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  • 1
    Digitale Medien
    Digitale Medien
    Permeability of dentine after Nd:YAG laser treatment: an in vitro study (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 24 (1997), S. 0 
    Details
    ISSN: 1365-2842
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: summary The purpose of this investigation was to determine the effects of Nd:YAG laser treatment on the permeability of dentine. Forty dentine discs were prepared by horizontal sectioning through the middle coronal third of freshly extracted non-carious third molars. After the removal of the pulp the discs were finished with 600 grit and divided into three test groups and one control group (n = 10). For the test groups three different laser power settings were chosen: test group A: 3 × 60 sec, 60 mJ; test group B: 3 × 60 sec, 90 mJ; test group C: 3 × 60 sec, 120 mJ. No laser treatment was performed on the control group. In a two-chamber system the filtration rate of dentine tubules from an exactly defined area of the specimens was measured using a radioactive Ringer solution under a pressure of 30 cm H2O. Permeability measurements were carried out three times prior to lasing, three times immediately following laser treatment and six times after the application of phosphoric acid. Analysis of variance showed a significant influence of the Nd:YAG laser treatment on the permeability of dentine (P 〈 0.001). The mean quotient of non-treated control vs. lased dentine was 2.19 ± 0.86 for the 60 mJ beam, 1.49 ± 0.88 for the 90 mJ beam, and 204 ± 2.17 for the 120 mJ beam. Etching the lased surfaces had a statistically significant influence on the permeability of the dentine only in the 60 mJ group (P 〈 0.001). The data show that the Nd:YAG laser treatment often increases the permeability of smear layer covered dentine but moderates the increase of permeability after etching the surface with phosphoric acid.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2842.1997.tb00326.x
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  • 2
    Digitale Medien
    Digitale Medien
    Quantitative analysis of cell types during growth and morphogenesis in Hydra (1973)
    Springer
    Development genes and evolution 171 (1973), S. 269-285 
    Details
    ISSN: 1432-041X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Tissue maceration was used to determine the absolute number and the distribution of cell types in Hydra. It was shown that the total number of cells per animal as well as the distribution of cells vary depending on temperature, feeding conditions, and state of growth. During head and foot regeneration and during budding the first detectable change in the cell distribution is an increase in the number of nerve cells at the site of morphogenesis. These results and the finding that nerve cells are most concentrated in the head region, diminishing in density down the body column, are discussed in relation to tissue polarity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00577725
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  • 3
    Digitale Medien
    Digitale Medien
    Root lesions in a group of 50–60 year-old Germans related to clinical and social factors (1999)
    Springer
    Clinical oral investigations 3 (1999), S. 168-174 
    Details
    ISSN: 1436-3771
    Schlagwort(e): Key words Root caries ; Prevalence ; Middle age ; Risk factors
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  From a preventive point of view collection of data concerning carious and non-carious cervical tooth defects is definitely important. Consequently, the prevalence and distribution of different root lesions were studied and correlated with behavioral and biological factors in 50- to 60-year-old German individuals (n=298). Additionally, the data were correlated with characteristics concerning oral health and known risk factors such as gender, educational level, and presence of plaque. An interview included questions on sociodemographic and socioeconomic characteristics, dental and general health status, and various behavioral parameters. During clinical examination data concerning coronal and root lesions, restorations, probing depth, gingival bleeding, and dental plaque were obtained. The participants represented a social middle class population with a high awareness of dental health. Obviously, for the participants, known risk factors for root decay such as gender, educational level and plaque index were of minor importance. Factors correlating with root caries were: (a) number of missing teeth, (b) probing depth, (c) smoking habit, (d) regular dental attendance and (e) the reason for the last dental treatment. Additionally, the prevalence of non cariogenic lesions, primarily resulting from increased but wrongly performed oral self care, seems gradually to relieve carious root destruction.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s007840050097
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  • 4
    Digitale Medien
    Digitale Medien
    Fluoride uptake in dentin with and without simulating dentinal fluid flow (1997)
    Springer
    Clinical oral investigations 1 (1997), S. 125-130 
    Details
    ISSN: 1436-3771
    Schlagwort(e): Key words Fluoride ; Dentin ; Dentinal fluid flow
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract The aim of the present study was to compare fluoride uptake of dentin with and without simulating dentinal fluid flow. Eighty-five dentinal discs were prepared from retained human molars. Seventeen discs were used to assess baseline fluoride content (controls). Sixty-eight discs were evenly distributed among two experimental groups and were fixed for 24 h in a two-chamber device allowing for simulating dentinal fluid flow. Thirty-four samples were treated with dentifrice slurry containing a low fluoride concentration (Elmex, dilution 1:5); the remaining discs were treated with a solution of a high fluoride concentration (Elmex Fluid). For the perfused group, each of the 17 discs of the high and low concentration fluoride groups were constantly perfused during the experiment. The remaining fluoridated specimens were not perfused. All specimens were assayed for KOH-soluble fluoride and structurally bound fluoride. Structurally bound fluoride was determined in three successive layers of 20 µm each. Uptake of KOH-soluble fluoride was significantly higher in the specimens fluoridated with Elmex Fluid compared to the samples treated with the dentifrice slurry. The uptake of KOH-soluble fluoride was not influenced by perfusion of the dentinal discs. However, perfusion resulted in lower acquisition of structurally bound fluoride in the samples treated with the dentifrice slurry. After application of Elmex Fluid, no significant difference was found in the amount of structurally bound fluoride between the perfused specimens and non-perfused samples. It is suggested that further studies on fluoride uptake in dentin should use a model simulating outward dentinal fluid flow.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s007840050023
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  • 5
    Digitale Medien
    Digitale Medien
    Zur gesundheitlichen Bedeutung des Tanzens im Alter (1999)
    Springer
    Zeitschrift für Gerontologie + Geriatrie 32 (1999), S. 207-212 
    Details
    ISSN: 0044-281X
    Schlagwort(e): Schlüsselwörter Präventives Training – Belastungsintensität – Seniorentanz – Alterssport ; Key words Preventive exercise – exercise intensity – dance for the elderly – sports for the elderly
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary In field research, training intensity was tested during three different dances by recording the exercise heart rates. The subjects (twelve women from 59 to 77 years old) were tested once a week three times, over three minutes with a break of three minutes, three weeks in all. The sequence of the dances changed every week. 108 values of the maximum heart rates measured were considered for statistical calculation. 77 percent of these values were above the threshold to reach health related relevance. There was no significant difference between the seperate dances. The results suggest that dancing even of slow dances will have positive effects for a preventive heart-circulatory training, when the exercise program takes into account, within the context of a particular group, the needs of the individual, especially training duration and training frequency.
    Notizen: Zusammenfassung In einer Felduntersuchung wurde die Belastungsintensität während dreier, vom Takt und Tanzprofil her unterschiedlicher Tanzformen bei 12 Frauen im Alter von 59 bis 77 Jahren ( {\overline x} = 69 Jahre) mittels Pulsfrequenzmessung erhoben. Die Versuchspersonen wurden jeweils dreimal 3 Minuten lang mit je 3 Minuten Pause belastet, dies insgesamt dreimal im Wochenabstand. Dabei wurde die Abfolge der Tänze von Woche zu Woche variiert. Die erzielten auswertbaren 108 Spitzenwerte lagen zu 77 % oberhalb der Reizschwelle für ein gesundheitsorientiertes Ausdauertraining. Diese Ergebnisse lassen erwarten, daß das Tanzen auch relativ langsamer Tanzformen bei wenig trainierten Frauen im fortgeschrittenen Lebensalter positive Effekte im Sinne eines präventiven Herz-Kreislauf-Trainings verspricht, wenn es im konkreten Fall gelingt, die beim Tanzen erreichbare Belastungsintensität durch weitere, individuell auf die Population abgestimmte Belastungsnormative, insbesondere Belastungsdauer und -häufigkeit, zu ergänzen.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s003910050106
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  • 6
    Digitale Medien
    Digitale Medien
    Probleme der Schwerhörigkeit im Alter (1971)
    Springer
    Sozial- und Präventivmedizin 16 (1971), S. 85-89 
    Details
    ISSN: 1420-911X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Zusammenfassung Die vorliegende Arbeit diskutiert die wesentlichen Ursachen der Schwerhörigkeit im Alter. Unter den endogenen pathogenetischen Faktoren wird die zentrale Bedeutung der arteriellen und venösen Kreislaufverhältnisse des Innenohres betont. Die Möglichkeiten, wirkungsvolle Präventivmaßnahmen durchzuführen, sind bei endogenen schädigenden Faktoren noch begrenzt. Exogene Schädigungen hingegen, insbesondere die Folgen des akuten und chronischen Lärmtraumas und der entzündlichen Erkrankungen, werden durch eine sinnvolle Prophylaxe einerseits, durch medikamentöse und operative Therapie andererseits entscheidend beeinflußt. Der Facharzt kann somit in diesen Fällen häufig die Hörfunktion erhalten oder wiederherstellen.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02030420
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  • 7
    Digitale Medien
    Digitale Medien
    Expression and characterization of the ”laminin binding protein” in hydra (1997)
    Springer
    Cell & tissue research 287 (1997), S. 507-512 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Key words: Laminin binding protein (LBP) ; Rapidly cycling cells ; CDC2 kinase ; Cytoplasmic localization ; Hydra vulgaris (Cnidaria) ; Chlorohydra viridissima (Cnidaria)
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract. Recently, a cDNA was isolated from hydra with extensive homology to a mammalian and invertebrate gene which codes for a protein called laminin binding protein (LBP). In this paper we describe the protein expression of the hydra LBP in Escherichia coli. On SDS gels the recombinant hydra LBP displayed an apparent molecular mass of 43 kDa, although the calculated mass, including six additional histidines, is 33.7 kDa. Polyclonal antibodies were produced against the hydra recombinant LBP. The antiserum reacted with a 42-kDa and a 43-kDa protein from Hydra vulgaris and from a multiheaded mutant of Chlorohydra viridissima, respectively. In hydra, LBP RNA and protein were highly expressed in cells with short cell cycles, such as all cells of the interstitial cell lineage, less in slowly cycling epithelial cells, and at very reduced levels or not at all in differentiated cells. Higher expression in the multiheaded mutant of C. viridissima than in H. vulgaris, the cells of which differ in doubling time, hint at a function in cell proliferation. This is supported by the finding that in vitro hydra LBP is a substrate for the cell-cycle-specific kinase CDC2.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s004410050774
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