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Related Experiment Videos

A comparison of lower face changes.

A E Phelps

    The Angle Orthodontist
    |October 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Preparing anchorage with Class III elastics before Class II elastics resulted in significant facial changes. These included mandibular plane flattening and enhanced lower incisor and midface retraction, aligning with natural facial growth.

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    Area of Science:

    • Orthodontics
    • Craniofacial Growth
    • Dental Biomechanics

    Background:

    • Class II malocclusion treatment often requires managing anchorage to achieve desired outcomes.
    • The sequence of applying orthodontic mechanics can influence treatment results and facial profile.
    • Understanding anchorage preparation's impact is crucial for optimizing orthodontic treatment strategies.

    Purpose of the Study:

    • To compare the effects of pre-emptive anchorage preparation (Class III elastics) versus conventional Class II elastic mechanics alone.
    • To evaluate the influence of anchorage preparation on specific craniofacial and dental changes.
    • To assess if anchorage preparation modifies outcomes consistent with normal facial growth.

    Main Methods:

    • Comparative study design analyzing two groups of orthodontic patients.

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  • Group 1: Received deliberate anchorage preparation (Class III elastics) prior to Class II elastics.
  • Group 2: Received Class II elastics only. Both groups used extraoral traction as needed, with comparable appliances, age, sex, and malocclusion severity.

    • Main Results:

    • Anchorage-prepared cases exhibited a flattened mandibular plane angle.
    • Greater retraction of the lower incisors was observed in the anchorage-prepared group.
    • Increased midface retraction and lower face protraction were noted in cases with prior anchorage preparation.

    Conclusions:

    • Deliberate anchorage preparation prior to Class II elastic mechanics significantly alters the craniofacial complex.
    • Observed changes, including mandibular plane flattening and enhanced incisor/midface retraction, align with typical facial growth patterns.
    • Pre-emptive anchorage preparation offers a viable strategy to influence treatment outcomes and achieve specific facial profile modifications.