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  • Articles: DFG German National Licenses  (2)
  • Chromium Sulphate  (1)
  • carriers  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Ultrastructural aspects of human dentine decalcified with chromium sulphate (1969)
    Springer
    Calcified tissue international 4 (1969), S. 305-313 
    Details
    ISSN: 1432-0827
    Keywords: Decalcification ; Chromium Sulphate ; Ultrastructure ; Dentine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé Une méthode nouvelle de décalcification histologique utilisant des solutions aqueuses de sulfate de chrome basique (III) est appliquée à des coupes fines de dentine humaine adulte. L'observation en microscopie électronique montre une bonne conservation structurale dans les régions extra-cellulaires. L'aspect de la matrice péricanaliculaire est particulièrement étudié. On y reconnait plusieurs couches bien individualisées. Une bonne concordance est notée entre les résultats obtenus par microscopie optique et électronique, permettant d'établir une hypothèse nouvelle sur la formation de la dentine péricanaliculaire.
    Abstract: Zusammenfassung Eine kürzlich entwickelte Methode zur histologischen Entkalkung mittels wäßriger Lösungen von basischem Chrom III-Sulfat wird an dünnen Schliffen von menschlichem Dentin Erwachsener angewandt. Darauffolgende Untersuchungen am Elektronenmikroskop zeigten eine sehr gute Wiedergabe der morphologischen Einzelheiten in den Extrazellulär-Regionen. Besonders beachtet wurde das Aussehen der peritubulären Matrix, innerhalb welcher gut differenzierte Schichten erkannt werden konnten. Eine wesentliche Übereinstimmung bestand zwischen Elektronenmikroskopie und kürzlich durchgeführten Untersuchungen an derselben Matric unter dem Mikroskop. Diese Methode ermöglicht es, eine neue Hypothese über die Bildung des peritubulären Dentins aufzustellen.
    Notes: Abstract A recently-developed method for histological decalcification using aqueous solutions of basic chromium (III) sulphate has been applied to thin sections of adult human dentine. Subsequent studies in the electron microscope show a very good retention of morphological detail in the extracellular regions. Special attention was given to the appearance of the peritubular matrix within which well-differentiated layers were recognised. There was substantial agreement between electron microscopy and recent studies of the same matric under the light microscope, allowing a novel hypothesis for the formation of the peritubular dentine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02279133
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    BMP-Induced osteogenesis on the surface of hydroxyapatite with geometrically feasible and nonfeasible structures: Topology of osteogenesis (1998)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 39 (1998), S. 190-199 
    Details
    ISSN: 0021-9304
    Keywords: BMP ; geometry ; carriers ; hydroxyapatite ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Bone morphogenetic protein (BMP) is known to require a suitable carrier to induce ectopic bone formation in vivo. Hydroxyapatite ceramics have been reported to be effective in some forms but ineffective in others as a carrier of BMP-induced bone formation. In this study we compare three geometrically different forms of hydroxyapatite to examine their functions as carriers of BMP-induced bone formation. A fraction containing all the active BMPs (BMP cocktail) was partially purified from a 4M guanidine extract from bovine bone by a three-step chromatographic procedure. The BMP cocktail was combined with each of three forms of hydroxyapatite - solid particles (SPHAP), porous particles (PPHAP), and coral-replicated porous tablets (coral-HAP) - and implanted subcutaneously into rats. Both the PPHAP and coral-HAP systems induced osteogenesis 2 weeks after implantation, as evidenced by morphological and biochemical observations. Details of the osteogenetic process were followed by double-fluorescence labeling in the coral-HAP system to confirm bone formation on the surface of hydroxyapatite. However, there was no evidence of osteogenesis or chondrogenesis in the SPHAP system. The results indicate that the geometry of the interconnected porous structure in PPHAP and coral-HAP create spaces for vasculature that lead to osteogenesis while the smooth structure and close contact of particles in SPHAP inhibit vascular formation and proliferation of mesenchymal cells, preventing bone and cartilage formation. It was concluded that the geometrical structure in hydroxyapatite ceramics that induces vasculature is crucial as a carrier for BMP-induced bone formation. © 1998 John Wiley & Sons, Inc. J Biomed Mater Res, 39, 190-199, 1998.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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