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Root resorption in bicuspid intrusion. A scanning electron microscope study

M R Harry, M R Sims

    The Angle Orthodontist
    |July 1, 1982
    PubMed
    Summary
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    Orthodontic intrusive forces cause significant root resorption, increasing with duration and force magnitude. Cellular cementum repair occurs alongside resorption, with consistent patient responses to experimental forces.

    Area of Science:

    • Dentistry
    • Orthodontics
    • Periodontology

    Background:

    • Apical root surfaces are susceptible to resorption under orthodontic forces.
    • Understanding the biological consequences of orthodontic treatment is crucial.

    Purpose of the Study:

    • To investigate the effects of intrusive orthodontic forces on root resorption.
    • To analyze the influence of force magnitude and duration on root resorption.
    • To examine cellular cementum repair during orthodontic treatment.

    Main Methods:

    • Experimental application of intrusive forces to teeth.
    • Comparison of root resorption in experimental and control teeth.
    • Assessment of resorption over a 70-day period.

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    Main Results:

    • Intrusive forces significantly increased root resorption compared to controls.
    • Root resorption increased with force duration and, to a lesser extent, magnitude.
    • Cellular cementum repair was observed after 70 days.
    • Patient susceptibility to root resorption under experimental conditions was consistent.

    Conclusions:

    • Root resorption and repair are inherent biological responses to orthodontic treatment.
    • Force duration is a more critical factor than magnitude in causing root resorption.
    • Further understanding of the periodontium is needed to manage orthodontic treatment outcomes.