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Related Experiment Videos

Predicting soft tissue profile changes concurrent with orthodontic treatment.

F Yogosawa

    The Angle Orthodontist
    |January 1, 1990
    PubMed
    Summary
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    This study reveals how maxillary protrusion affects lower lip movement and soft tissue thickness. It also quantifies lip retraction in relation to incisor movement for predicting post-treatment facial profiles.

    Area of Science:

    • Orthodontics
    • Dentofacial Orthopedics
    • Cephalometric Analysis

    Background:

    • Soft tissue profile changes are crucial in orthodontics.
    • Understanding lip posture and response to treatment aids in predicting outcomes.

    Purpose of the Study:

    • To investigate soft tissue profile changes in relation to maxillary protrusion.
    • To correlate incisor retraction with lip retraction in treated cases.
    • To develop a framework for predicting post-treatment facial profiles.

    Main Methods:

    • Cephalometric radiographs of 50 normal occlusion adults and 50 with maxillary protrusion were analyzed.
    • Soft tissue changes were measured in relaxed and closed lip positions.
    • Post-treatment cephalometric data from 20 patients (10 maxillary, 10 bimaxillary protrusion) were examined.

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    Main Results:

    • Increased maxillary protrusion correlated with greater lower lip movement.
    • Lower lip retraction was approximately 70% of maxillary incisor retraction.
    • Maxillary protrusion cases showed slightly less soft tissue change than bimaxillary protrusion cases.

    Conclusions:

    • Lip posture and soft tissue response are key predictors of orthodontic treatment outcomes.
    • The findings provide a basis for anticipating post-treatment facial aesthetics.
    • This research aids clinicians in managing patient expectations regarding facial profile changes.