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  • 1990-1994  (7)
  • 1935-1939
  • 1990  (7)
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  • 1990-1994  (7)
  • 1935-1939
Year
  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 6946-6952 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Superconducting, silver-doped films of Y1Ba2Cu3O7−δ have been deposited by spray pyrolysis of aqueous nitrate solutions onto MgO substrates. The superconducting transport properties, microstructure, and microwave losses have been characterized for various amounts of AgNO3 added to the spraying solution. These films had resistive transition temperatures between 79 and 85 K with widths from 3 to 7 K. The room-temperature resistivity was a strong function of the silver doping, dropping by a factor of 50 for the heavily doped films. Critical current densities at 4 K were typically several 103 A/cm2 with little correlation to the silver doping. Lattice constants also were not significantly affected by the silver doping level, however, lightly doped films were denser, had the strongest c axis preferred orientation, and a smoother surface. Rf surface resistance was measured at 18 GHz, and for the best films dropped a factor of 10 below copper by 40 K. The London penetration depth was estimated to be approximately 1 μm for the best films.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of periodontal research 25 (1990), S. 0 
    ISSN: 1600-0765
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: This study analyses the infrastructure of the plasma cell population of periodontitis-affected soft tissue close to the advancing front of interdental lesions. Biopsies from 20 patients and 3 control volunteers were examined: 5 with treated adult periodontitis (AP), 5 with untreated AP, 5 with treated juvenile or postjuvenile periodontitis (JP) and 5 with untreated JP. Plasma cell (PC) counts increased significantly (p 〈 0.05) with lesion severity. They were absent from epithelium and sparse in the clinically healthy control specimens. Degenerate PC tended to be more numerous within JP tissue but differences were not significant (p 〉 0.05) when compared to AP. Intact plasma cells were never seen within JP superficial connective tissue. Russell bodies were small and few in number. The presence of degenerated plasma cells indicated normal formation and release of immunoglobulins within the tissues of AP and JP. Increased counts of degenerate PC and tissue destruction in JP suggested a correlation, possibly attributable to anti-collagen antibody secretion.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of clinical periodontology 17 (1990), S. 0 
    ISSN: 1600-051X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract The nature of the relationship between dental plaque and chronic inflammatory periodontal disease (CIPD) remains unclear, although there is no doubt that plaque is the direct cause. Non–specific, specific and exogenous hypotheses have been proposed to explain plaque-host relationships. Current evidence indicates that plaque is part of the natural human microflora, one of many such in nature, and that disruption of oral microbial ecology, due primarily to diet texture changes, leads to gingivitis and periodontitis. These result in increased plaque accumulation, and particularly in increased interdental effective plaque thickness. The latter leads to alterations in plaque ecology, particularly increasing anaerobiosis, with resultant shifts in proportions of its constituent species. These shifts are responsible for the increased counts of, for example, Bacteroides gingivalis, Actinobacillus actinomycetemcomitans, Fusobacterium nucleatum, Wolinella recta, spirochaetes and others, associated with chronic periodontitis in its various forms. Measures to prevent or control chronic periodontitis should aim, not to eliminate plaque, which ignores ecology and would compromise host defence, but to restore the species distribution in plaque to that compatible with health.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of clinical periodontology 17 (1990), S. 0 
    ISSN: 1600-051X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract. Subgingival plaque samples from 20 patients with chronic inflammatory periodontal disease were exposed to a commercial gel formulation containing 2 amine fluorides. The MIC of the gel for these samples ranged from 33 to 260 μ/ml with a modal value of 260 μ/ml. In each sample, the most resistant organisms (i.e., those organisms surviving at one doubling dilution below the MIC) were identified. 33 such organisms were isolated, of which 22 (67%) were strict anaerobes, and 25 (75%) were Gram negative. The 2 most frequent isolates were Bacteroides ruminicola ss. brevis and a Selenomonas species, neither of which is a recognised periodontopathogen. The gel had a rapid effect on the viability of the bacteria in the plaque samples, the 90% kill time being 17 min or less for 90% of the samples (range 〈5 to 71 min).
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of clinical periodontology 17 (1990), S. 0 
    ISSN: 1600-051X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract. This case report of severe periodontitis concerns a young male patient with chronic idiopathic neutropenia seen between 1981 and 1983 by the School of Dental Medicine of Geneva and from 1984 to 1988 by the Eastman Dental Hospital of London. The patient was maintained by intermittent systemic antibiotics, subgingival chlorhexidine irrigation, conventional debridement, brushing, and wire-mesh and composite splinting of loose teeth. After leaving school, at the patient's express wish, the extreme downhill pattern of the periodontitis resulted in removal of affected teeth and overdenture construction. The extracted teeth and associated soft tissues were examined for relevant plaque and host response features. The intact morphotypes associated with the advancing front of the lesion were invariably Gram-negative or positive coccoid cells, or less commonly short rods, as in all documented forms of periodotitis. Connective tissue destruction was associated with a leucocyte accumulation comprising mainly polymorphonuclear neutrophils (PMN) and plasma cells. Both were observed degenerated more deeply than in routine adult periodontitis, including PMN lysosome loss and lymphocyte maturation within peripheral blood vessels. Only in one instance, one part of the superficial connective tissue of one block contained bacteria. It was concluded that the features of plaque and the lesion suggest a typical first line of defence response as in other forms of periodontitis. From the consideration of the 10 years clinical history of the patient, it is clear that non-surgical management is possible even in extreme cases, without any compromise of the patient's oral or systemic health, and in accord with the patient's wishes.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of clinical periodontology 17 (1990), S. 0 
    ISSN: 1600-051X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract In this study, mycoplasma were enumerated in the gingival crevicular fluid (GCF) of gingivitis and periodontitis patients. GCF samples were obtained from the mesial (approximal) gingival crevice or periodontal pocket of the maxillary right first permanent molar. Samples were cultured anaerobically on a medium selective for mycoplasmas as well as on a non-selective medium to obtain a total anaerobic count. Mycoplasmas were present in the GCF of both gingivitis and periodontitis patients, but a greater % was obtained from the GCF of patients with periodontitis. The proportions of mycoplasma appeared to be independent of the disease activity as expressed by bleeding on probing (FBI), but to be related to probeable pocket depth, as shown by the higher %s in periodontitis than gingivitis for a given FBI. On the basis of an increased proportion in relation to disease severity, mycoplasmas would therefore appear to be amongst those micro-organisms associated with CIPD.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of clinical periodontology 17 (1990), S. 0 
    ISSN: 1600-051X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract Part of the results of a study of subgingival plaque by darkground microscopy was used to investigate morphotype distribution at different levels within the periodontal pocket. Subgingival plaque was sampled at coronal, middle and apical levels from each of 28 approximal surfaces on 28 teeth extracted from 28 adults with untreated moderate to advanced penodontitis. Sample preparation and darkground microscopy were as described previously. The data recorded only the subgingival level at which the maximum count occurred for a given morphotype and subject. It was found that the maximum count of spirochaetes occurred most frequently at the apical level (p〈0.05) and the maximum count of‘others' at the coronal level (p〈0.05). Also, coccal counts showed a trend to increase the more apical the sample. Standardised darkground microscopy was able to show that the sampled subgingival level had a significant influence on plaque bacterial morphotype distribution, indicating the importance of accurate sampling of subgingival plaque at the most apical level.
    Type of Medium: Electronic Resource
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