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Related Experiment Videos

Stability of maxillary surgery in openbite versus nonopenbite malocclusions.

T F Denison1, V G Kokich, P A Shapiro

  • 1Dept. of Orthodontics, School of Dentistry, University of Washington, Seattle 98105.

The Angle Orthodontist
|January 1, 1989
PubMed
Summary

Maxillary repositioning via LeFort I osteotomy shows varying post-treatment stability. Patients with pretreatment openbite experienced significant changes, unlike those with normal or complete overbite, indicating potential instability in specific cases.

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Area of Science:

  • Orthognathic Surgery
  • Craniofacial Surgery
  • Orthodontics

Background:

  • LeFort I osteotomy is a surgical procedure to reposition the maxilla.
  • Superior repositioning of the maxilla is performed to correct various skeletal discrepancies.
  • Understanding post-treatment stability is crucial for successful surgical outcomes.

Purpose of the Study:

  • To evaluate the post-treatment stability of patients undergoing superior LeFort I osteotomy.
  • To compare stability based on the degree of pretreatment overbite.
  • To identify factors influencing relapse or adaptation after maxillary advancement.

Main Methods:

  • Lateral cephalometric radiographs of 66 patients were analyzed.
  • Patients were categorized into three groups based on pretreatment overbite: openbite, overlap, and contact.

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  • Cephalograms were superimposed to measure changes at pretreatment, posttreatment, and >1 year posttreatment.

    • Main Results:

    • The openbite subsample exhibited significant post-treatment changes, including increased facial height and molar eruption.
    • A subset of the openbite and overlap subsamples showed incisor eruption without overbite change.
    • The contact subsample demonstrated no significant post-treatment skeletal alterations.

    Conclusions:

    • Post-treatment stability after superior LeFort I osteotomy varies significantly with the degree of pretreatment overbite.
    • Patients with pretreatment openbite are more susceptible to relapse or adaptive changes.
    • Further investigation into the etiology of instability in openbite cases is warranted.