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    • University of Missouri-Kansas City
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    • Theses and Dissertations (UMKC)
    • Theses (UMKC)
    • 2011 Theses (UMKC)
    • 2011 UMKC Theses - Freely Available Online
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    The effect of simulated oral and clinical conditions on the fracture strength of ceramic bracket tie-wings

    Darmitzel, Stephen Edward, 1981-
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    [PDF] DarmitzelEffSimOra.pdf (2.129Mb)
    Date
    2011-08-12
    Format
    Thesis
    Metadata
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    Abstract
    This study examined the effect of simulated oral and clinical conditions on the tie-wing fracture strength of a polycrystalline and a monocrystalline bracket. Fracture strength was measured for brackets as-received (control) and after 7- or 21-day exposure to phosphate buffered saline solution (PBS) with or without repetitive ligation. Scanning electron microscopy was used for qualitative evaluation of the fractured brackets. Based on a two-factor ANOVA and Dunnett's post hoc test ( = 0.05), monocrystalline bracket tie-wing fracture strength was significantly decreased as a function of PBS storage over time with and without ligation, while there was no significant effect on the polycrystalline bracket tie-wing fracture strength. With monocrystalline brackets, tie-wing fracture origin appeared to differ between brackets exposed to repetitive ligation and those with no ligation. The results suggest that monocrystalline bracket tie-wing fracture strength is more susceptible to degradation in the oral environment.
    Table of Contents
    Introduction -- Materials and Methods -- Results -- Discussion -- Conclusions
    URI
    http://hdl.handle.net/10355/11361
    Degree
    M.S.
    Thesis Department
    Oral Biology (UMKC)
    Collections
    • Dentistry Electronic Theses and Dissertations (UMKC)
    • 2011 UMKC Theses - Freely Available Online

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