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Post-treatment Stability in Angle Class III Cases.

Jun Yoshizumi1, Kenji Sueishi

  • 1Department of Orthodontics, Tokyo Dental College.

The Bulletin of Tokyo Dental College
|March 11, 2016
PubMed
Summary

Orthodontic treatment stability in Angle Class III cases varies by method. Non-extraction cases show the highest stability, while surgical interventions result in the lowest post-treatment stability, indicating greater relapse potential.

Area of Science:

  • Orthodontics
  • Dental Research
  • Craniofacial Development

Background:

  • Angle Class III malocclusion presents unique challenges in achieving stable post-treatment results.
  • Understanding treatment modality effects on long-term stability is crucial for clinical decision-making.

Purpose of the Study:

  • To compare the post-treatment stability of Angle Class III malocclusion based on treatment approach: extraction, non-extraction, or surgical.
  • To evaluate the influence of different orthodontic interventions on long-term occlusal and skeletal stability.

Main Methods:

  • Retrospective study of 27 Angle Class III patients categorized into extraction, non-extraction, and surgical groups.
  • Assessment of post-treatment stability using ABO Model Grading System, Gottlieb's Grading Analysis, Little's Irregularity Index, and ANB angle at baseline, post-treatment, and post-retention.

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  • Statistical analysis using the Kruskal-Wallis test to compare stability across groups.

    • Main Results:

    • Non-extraction cases demonstrated the highest post-treatment stability, while surgical cases showed the lowest, correlating with ANB angle changes.
    • A greater amount of change in the ANB angle from baseline to post-treatment was associated with increased relapse in surgical cases.
    • Non-extraction cases exhibited the most significant relapse of lower incisors, as indicated by the Little's Irregularity Index.

    Conclusions:

    • Treatment modality significantly impacts post-treatment stability in Angle Class III malocclusion.
    • Non-extraction therapy offers superior stability, whereas surgical correction is associated with a higher tendency for relapse.
    • Further research is warranted to optimize treatment strategies for maximizing long-term stability in Angle Class III patients.