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Parameters determining micromotion at the implant-abutment interface.

Matthias Karl, Thomas D Taylor

    The International Journal of Oral & Maxillofacial Implants
    |November 15, 2014
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    Micromotion at the implant-abutment interface varies widely. Factors like tightening torque and abutment material significantly influence micromotion, crucial for long-term dental implant success.

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    Area of Science:

    • Dental Implantology
    • Biomaterials Science
    • Mechanical Engineering

    Background:

    • Micromotion at the implant-abutment interface is a critical factor influencing the long-term success of dental implants.
    • Excessive micromotion can lead to technical complications such as screw loosening and screw fracture.

    Purpose of the Study:

    • To quantify and compare the micromotion of various implant-abutment combinations under cyclic loading.
    • To investigate the influence of implant shoulder design, abutment fabrication, and antirotational features on micromotion.

    Main Methods:

    • Implant-abutment assemblies were subjected to cyclic loading (200 N, 10 cycles) at a 30-degree angle in a universal testing machine.
    • Relative displacement (micromotion) was measured using extensometers and analyzed with Welch's t tests.
    • Micromotion was recorded over five consecutive loading cycles for statistical analysis.

    Main Results:

    • Micromotion values ranged from 1.52 to 94.00 μm, with significant effects observed for tightening torque.
    • Lack of antirotational feature engagement increased micromotion; cast gold abutments showed less micromotion than copy-milled and stock abutments.
    • CAD/CAM zirconia abutments demonstrated less micromotion than CAD/CAM titanium abutments, with significant variations noted for clone systems and competing implant/abutment combinations.

    Conclusions:

    • A wide spectrum of micromotion was observed across the tested implant-abutment configurations.
    • No single implant shoulder geometry or fabrication method completely eliminated detectable micromotion.