory pressure exerted through an experimental denture base has been studied in animal specimens. Experimental dentures, which prescribed the masticatory pressure by the amount of subsidence of the denture base (100, 50 or 13 μm), were constructed for the hard palate of the molar regions of rats. It was revealed that streptozotocin-induced diabetes mellitus (1) weakened the intercellular junctions in the epithelium and gradually enhanced this state with time, (2) lessened the atrophic and proliferative reactions in the epithelial ridge and prolonged their appearance period, (3) enhanced the compression of lamina propria mucosae and prolonged the appearance period of this reaction, (4) enhanced the inflammatory change and extended its appearance period, (5) lowered the threshold for the inflammatory reaction induced by the masticatory pressure, (6) increased the number of osteoclasts and prolonged the period of their presence, (7) lowered the threshold for osteoclastic bone resorption induced by the masticatory pressure, (8) inhibited the appearance of osteoblasts following the disappearance of osteoclasts and (9) accelerated the decline rate of masticatory pressure exerted to the denture supporting tissues. Therefore, it can be concluded that the streptozotocin-induced diabetes mellitus in the animals tested deteriorated the tolerance of the denture supporting tissues to masticatory pressure.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-2842.1999.00367.x
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  • 4
    Digitale Medien
    Digitale Medien
    Accelerated DNA fragmentation of the denture-bearing mucosal epithelium in an animal model of diabetes (2001)
    Oxford UK : Blackwell Science Ltd
    Journal of oral rehabilitation 28 (2001), S. 0 
    Details
    ISSN: 1365-2842
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: This study examined the effect of masticatory pressure transmitted directly to the hard palate mucosa on the final stage of terminal differentiation of keratinizing system of rats with and without streptozotocin-induced diabetes mellitus. In the nondiabetic rats with masticatory pressure, the number of terminal-deoxynucleotidyl-transferase-mediated deoxyuridine-triphospate-biotin nick end labelling (TUNEL) positive cells tended to increase about twice as much as in the nondiabetic rats without pressure with and without denture. A similar tendency of increase was observed in the diabetic rats without pressure. The synergy of the mechanical pressure and diabetic condition for 2 weeks greatly accelerated the DNA fragmentation, showing 8-fold increase in TUNEL positive cells over the normal control, and caused exfoliation of the stratum corneum. A 4-week exposure of diabetics to the masticatory pressure induced laminar splitting in the midst of the spinosum. Some cells in the stratum granulosum exhibited a sign of DNA fragmentation when laminar splitting took place in the vital cell layer. Premature DNA fragmentation may disturb the adhesion between spinosum cells and prevent the maturation of stratum corneum. Increase in Bax protein-like immunoreactivity in these epithelial cells as revealed by immunocytochemistry may underlie the premature DNA fragmentation in the oral masticatory epithelium under pressure in diabetic patients.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-2842.2001.00674.x
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  • 5
    Digitale Medien
    Digitale Medien
    Visual observation of the dynamic flow of elastomer rubber impression material between the impression tray and oral mucosa while seating the impression tray (2003)
    Oxford, UK : Blackwell Science Ltd
    Journal of oral rehabilitation 30 (2003), S. 0 
    Details
    ISSN: 1365-2842
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: summary  The purpose of this study was to inspect visually, the dynamics of the impression flow at seating of the impression tray. The effects of the relief and the escape hole of the impression tray on the impression flow were also examined. Three types of the transparent impression tray (flat tray, relief tray and escape hole tray) were prepared. Transparent silicone polymer was put on the impression tray surface. Four drops of the dark blue silicone impression material was injected into the transparent silicone polymer on the impression tray. The impression tray was seated on the model of the denture-supporting mucosa. The movement of the four drops caused by the impression flow was visually recorded with the video camera and examined. The result for the flat tray showed that the impression material moved from inside to the outside. It was also shown that the speed of the moved impression material increased as the seating of the impression tray advanced. The results for the relief tray and the escape hole tray showed the effect of the relief and the escape hole prepared to the impression tray on the speed and the direction of the flow of the impression material.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-2842.2003.01056.x
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  • 6
    Digitale Medien
    Digitale Medien
    Galvanic skin response of oral cancer patients during speech (2003)
    Oxford, UK : Blackwell Science Ltd
    Journal of oral rehabilitation 30 (2003), S. 0 
    Details
    ISSN: 1365-2842
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: summary  Severe speech difficulty is often caused after surgery of an oral cancer. Prosthetic treatment with a removable obturator prosthesis is generally provided for such patients. Although some speech ability is recovered with prosthetic treatment, patients sometimes complain of continued dissatisfaction with their speech. However, it is difficult to evaluate the dissatisfaction. Therefore, a new method for evaluation is desirable. In this study, such a new method using the galvanic skin response as the index for the dissatisfaction of the patient was developed, and its objectivity was investigated. Eleven patients with maxillary bone defects were selected. Prior to the evaluation, improvement of speech with the removable prosthesis was confirmed using the speech intelligibility test and the visual analogue scale. The electrical resistant value at pronunciation was measured with the measuring system composed with the apparatus (galvanic skin response (GSR) measuring apparatus), the personal computer program. The changes for the electrical resistant value after pronunciation were evaluated by calculating the decrease ratio at pronunciation [(the mean electrical resistance before pronunciation − the mean electrical resistance after pronunciation)/the mean electrical resistance before pronunciation]. This decrease ratio at pronunciation was defined as the index of the speech dissatisfaction of the subject. The mean values for the decrease ratio with prosthesis were significantly smaller than the values without prosthesis (P 〈 0·05). From the results of this study, it is suggested that the measurement of the electrical resistance change of the skin during speech could be a new method for evaluating the speech dissatisfaction of the post-oral-cancer patient.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-2842.2003.01131.x
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  • 7
    Digitale Medien
    Digitale Medien
    Plasma treatment increased shear bond strength between heat cured acrylic resin and self-curing acrylic resin (2003)
    Oxford, UK : Blackwell Science Ltd
    Journal of oral rehabilitation 30 (2003), S. 0 
    Details
    ISSN: 1365-2842
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: summary  Self-curing acrylic resin is generally used for the repair of a fractured denture base. However, re-fracture of the repaired denture base resin often occurs because of poor bonding strength between the base resin and self-curing repair resin. The effect of plasma treatment on the shear bond strength between heat cured acrylic resin and the self-cured acrylic was examined. It was revealed that plasma irradiation is effective in increasing the shear bond strength. Plasma irradiation does not cause environmental pollution, as it does not require chemicals. It is a useful method to increase adhesive strength between heat cured acrylic resin and self-curing acrylic resin.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-2842.2003.01198.x
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  • 8
    Digitale Medien
    Digitale Medien
    The effect of diabetes mellitus on histopathological changes in the denture-supporting tissues under continuous mechanical pressure in rat (1999)
    Oxford, UK : Blackwell Science Ltd
    Journal of oral rehabilitation 26 (1999), S. 0 
    Details
    ISSN: 1365-2842
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: The histopathological changes in denture-supporting tissues of streptozotocin-induced diabetes mellitus rat were studied in relation to continuous mechanical pressure exerted through an experimental denture base. The experimental dentures were designed to load continuous mechanical pressures (3·4, 1·5 or 0·5 kPa) to the hard palate of the molar region of a rat. From the results of this study, the following conclusions were drawn: the streptozotocin-induced diabetic condition (1) tended to prolong the appearance period of a shortened epithelial ridge, and weakened the phenomenon, (2) reduced the appearance period and severity of the compression of epithelium, (3) delayed the time of manifestation of the proliferative change in the recovery process of the shortened epithelial ridge, and weakened the phenomenon, (4) prolonged the appearance period of the compressed lamina propria mucosae, and enhanced the phenomenon, (5) reduced the number of osteoclasts, (6) lowered the threshold for induction of the osteoclastic bone resorption to between 1·5 and 0·5 kPa, (7) inhibited the appearance of osteoblast which follows the disappearance of osteoclasts, (8) did not induce any inflammatory change, and (9) tended to enhance the longitudinal change of the continuous mechanical pressure. The histopathological changes in the denture-supporting tissues of the streptozotocin-induced diabetes mellitus rat related highly to the longitudinal change of the continuous mechanical pressure exerted through the denture base. From the results of this study, it was suggested that the streptozotocin-induced diabetic condition lowers the tolerance of the denture-supporting tissues to continuous mechanical pressure.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-2842.1999.00354.x
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  • 9
    Digitale Medien
    Digitale Medien
    Photoemission studies of bonding properties at the MBE-grown CaF"2/GaAs interface
    Amsterdam : Elsevier
    Applied Surface Science 41-42 (1989), S. 647-653 
    Details
    ISSN: 0169-4332
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0169-4332(89)90137-2
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  • 10
    Digitale Medien
    Digitale Medien
    A case of anorexia nervosa with hyperbilirubinaemia in a patient homozygous for a mutation in the bilirubin UDP-glucuronosyltransferase gene (1999)
    Springer
    European journal of pediatrics 158 (1999), S. 547-549 
    Details
    ISSN: 1432-1076
    Schlagwort(e): Key words Gilbert syndrome ; Bilirubin UDP-glucuronosyltransferase gene ; UGT1A1 ; Homozygous missense mutation ; Anorexia nervosa
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Gilbert syndrome was diagnosed in a girl with anorexia nervosa and unconjugated hyperbilirubinaemia. Since the patient was starved and hyperbilirubinaemic, the loading test was not used for the diagnosis but analysis of the bilirubin UDP-glucuronosyltransferase gene (UGT1A1) instead. The patient was homozygous for a missense mutation that replaced guanine with adenine at nucleotide number 211 (211G→A: G71R). The unconjugated hyperbilirubinaemia was apparently induced by the fasting state. Homozygous missense mutations of the gene have been generally recognized as responsible for Crigler-Najjar syndrome type II; the results obtained here, however, confirm that Gilbert syndrome may also be caused by a homozygous missense mutation of UGT1A1. Conclusion Since anorexia nervosa patients are in a fasting state, they may show moderate unconjugated hyperbilirubinaemia if they have Gilbert syndrome. Gene analysis of such cases will rule out hepatic damage. Homozygous missense mutations of the bilirubin-UDP-glucuronosyltransferase gene cause not only Crigler-Najjar syndrome type II but also Gilbert syndrome.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s004310051143
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