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Related Experiment Videos

Hyoid bone position after surgical mandibular advancement.

A Gale1, P V Kilpeläinen, M T Laine-Alava

  • 1Kerava Health Centre, Finland.

European Journal of Orthodontics
|March 14, 2002
PubMed
Summary

Surgical mandibular advancement primarily moves the hyoid bone forward and upward, closely following mandibular changes. Head and hyoid bone positions show variations after surgery, with distinct vertical hyoid changes observed in females.

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Area of Science:

  • Orthodontics
  • Craniofacial Surgery
  • Cephalometric Analysis

Background:

  • Surgical mandibular advancement is a common procedure for correcting skeletal discrepancies.
  • Understanding the impact of mandibular advancement on adjacent structures like the hyoid bone and cervical spine is crucial for predicting outcomes.

Purpose of the Study:

  • To evaluate changes in hyoid bone position (horizontal and vertical) and head posture over the cervical spine after surgical mandibular advancement.
  • To assess the correlation between mandibular movement and hyoid bone displacement.
  • To identify potential gender-based differences in these positional changes.

Main Methods:

  • Cephalometric analysis of 60 patients (17 males, 43 females) before and one year after surgical mandibular advancement.

Related Experiment Videos

  • Measurement of seven linear and one angular parameter.
  • Evaluation of horizontal and vertical hyoid bone displacement and changes in head posture relative to the cervical spine.

    • Main Results:

    • The hyoid bone showed horizontal advancement in 78% of patients and vertical upward movement in 63%, moving closer to the mandible.
    • Hyoid bone displacement correlated with mandibular advancement.
    • Significant vertical hyoid changes were noted in females compared to males.
    • Head posture predominantly showed flexion (71.7%) after surgery.

    Conclusions:

    • Surgical mandibular advancement generally leads to predictable hyoid bone advancement and upward movement, closely mirroring mandibular changes.
    • While the hyoid bone's response is largely associated with mandibular movement, individual variations in hyoid and head positioning exist.
    • Gender appears to influence the extent of vertical hyoid bone changes post-surgery.