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Related Experiment Videos

Cases six years postretention.

K C Johnson

    The Angle Orthodontist
    |July 1, 1977
    PubMed
    Summary
    This summary is machine-generated.

    This study on orthodontic treatment found that cuspid and molar widths typically decrease post-treatment. Lower arch crowding may result from expanded cuspids and incisor positioning.

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    Area of Science:

    • Orthodontics
    • Dental Morphology

    Background:

    • Understanding changes in dental arch dimensions during and after orthodontic treatment is crucial for stable outcomes.
    • Cephalometric analysis provides quantitative data on craniofacial and dental relationships.

    Observation:

    • Cuspid width showed a decrease in 9 out of 11 cases post-treatment, with a slight increase in 2 cases.
    • Molar width demonstrated a consistent decrease from treatment initiation through the post-retention phase.
    • Cephalometric measurements in the sample aligned with established norms and age-related changes.

    Findings:

    • Orthodontic treatment often leads to a reduction in cuspid and molar widths.
    • Lower arch crowding can be attributed to factors including expanded cuspids, protrusive mandibular incisors, and late skeletal growth.

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  • The observed cephalometric changes are consistent with normative data.

    • Implications:

    • Findings suggest that arch width reduction is a common outcome of orthodontic interventions.
    • Understanding the etiology of lower arch crowding is essential for effective treatment planning and relapse prevention.
    • The study validates the use of specific cephalometric norms for assessing treatment outcomes in stable occlusions.