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Related Experiment Videos

Factors contributing to relapse in rigidly fixed mandibular setbacks.

J E Franco1, J E Van Sickels, W J Thrash

  • 1Department of Oral and Maxillofacial Surgery, University of Texas Health Science Center, San Antonio 78284-7908.

Journal of Oral and Maxillofacial Surgery : Official Journal of the American Association of Oral and Maxillofacial Surgeons
|May 1, 1989
PubMed
Summary

Mandibular setback surgery can lead to relapse, especially in two-jaw procedures. The extent of the setback and changes in the jaw

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Area of Science:

  • Oral and Maxillofacial Surgery
  • Orthognathic Surgery
  • Craniofacial Anatomy

Background:

  • Mandibular setback surgery using bilateral sagittal split osteotomy (BSSO) with rigid fixation is a common procedure.
  • Relapse after orthognathic surgery can impact functional and aesthetic outcomes.
  • Understanding factors influencing relapse is crucial for surgical planning and patient counseling.

Purpose of the Study:

  • To investigate the incidence and predictors of relapse following mandibular setback surgery.
  • To compare relapse rates between single-jaw and two-jaw procedures.
  • To identify specific surgical factors associated with postoperative relapse.

Main Methods:

  • Retrospective review of cephalometric radiographs from 25 patients undergoing BSSO for mandibular setback.

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  • Data collected preoperatively, immediately postoperatively, and 6 months to 3 years after surgery.
  • Regression analysis to identify factors predicting relapse, defined as forward pogonion movement.

    • Main Results:

    • Overall relapse rates were 43.7% for single-jaw and 53.4% for two-jaw procedures.
    • Magnitude of mandibular setback significantly predicted relapse in single-jaw cases.
    • Alteration of the proximal segment was the primary predictor of relapse in two-jaw cases.
    • Forward rotation of the mandible (chin point) was observed even with good occlusal results.

    Conclusions:

    • Relapse is a significant concern after mandibular setback surgery, particularly in two-jaw procedures.
    • Surgical planning must consider the magnitude of setback and proximal segment alterations to minimize relapse.
    • Muscular tissue dynamics may play a role in the observed relapse patterns.