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Related Experiment Videos

Mechanics, growth, and class II corrections.

B W Hultgren, R J Isaacson, A G Erdman

    American Journal of Orthodontics
    |October 1, 1978
    PubMed
    Summary

    Orthodontic appliances alter facial growth by changing mandibular rotation and condylar growth. After treatment cessation, the facial growth pattern rebounds, often exceeding pretreatment values.

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    Area of Science:

    • Dentistry
    • Orthodontics
    • Craniofacial Biology

    Background:

    • Facial growth is influenced by mandibular rotation and condylar growth direction.
    • Orthodontic appliances are known to affect these growth parameters.

    Purpose of the Study:

    • To quantitatively assess the impact of orthodontic appliance therapy on facial growth patterns.
    • To investigate the rebound effect of facial growth after appliance therapy cessation.

    Main Methods:

    • Quantitative description of orofacial region growth using the center of mandibular rotation.
    • Analysis of the ratio of anterior facial height to posterior facial height (AFH/PFH) and condylar growth vector direction.
    • Evaluation of changes in these parameters during and after appliance therapy.

    Main Results:

    • Appliance therapy altered mandibular rotation and condylar growth direction, typically reducing anterior rotation and directing growth posteriorly.
    • Following appliance therapy, parameters returned to pretreatment values, with condylar growth becoming more anteriorly directed than before treatment.
    • These changes indicate a significant alteration and subsequent rebound of the facial growth pattern.

    Conclusions:

    • Orthodontic appliances significantly modify the facial growth pattern.
    • Upon discontinuation, the growth pattern tends to rebound to, or even surpass, pretreatment levels.

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