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  • 1
    Electronic Resource
    Electronic Resource
    Avulsed permanent teeth: a review of the literature and treatment guidelines (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Dental traumatology 13 (1997), S. 0 
    Details
    ISSN: 1600-0595
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract Dental trauma represents one of the few situations where dentists are called upon to make unscheduled diagnostic and treatment decisions in an area that is outside their routine experience. Since patients who sustain an avulsion present infrequently, except in child-oriented or emergency-based practices, clinicians often make diagnostic and management decisions based upon their previous rare treatment experiences. Clinicians also rely on published guidelines for this aspect of their practice and expect these standards to be up-to-date and based on current research information. None of the current protocols has been tested by a prospective longitudinal outcome study in humans. Nevertheless, current guidelines have become the standard for clinical practice around the world. An effort must be made to develop treatment protocols that are based upon the biological mechanisms that underlie periodontal wound healing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-9657.1997.tb00031.x
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  • 2
    Electronic Resource
    Electronic Resource
    Survival of avulsed permanent maxillary incisors in children following delayed replantation (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Dental traumatology 13 (1997), S. 0 
    Details
    ISSN: 1600-0595
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract The purpose of this study was to identify the variables that significantly influenced the survival of incisors replanted after extended extraalveolar duration at The Hospital for Sick Children, Toronto, Canada, between June 1988 and December 1993. Survival analysis was used to identify variables that significantly influence the retention of replanted incisor teeth. Survival was defined as the time that elapsed between the replantation of an avulsed incisor and the time it was finally lost. Information on 9 variables was collected for 3H patients (25 males; 13 females) and 52 replanted permanent maxillary incisors. The mean extraalveolar duration for the sample was 123 min. The mean follow-up interval was 942 days (range: 364–2126 days). Incisors replanted with open apices had a significantly decreased survival compared with teeth with mature apices (P=0.04; relative risk 4.2). There was also a significant association between increased survival and obturation of the root canal with gutta-percha and sealer P=0.006 relative risk 10.0). A trend towards improved survival of replanted incisors was found for children older than I 1 years old at the time of replantation (P= 0.09; relative risk 2.8). These results are consistent with previous studies and may assist clinicians and parents in the decision-making process associated with the management of avulsed teeth in children.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-9657.1997.tb00054.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Storage conditions of avulsed teeth affect the phenotype of cultured human periodontal ligament cells (2000)
    Copenhagen : Munksgaard International Publishers
    Journal of periodontal research 35 (2000), S. 0 
    Details
    ISSN: 1600-0765
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: After severe injury to the periodontal ligament (PL), the phenotypes of cells recolonizing root surfaces influence the extent and type of repair processes. In teeth that are replanted following avulsion injury, recolonization of the PL space by osteogenic cells instead of by PL fibroblasts may favor bone formation (i.e. ankylosis) instead of PL regeneration. We consider here that recolonization processes depend in part on the storage conditions of the teeth following avulsion. We used an in vitro cell culture model to assess the effect of storage conditions on immunohistochemical staining of several marker proteins that are expressed by osteogenic cells (osteopontin and alkaline phosphatase) and fibroblasts (α-smooth muscle actin, type III and XII collagens). Prior to cell culture, extracted human premolar teeth were stored in air (“dry”) or in α-MEM (“wet”) for either 30 or 120 min as surrogate conditions for the variations of extra-alveolar tooth storage that may occur following avulsion. Collagenase/trypsin-digested suspensions of PL cells were prepared from the tissue adherent to the extracted root surface. Passage #2 or #3 cultures were immunostained and examined by fluorescence microscopy. For type XII collagen, cells from wet samples displayed perinuclear staining while cells from 30-min dry samples showed only isolated foci. The staining for 120-min dry samples was weak and non-specific. α-Smooth muscle actin was not incorporated into stress fibers in wet samples, whereas dry samples demonstrated prominent stress fibers stained for α-smooth muscle actin. Detached cytoplasmic fragments resembling cell processes that stained for α-smooth muscle actin were abundant in dry samples, indicating the presence of highly contractile cells. The staining for osteopontin was mainly perinuclear but was more intense in dry samples. The focal adhesion pattern of osteopontin staining in 120-min dry samples resembled that of migrating osteogenic cells. The pattern of staining did not vary for type III collagen or alkaline phosphatase, although staining for alkaline phosphatase was more intense in samples stored under dry conditions. We conclude that prolonged extra-alveolar dry storage favors increased in vitro growth of contractile cells expressing osteogenic cell markers while storage in cell culture medium favors growth of cells with the classical phenotype of PL fibroblasts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1600-0765.2000.035001042.x
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  • 4
    Electronic Resource
    Electronic Resource
    Differential thermal analysis studies of chemical systems in sealed cells (1970)
    Springer
    Journal of thermal analysis and calorimetry 2 (1970), S. 461-468 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Résumé De nombreux systèmes chimiques illustrant les principaux types de réaction peuvent être étudiés d'une manière commode par analyse thermique différentielle. On élimine les problèmes provenant de la vaporisation et de la sublimation par l'emploi d'ampoules de verre scellées. On prend des échantillons de 10 à 100 mg. Cette quantité, quoique déjà faible, est plus que suffisante pour faire l'analyse chimique par des méthodes instrumentales comme la spectroscopie infrarouge et la chromatographie en phase gazeuse.
    Abstract: Zusammenfassung Die Differentialthermoanalyse ist zur Untersuchung vieler Systeme mit den wesentlichsten Reaktionstypen geeignet. Durch Verdampfen und Sublimieren verursachte Veränderungen beseitigt man durch die Verwendung verschlossener Glasampullen. Die Größe der Probe bewegt sich von 10 bis 100 mg. Diese Menge reicht aus, um eine chemische Analyse durch Infrarotspektroskopie oder Gaschromatographie durchzuführen.
    Notes: Abstract Many chemical systems illustrating major reaction types may be conveniently studied by differential thermal analysis. The problems of vaporization and sublimation have been avoided through the use of sealed glass vials. Sample sizes are in the range of 10 to 100 milligrams. This size though small is still more than adequate for chemical analysis by instrumental methods such as infrared spectroscopy and gas chromatography.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01911615
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    Paper (German National Licenses)
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