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Related Experiment Videos

Changes in condylar position following bilateral sagittal split ramus osteotomy with setback

A E Magalhães1, J P Stella, T H Tahasuri

  • 1Department of Oral and Maxillofacial Surgery, John Peter Smith Hospital, Fort Worth, TX 76104, USA.

The International Journal of Adult Orthodontics and Orthognathic Surgery
|January 1, 1995
PubMed
Summary

Bilateral sagittal split ramus osteotomy (BSSO) causes unpredictable condylar position changes. Mandibular morphology and setback magnitude did not significantly correlate with these post-surgery condylar position alterations.

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Area of Science:

  • Oral and Maxillofacial Surgery
  • Orthognathic Surgery
  • Anatomy

Background:

  • Bilateral sagittal split ramus osteotomy (BSSO) is a common orthognathic procedure.
  • Understanding condylar repositioning after BSSO is crucial for surgical outcomes.
  • Variability in condylar behavior can impact functional and aesthetic results.

Purpose of the Study:

  • To assess condylar position changes after BSSO with 5-mm and 10-mm setbacks.
  • To investigate the influence of mandibular morphology and setback magnitude on condylar behavior.
  • To analyze the three-dimensional movements of condyles and proximal segments post-osteotomy.

Main Methods:

  • Utilized a Plexiglas device for precise measurement of mandibular morphology and segment movements.

Related Experiment Videos

  • Performed bilateral sagittal split ramus osteotomy with distinct setback distances (5 mm and 10 mm) in human cadaver mandibles.
  • Analyzed condylar and proximal segment positions in coronal and axial planes before and after surgical intervention.

    • Main Results:

    • No statistically significant correlation was found between mandibular morphology or setback size and postsurgical condylar position changes.
    • Condyles and rami exhibited highly variable tipping in the coronal plane.
    • Anterior rotation of the lateral pole of condyles was predominant in the axial plane, with greater rotation on the left side.

    Conclusions:

    • Condylar and proximal segment repositioning following BSSO is highly variable and unpredictable.
    • The magnitude of mandibular setback and baseline mandibular morphology do not reliably predict condylar behavior.
    • These findings highlight the inherent unpredictability in condylar response to BSSO, irrespective of surgical parameters.