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Related Experiment Videos

Rotation of rectangular wire in rectangular molar tubes. Part I

E Raphael, J L Sandrik, L Klapper

    American Journal of Orthodontics
    |August 1, 1981
    PubMed
    Summary
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    Orthodontic wire rotation in molar tubes varies significantly. Square wires showed minimal binding, but rectangular wires experienced unexpected rotation, limiting precise torque control in clinical applications.

    Area of Science:

    • Biomaterials Science
    • Orthodontics
    • Mechanical Engineering

    Background:

    • Accurate torque control is crucial in orthodontics for effective tooth movement.
    • Molar tubes and orthodontic wires are key components influencing torque application.
    • Previous studies have not fully quantified wire rotation within various tube types.

    Purpose of the Study:

    • To measure the angular rotation of orthodontic wires within rectangular molar tubes.
    • To compare experimental findings with theoretical predictions and clinical expectations.
    • To assess the feasibility of achieving precise torque control in orthodontic treatment.

    Main Methods:

    • Utilized a rotatable mechanical stage on a Unitron metallograph for precise measurements.
    • Tested square 0.016-inch and rectangular 0.016x0.022-inch wires.

    Related Experiment Videos

  • Compared wire rotation in mandrel-formed, Inconel-formed, and cast molar tubes.

    • Main Results:

    • Square 0.016-inch wire exhibited minimal binding in 0.018x0.022-inch tubes.
    • Significant rotations (11-23 degrees) were observed for square wires in cast tubes.
    • Rectangular wires showed greater-than-expected rotation in tested tubes, exceeding theoretical and clinical predictions.

    Conclusions:

    • Achieving fine torque control of a few degrees is often unrealistic in clinical orthodontics.
    • The interaction between wire dimensions and molar tube manufacturing affects rotational behavior.
    • Current theoretical models may not fully capture the complex mechanics of wire-tube engagement.