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  • 1
    Electronic Resource
    Electronic Resource
    Influence of different curette insertion depths on the outcome of non-surgical periodontal treatment (1999)
    Munksgaard : Munksgaard International Publishers
    Journal of clinical periodontology 26 (1999), S. 0 
    Details
    ISSN: 1600-051X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract. This study was undertaken to compare the effects of scaling and root planing (Sc/RP) performed from approximately 1 mm coronal to (test Sc/RP) or at the bottom of (control Sc/RP) the probeable pocket to the gingival margin. 2 male and 5 female patients with moderate to severe periodontitis participated in the study. Initial examination was performed with respect to probing pocket depth (PPD) and probing attachment level (PAL) using a pressure-controlled periodontal probe and stents. The patients received repeated instruction in oral hygiene, and their plaque control reached an excellent level. Baseline examination including PPD and PAL measurements was then performed. Following the baseline examination, single-rooted teeth in 1 quadrant of each dentition were randomly selected and subjected to the test Sc/RP (test teeth) or control Sc/RP (control teeth). The PPD and PAL were measured 1 and 3 months following Sc/RP. It was demonstrated that: (i) the PPD reduction following Sc/RP was larger at the sites with initially deep pockets than at the sites with shallow pockets; (ii) the mean PPD reduction at the sites with an initial PPD ≥3.5 mm was significantly larger in the control teeth than in the test teeth; (iii) there was a significant PAL gain in the initially deep pockets but not in the initially shallow pockets; (iv) the PAL gain in the initially shallow pockets was significantly larger in the control teeth than in the test teeth. In the treatment of periodontitis, trauma caused by Sc/ RP to the most coronal part of the connective tissue attachment seems to be of minor importance compared to the effective removal of subgingival deposits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1600-051X.1999.t01-3-261101.x
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  • 2
    Electronic Resource
    Electronic Resource
    Calcium and silicon from bioactive glass concerned with formation of nodules in periodontal-ligament fibroblasts in vitro (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 24 (1997), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: summary Previously, the authors reported that bioactive glass promoted formation of nodules in cultured periodontal-ligament fibroblasts and high concentrations of calcium and silicon were detected in the culture medium. Herein, the effects of bioactive glass, calcium alone and calcium and silicon for formation of nodules on the periodontal-ligament fibroblasts are examined. The cells were cultured with bioactive glass, without bioactive glass, calcium and silicon, with calcium alone and with calcium and silicon. The ceil growth, alkaline-phosphatase activity, amount of pro-collagen type I and the number of nodules were measured periodically until the 21st day. The cell growth rate with calcium and silicon was the highest, however the rate with bioactive glass and calcium alone were similar to that without them. The alkaline-phosphatase activity and the amount of pro-collagen showed peaks at the 11th day. At the peak, the alkaline-phosphatase activity with bioactive glass or calcium and silicon, and the pro-collagen with bioactive glass was higher than without them. The number of nodules with bioactive glass, calcium alone or calcium and silicon was greater than without them. These findings suggested that the combination of calcium and silicon released from bioactive glass was concerned with the formation of nodules on the periodontal-ligament cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1997.tb00263.x
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  • 3
    Electronic Resource
    Electronic Resource
    Augmented railgun using a permanent magnet (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 4227-4232 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The use of a permanent magnet instead of an electromagnet has been proposed for the augmentation of the magnetic field of a railgun driven by a current of approximately 20 kA. A permanent magnet has the following advantages in comparison with conventional augmentations using additional turns: (1) simple configuration of the system, (2) temporally and spatially constant magnetic fields, and (3) high efficiency. Here, the operation of a conventional railgun and that of an augmented railgun using a permanent magnet are compared experimentally, and the usefulness of the permanent magnet is described. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145374
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  • 4
    Electronic Resource
    Electronic Resource
    Performance of a 1.5 m augmented railgun using a permanent magnet (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 1908-1909 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A 1.5 m augmented railgun using a permanent magnet (ARGPM) has been assembled and tested. The goal of this work is to demonstrate fusion pellet injection with an extremely high velocity, in excess of 5 km/s. In this work, a wood fiber projectile is accelerated up to a velocity of 3.3 km/s in a plasma armature railgun without preaccelerators. Also, the velocity possible for a very light projectile accelerated by the ARGPM is discussed. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147625
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  • 5
    Electronic Resource
    Electronic Resource
    Early phenomena of capillary discharges for an electrothermal gun (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 1766-1768 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The 80 kJ electrothermal gun facility at Kumamoto University was assembled in order to investigate the phenomena of capillary discharges and to determine parameters of plasmas produced by a high power pulse discharge in the capillary. The behavior of capillary discharges is observed by using an image converter camera in order to make clear the early phenomena of the capillary discharge in different ambient pressures. The behavior of early capillary discharges varies from arc discharge to surface discharges with decreasing ambient pressure. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.116660
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  • 6
    Electronic Resource
    Electronic Resource
    Preparation and characterization of an Actinomyces naeslundii aggregation factor that mediates coaggregation with Porphyromonas gingivalis (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of periodontal research 33 (1998), S. 0 
    Details
    ISSN: 1600-0765
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Intergeneric coaggregation is responsible for the complexity of the microbiota in human dental plaque and is believed to be important in the initial bacterial colonization of the human oral cavity. Actinomyces naeslundii, an early colonizer of the tooth surface, may enhance subsequent colonization by Porphyromonas gingivalis which is associated with adult periodontitis. The purpose of this study was to isolate and characterize the A. naeslundii aggregation factor (AnAF) that mediates coaggregation with P. gingivalis. AnAF was isolated from A. naeslundii sonic extract (SE) by gel nitration on a Sephacryl S-400HR, by hydrophobic interaction chromatography on a HiTrap Octyl Sepharose 4FF, and by ion exchange chromatography on a HiTrap Q. The specific activity increased 12-fold with a yield of 2.5%. SDS-PAGE analysis of AnAF revealed a protein band of high molecular weight in excess of 200 kDa. Carbohydrate was detected as the only material coinciding with the protein band, indicating that the AnAF was a glycoprotein. Immunoblotting analysis indicated that AnAF directly bound to P. gingivalis cells. AnAF was sensitive to sodium metaperiodate treatment but not to heat or protease treatments. These results suggest that the AnAF carbohydrate component mediated coaggregation with P. gingivalis cells. AnAF also inhibited coaggregation with other periodontal disease-associated bacteria such as Prevotella intermedia, Fusobacterium nucleatum, Capnocytophaga ochracea, but not streptococci.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0765.1998.tb02345.x
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  • 7
    Electronic Resource
    Electronic Resource
    Expression and activity of thrombomodulin in human gingival epithelium: in vivo and in vitro studies (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: Epidermal keratinocytes thrombomodulin (TM) has been shown to regulate thrombin at sites of cutaneous injury in addition to a role for epidermal differentiation. TM, a major anticoagulant proteoglycan of the endothelial cell membrane, is a thrombin receptor that acts as a co-factor for protein C activation. Thrombin has pro-inflammatory effects for periodontitis. However, little is known about TM in gingival tissue with periodontitis. We used immunohistochemistry to examine expression of TM in gingival epithelium from patients with periodontitis. In vitro, we observed TM expression at varying Ca2+ concentrations by confocal laser scanning microscopy, examined the expression of TM mRNA and tested TM co-factor activity. Furthermore, we measured TM concentration in gingival crevicular fluid (GCF) from 11 severe adult cases of periodontitis using enzyme-linked immunosorbent assay. Immunoreactive TM was present in gingival epithelium and junctional epithelium, and was reduced in inflamed gingival epithelium compared to healthy gingival epithelium. Ultrastructurally, TM, including microvilli, was observed on the cell membrane. TM localization in cells cultured in 0.09 mm Ca2+ differed from that in cells exposed to 1.2 mm Ca2+. Northern analysis demonstrated TM mRNA in gingival keratinocytes more than in human umbilical vein endothelial cells (HUVEC). Gingival keratinocytes also facilitated protein C activation by thrombin, although less strongly than HUVEC. TM in GCF at sites with bleeding on probing in patients was significantly elevated (p〈0.001, Student's t-test). TM in gingival epithelium may regulate thrombin activity at sites of coagulation and inflammation with periodontal disease, although inflammation may impair this regulation of thrombin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1600-0765.2000.035003146.x
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