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Related Experiment Videos

Skeletal fixation versus skeletal relapse.

E Komori1, K Aigase, M Sugisaki

  • 1Department of Dentistry, Jikei University, Tokyo, Japan.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|November 1, 1987
PubMed
Summary
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Skeletal fixation using wires improved chin position stability after mandibular prognathism surgery. However, persistent posterior mandibular shifts and tooth intrusion suggest other factors influence instability.

Area of Science:

  • Oral and Maxillofacial Surgery
  • Orthodontics
  • Skeletal Biomechanics

Background:

  • Mandibular prognathism correction often involves sagittal split ramus osteotomy.
  • Maintaining skeletal stability post-surgery is crucial for long-term outcomes.
  • Intermaxillary fixation is standard, but additional skeletal fixation methods warrant investigation.

Purpose of the Study:

  • To evaluate the efficacy of skeletal fixation in enhancing skeletal stability.
  • To compare relapse patterns between patients with and without skeletal fixation.
  • To identify factors contributing to postoperative skeletal instability.

Main Methods:

  • Modified sagittal split ramus osteotomy for mandibular prognathism.
  • Skeletal fixation group (S group) used maxillary peralveolar and circummandibular wires.

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  • Control group (C group) had no skeletal fixation.
  • Cephalometric analysis was used for comparison.

    • Main Results:

    • Skeletal fixation significantly improved retention of the corrected chin position.
    • Downward/backward rotation of the distal mandibular fragment and incisor extrusion were controlled.
    • Persistent upward shift of the posterior distal fragment occurred, causing posterior tooth intrusion, even with fixation.

    Conclusions:

    • Skeletal fixation aids in maintaining mandibular position after surgery.
    • The pterygomasseteric sling tension may be a significant factor in postoperative skeletal instability.
    • Further research is needed to address persistent posterior segment instability.