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Related Experiment Videos

Third molar impaction in extraction cases treated with the Begg technique

D Erdem1, E Ozdiler, U T Memikoğlu

  • 1Department of Orthodontics, University of Ankara, Turkey.

European Journal of Orthodontics
|August 12, 1998
PubMed
Summary

This study compared patients with erupted versus impacted mandibular third molars undergoing orthodontic treatment. Vertical condylar growth and mesial inclination of third molars influenced eruption outcomes.

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Area of Science:

  • Dentistry
  • Orthodontics
  • Oral Surgery

Background:

  • Mandibular third molars (wisdom teeth) eruption is influenced by various factors.
  • Understanding these factors is crucial for orthodontic treatment planning.
  • Distinguishing between erupted and impacted mandibular third molars pre-treatment aids in predicting outcomes.

Purpose of the Study:

  • To investigate differences in cephalometric and radiographic measurements between patients with erupted and impacted mandibular third molars.
  • To analyze the influence of orthodontic treatment (Begg appliance) on these differences.
  • To identify pre-treatment indicators associated with mandibular third molar eruption or impaction.

Main Methods:

  • Comparative analysis of 27 patients (14 erupted, 13 impacted mandibular third molars) before and after orthodontic treatment.

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  • Utilized Begg appliances following first premolar extraction.
  • Collected lateral cephalometric films, peri-apical radiographs, orthopantomographs, and dental casts.
  • Performed 13 cephalometric measurements.

    • Main Results:

    • Pre-treatment: Erupted group showed more vertical growth, smaller mandibular arc angle, upright lower third molars, and greater distance between second molars and the ramus center (Xi).
    • During treatment: Vertical condylar growth correlated with reduced likelihood of third molar eruption.
    • Mesial inclination of mandibular third molars was associated with impaction tendency.

    Conclusions:

    • Cephalometric and radiographic features can differentiate between patients with erupted and impacted mandibular third molars.
    • Vertical condylar growth and third molar mesial inclination are significant factors in eruption and impaction.
    • Findings aid in predicting mandibular third molar behavior during orthodontic interventions.