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Related Experiment Videos

How predictable is orthognathic surgery?

Charlotte E Eckhardt1, Susan J Cunningham

  • 1Orthodontic Department, Eastman Dental Institute, University College London, UK.

European Journal of Orthodontics
|June 30, 2004
PubMed
Summary
This summary is machine-generated.

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Orthognathic treatment planning predictions, comparing manual techniques and the OPAL computer program, show similar accuracy for mandibular surgery but manual planning is more accurate for bimaxillary surgery, especially for lip profile prediction.

Area of Science:

  • Orthodontics and Maxillofacial Surgery
  • Dental Imaging and Cephalometrics

Background:

  • Accurate prediction of soft tissue profile remains a challenge in orthognathic treatment planning.
  • Existing planning techniques rely on skeletal patterns and dentition position but struggle with soft tissue outcomes.

Purpose of the Study:

  • To compare the predictive accuracy of the manual 'hand planning' technique versus the Orthognathic Planning and Analysis (OPAL) computer program for orthognathic surgery outcomes.
  • To specifically evaluate the prediction accuracy of soft tissue profiles in Class II and Class III surgical patients.

Main Methods:

  • Retrospective cephalometric analysis of 70 adult patients (Class II mandibular advancement, Class III bimaxillary surgery).
  • Calculation of actual surgical and orthodontic movements from pre- and post-treatment lateral cephalograms.

Related Experiment Videos

  • Generation of treatment predictions using both hand planning and OPAL, followed by comparison with actual outcomes.

    • Main Results:

    • Both methods exhibited significant individual variation in prediction accuracy.
    • For mandibular advancement, hand planning and OPAL showed comparable accuracy.
    • In bimaxillary surgery, hand planning demonstrated higher accuracy than OPAL, particularly for predicting lip profile changes.

    Conclusions:

    • While both methods have limitations, manual planning may offer superior accuracy for soft tissue profile prediction in bimaxillary orthognathic surgery.
    • Treatment outcome predictions should be interpreted with caution due to inherent individual variability.