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  • 1
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The aim of this study was to compare the effects upon marginal leakage of a number of dentine bonding agents: Gluma, Scotchbond, Topaz and an experimental material when used with a posterior composite resin, Occlusin. The results were also compared with composite used without a dentine bonding agent and with a glass ionomer, Chemfil II.Class V cavities with or without a bevelled cavo-surface margin were prepared in the buccal surfaces of extracted premolar teeth. Following restoration, the teeth were stored for periods of up to 3 months and then thermally cycled. Marginal leakage was subsequently determined using a radioactive isotope containing 45Ca, and an autoradiographic technique. Image analysis was used to determine the total amount of linear leakage for each specimen. The results showed that some leakage occurred for all materials at each time interval. The bevelled design of cavity allowed significantly less leakage than the non-bevelled type. The use of dentine bonding agents did not improve the marginal seal of the composite restorations, and the glass ionomer restorations showed significantly less leakage than the composite resin and dentine bonding agent combinations.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The initial aim of this study was to investigate the effect of saliva and the formation of pellicle on the fluoride release in vitro of the glass–ionomer filling material, Chemfil Superior®. For the first study glass–ionomer discs of 6 mm in diameter and 1·5 mm thick were made. Ten discs were immersed in whole stimulated saliva each day for 10 min and 10 control discs were immersed in deionized water. For the remaining 23 h and 50 min of each day, over the 20-day experimental period, both test and control discs were placed in deionized water. A considerable amount of fluoride was released on the first day (14·5 ppm F control and 13·3 ppm F test). The concentration of fluoride released on the second day fell sharply to 5·3 ppm F for controls and 4·9 ppm F for tests. This release had almost reached a plateau by day 10 and at day 20 the pellets continued to release low levels of fluoride. The concentration of fluoride released was only slightly higher for controls than for test discs when both were immersed in deionized water until day 20. However, during the 10-min period between 1·5 and 2 times as much fluoride was released into the deionized water as into saliva until day 20 when the ratio fell to 1·2:1. The second experiment assessed fluoride release when specimens were incubated for 1 h using an identical protocol. Again, less fluoride was released from the saliva-coated specimens compared with the controls (17%), which was not substantially different to the comparable 10-min samples (13%). This study indicates that saliva retards the release of fluoride from glass–ionomer and that this retarding effect is still present when discs are subsequently immersed in water compared with those that were placed in water alone. This suggests that salivary deposits have formed within minutes of immersion in saliva. This retarding effect was observed throughout the study period with the exception of the 20-day samples which had been incubated in saliva for 10 min.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Dental traumatology 11 (1995), S. 0 
    ISSN: 1600-0595
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract The purpose of this study was to assess long-term coronal leakage in root fillings achieved by 2 gutta-percha techniques using 2 calcium hydroxide-containing sealers. The root canals of 90 single-rooted teeth with mature apices were prepared chemo-mechanically. The teeth were placed randomly into four experimental groups (n = 20) and obturated with either lateral condensation of cold gutta-percha or a thermo-plasticized gutta-percha delivery system, JS Quickfill, using Sealapex or Apexit as the sealer. A further five teeth were placed in each of negative or positive control groups. After root filling the teeth were sectioned at the cementoenamel junction and stored in saline solution at 37° for 1 yr. Coronal leakage was then determined with an India ink tracer (using a reduced pressure model) and a clearing technique. The extent of coronal leakage was measured at ×6 magnification. Non-parametric analysis showed that there was significantly more leakage with the thermally softened gutta-percha technique than with lateral condensation (p〈0.05). There was no significant difference in leakage between the groups obturated with lateral condensation (p〉0.005) but, with the thermoplasticized technique, there was more leakage with the sealer Sealapex (p〈0.05).
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Dental traumatology 10 (1994), S. 0 
    ISSN: 1600-0595
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract This paper reviews the evidence that coronal leakage of root canals may lead to failure of root-canal therapy. The causes of coronal leakage and methods by which this leakage may be prevented are described.
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  • 5
    ISSN: 1600-0595
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract This in vitro study investigated the effect of long-term storage on the coronal leakage of a microbial marker in teeth root-filled with lateral condensation of cold gutta-percha and one of two sealers. Sixty single-rooted teeth were prepared chemomechanically to a size 40 master apical file. The teeth were divided into two groups of 20 teeth each and obturated with gutta-percha using either Apexit or Tubliseal EWT sealer. The teeth were stored for 6 months in artificial saliva and tested for leakage using a marker consisting of Anaerobic streptococci and Prevotella intermedia. The teeth were checked for bacterial leakage daily for 90 days. All positive control teeth leaked within 48 hours, while the negative control teeth remained uncontaminated throughout the test period. Leakage in the experimental teeth started at times varying from 10 to 71 days; 30% and 75% of the specimens of the Apexit and Tubliseal EWT groups respectively showed leakage at 90 days. The Tubliseal EWT group showed significantly more leakage (p〈0.05) than the Apexit group.
    Type of Medium: Electronic Resource
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