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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

    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.

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    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.

    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.

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