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Related Experiment Videos

The mandibular plane angle in activator treatment.

H Pancherz

    The Angle Orthodontist
    |January 1, 1979
    PubMed
    Summary

    Activator treatment improved incisor relationships in patients with small or large mandibular plane angles. Relapse was more common in large angle cases, often due to unfavorable mandibular growth and tongue function.

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    Area of Science:

    • Orthodontics
    • Craniofacial Growth

    Background:

    • The effectiveness of activator treatment for correcting sagittal and vertical discrepancies in patients with varying mandibular plane angles requires further long-term evaluation.
    • Understanding relapse patterns associated with different pretreatment mandibular plane angles is crucial for optimizing orthodontic outcomes.

    Purpose of the Study:

    • To investigate the long-term results of activator treatment in subjects with small and large pretreatment mandibular plane angles.
    • To identify factors influencing treatment success and relapse in these patient groups.

    Main Methods:

    • Longitudinal study analyzing 15 subjects with small and 13 subjects with large pretreatment mandibular plane angles.
    • Assessment of incisor relationships, overjet, overbite, arch width, and crowding.
    • Evaluation of relapse frequency and contributing factors during the follow-up period.

    Main Results:

    • Activator treatment generally improved sagittal and vertical incisor relationships in both groups.
    • Large angle cases showed higher overjet relapse and increased open bite frequency.
    • Small angle cases exhibited less overjet relapse and decreased open bite frequency.
    • Mandibular crowding and reduced intercanine arch width were more prevalent in the large angle group.
    • Pretreatment mandibular plane angle alone was not the primary cause of treatment failure.

    Conclusions:

    • Activator treatment offers general improvements for both small and large mandibular plane angle cases.
    • Unfavorable mandibular growth and atypical tongue function were identified as key factors for relapse in large angle subjects.
    • Orthodontic treatment planning should consider mandibular growth patterns and tongue function, especially in patients with large mandibular plane angles.

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