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    The Effect of Bar Design and Repetitive Loading on the Reverse Torque Values of Lateral Set Screws

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    Author
    Yahya, Jenin Hilmi
    Advisor
    Masri, Radi, 1975-
    Date
    2015
    Type
    dissertation
    
    Metadata
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    Abstract
    Statement of problem: Utilizing set screws allows easy retrieval of the prostheses with minimum cost and satisfies esthetic requirements. Set screws use is mostly governed by retrospective, anecdotal and clinical reports. The purpose was to investigate the difference in reverse torque values of fatigued one set screw or two set screws used to retain straight or curved implant prostheses in vitro. Materials and methods: Milled substructures (straight and curved) and cast superstructures retained by one or two set screws were used. There were four groups (n=8). Set screws were tested for changes in reverse torque values after simulated chewing of six months. Data (Ncm) was analyzed using 2-way ANOVA (p≤0.05). Results: No statistically significant difference in the reverse torque values between prostheses retained by one set screw and two set screws (F = 0.18, p = 0.67) or between prosthesis retained on curved bars and straight bars (F = 0.42, p = 0.52). No significant interaction was found in the reverse torque values between the number of set screws and substructure design (F = 0.32, p = 0.58). Conclusions: Under functional loading the reverse torque values are not affected by the design of the prosthesis or the number of set screws used to retain the prosthesis.
    Description
    University of Maryland, Baltimore. Biomedical Sciences-Dental School. M.S. 2015
    Keyword
    chewing simulation
    dynamic loading
    reverse torque
    set screw
    substructure
    superstructure
    Dentistry
    Identifier to cite or link to this item
    http://hdl.handle.net/10713/4625
    Collections
    Theses and Dissertations School of Dentistry
    Theses and Dissertations All Schools

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