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    • University of Missouri-Kansas City
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    • 2014 Theses (UMKC)
    • 2014 UMKC Theses - Freely Available Online
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    Effect of Delayed Polymerization Time and Bracket Manipulation on Orthodontic Bracket Bonding

    Ponikvar, Michael J.
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    [PDF] Effect of Delayed Polymerization Time and Bracket Manipulation on Orthodontic Bracket Bonding (902.0Kb)
    Date
    2014
    Metadata
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    Abstract
    This study examined the effect of bracket manipulation in combination with delayed polymerization times on orthodontic bracket shear bond strength and degree of resin composite conversion. Orthodontics brackets were bonded to extracted third molars in a simulated oral environment after a set period of delayed polymerization time and bracket manipulation. After curing the bracket adhesive, each bracket underwent shear bond strength testing followed by micro-Raman spectroscopy analysis to measure the degree of conversion of the resin composite. Results demonstrated the shear bond strength and the degree of conversion of ceramic brackets did not vary over time. However, with stainless steel brackets there was a significant effect (p ≤ 0.05) of delay time on shear bond strength between the 0.5 min and 10 min bracket groups. In addition, stainless steel brackets showed significant differences related to degree of conversion over time between the 0.5 min and 5 min groups, in addition to the 0.5 min and 10 min groups. This investigation suggests that delaying bracket adhesive polymerization up to a period of 10 min then adjusting the orthodontic bracket may increase both shear bond strength and degree of conversion of stainless steel brackets while having no effect on ceramic brackets.
    Table of Contents
    Introduction -- Materials and methods -- Results -- Discussion -- Conclusions
    URI
    https://hdl.handle.net/10355/45629
    Degree
    M.S.
    Thesis Department
    Oral and Craniofacial Sciences (UMKC)
    Collections
    • Dentistry Electronic Theses and Dissertations (UMKC)
    • 2014 UMKC Theses - Freely Available Online

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