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  • 2005-2009  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Reinforcement of Denture Base Resin (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advances in science and technology Vol. 49 (Oct. 2006), p. 124-129 
    Details
    ISSN: 1662-0356
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Natural Sciences in General , Technology
    Notes: The fracture resistance of polymethyl methacrylate (PMMA) the most populardenture base materials, is not satisfactory. The aim of this study is to improve the mechanicalproperties of PMMA by adding filler particles. Different inorganic filler particles includingmicronised glass flakes, acryl silane micronised, glass flakes 350nm, TiO2 and ZrO2 withdifferent ratios by weight were incorporated into heat-cure plain PMMA and processed withoptimal condition [2.5:1 Powder/ monomer ratio, conventional packing method and waterbath curing for 2 hours at 95ºC] to produce 12mm diameter and 2mm thick discs. PlainPMMA without additives was prepared as a test control. Three types of mechanical tests,biaxial flexure, microindentation fracture toughness and Vickers hardness were carried out onthe samples. It was found that incorporating the particles did not improve the biaxial flexuralstrength of the resin. However, TiO2, ZrO2 and micronised glass flakes increased the fracturetoughness of the resin. The hardness of PMMA was improved by the incorporation of all theparticles
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.49.124.pdf
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Electron spectroscopy and microscopy applied to chemical and structural analysis of hair (2005)
    Oxford, UK : Blackwell Science Ltd
    International journal of cosmetic science 27 (2005), S. 0 
    Details
    ISSN: 1468-2494
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The application of surface specific X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) will be shown to be an effective means for the elucidation of hair fiber surface chemistry and structure. Example studies of bleaching and fiber conditioning treatments are discussed. The bleached fiber surface is found to become more hydrophilic due to the loss of the naturally occurring hydrocarbon overlayer and oxidation of surface functional groups as a result of bleaching. Comparison between generic bleaching regimens illustrates the importance of increased pH and the presence of surfactant for effective treatment. Adsorption of conditioning diester quat and dimethicone molecules reintroduces a hydrophobic like surface layer on the hair fiber. Spectroscopic data indicate a segregated adsorption structure of the chemically different conditioning molecules. Electron microscope images of the conditioned hair show a smooth uniform surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.0142-5463.2005.00265_5.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Palatal discrepancies and postdams (2005)
    Oxford, UK : Blackwell Science Ltd
    Journal of oral rehabilitation 32 (2005), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: summary  To investigate the variation in post-cure palatal discrepancy of dentures, 20 complete maxillary replica dentures were prepared on models with high and low palates and processed by conventional compression moulding and injection moulding. Measurements were made by travelling microscope of the sagittal midline discrepancies between palate and model on three occasions; after processing; after removal of part of the investing plaster; and after immersion in water for 1 month at 37 °C. The magnitudes of discrepancies were greatest distally, diminishing with distance anteriorly from the postdam. They increased with partial removal of plaster, and decreased slightly after immersion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.2004.01403.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Triplet–singlet spin relaxation via nuclei in a double quantum dot (2005)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 435 (2005), S. 925-928 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The spin of a confined electron, when oriented originally in some direction, will lose memory of that orientation after some time. Physical mechanisms leading to this relaxation of spin memory typically involve either coupling of the electron spin to its orbital motion or to nuclear spins. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature03815
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Castability and Biocompatibility of Novel Fluorcanasite Glass-Ceramics (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 309-311 (May 2006), p. 293-296 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Novel fluorcanasite based glass-ceramics were produced by controlled two stage heattreatment of as-cast glasses. Castability of parent glasses was determined using a graduated spiral cast piece. Fluorcanasite glasses were also cast to form complex shapes using the lost wax casting technique. Gypsum and phosphate bonded investments were used to investigate their effect on thecasting process, cast surface crystallinity and biocompatibility. The stoichiometric composition had the greatest castability but the other two modified compositions also had good castability. X-ray diffraction showed similar bulk crystallisation for each glass irrespective of the investment material. However, some differences in surface crystallisation in the presence of different investment materials were detected. Discs cast using gypsum bonded investment showed greater in vitro biocompatibility than equivalent discs cast using phosphate bonded investment under the conditionsused. Gypsum and phosphate bonded investments could both be successfully used for the lost wax casting of these novel fluorcanasite glasses
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.309-311.293.pdf
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    Paper (German National Licenses)
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