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Related Experiment Video

Updated: Jul 9, 2026

Measuring Maxillary Posterior Tooth Movement: A Model Assessment using Palatal and Dental Superimposition
07:32

Measuring Maxillary Posterior Tooth Movement: A Model Assessment using Palatal and Dental Superimposition

Published on: February 23, 2024

[Interceptive treatment with the DAC appliance: structural analysis].

Sarah Gebeile-Chauty1, Jean-Antoine Archer, Alain Lautrou

  • 1Département d'Orthopédie Dento-Faciale, Faculté d'Odontologie, rue Guillaume Paradin, 69372 Lyon Cedex 08, France. schauty@tiscali.fr

L' Orthodontie Francaise
|December 18, 2007
PubMed
Summary
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Early Class II treatment with the DAC appliance significantly boosted mandibular growth, correcting overjet primarily through skeletal changes. Some relapse occurred post-treatment, typical for orthodontic interventions.

Area of Science:

  • Dentistry
  • Orthodontics
  • Craniofacial Growth

Background:

  • Class II malocclusion is common, often involving mandibular retrognathism.
  • Early intervention aims to modify skeletal growth patterns.
  • The Distal Jet (DJ) appliance is one option for Class II correction.

Purpose of the Study:

  • To evaluate the dental and skeletal effects of early Class II treatment using the DAC appliance.
  • To compare outcomes between treated and untreated groups.
  • To assess treatment stability over a 28-month follow-up period.

Main Methods:

  • Retrospective study of 30 subjects treated with the DAC appliance and 32 controls.
  • Cephalometric analysis (L.D.V. and Tweed) of lateral roentgenograms at baseline, post-treatment, and 28 months post-treatment.

Related Experiment Videos

Last Updated: Jul 9, 2026

Measuring Maxillary Posterior Tooth Movement: A Model Assessment using Palatal and Dental Superimposition
07:32

Measuring Maxillary Posterior Tooth Movement: A Model Assessment using Palatal and Dental Superimposition

Published on: February 23, 2024

  • Statistical comparison of cephalometric variables between groups using t-tests.

    • Main Results:

    • The DAC appliance group exhibited approximately double the mandibular growth compared to the control group.
    • Overjet correction was achieved with 89% skeletal and 11% dental contribution.
    • Anterior skeletal and matricial rotations were comparable between groups.
    • Partial relapse of overjet was observed during the follow-up stage.

    Conclusions:

    • The DAC appliance is an effective orthopedic device for correcting Class II malocclusion characterized by mandibular retrognathism without maxillary prognathism.
    • Early treatment with the DAC appliance promotes significant mandibular growth.
    • Treatment stability requires further investigation, as partial relapse can occur.