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Long-term evaluation of swallowing function before and after sagittal split ramus osteotomy.

S Namaki1, N Maekawa1, J Iwata1

  • 1Department of Oral and Maxillofacial Surgery, Nihon University School of Dentistry, Tokyo, Japan.

International Journal of Oral and Maxillofacial Surgery
|April 1, 2014
PubMed
Summary

Sagittal split ramus osteotomy (SSRO) surgery temporarily impacts swallowing function, affecting tongue, palate, and epiglottic movement. Full recovery of swallowing function is typically observed within three months post-operation.

Keywords:
hyoid boneoropharyngeal airwayorthognathic surgeryswallowing function

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Area of Science:

  • Oral and Maxillofacial Surgery
  • Swallowing Physiology
  • Orthognathic Surgery

Background:

  • Skeletal class III malocclusions often require surgical correction.
  • Sagittal split ramus osteotomy (SSRO) is a common procedure for mandibular setback.
  • The impact of SSRO on swallowing function requires detailed investigation.

Purpose of the Study:

  • To evaluate the influence of mandibular setback via SSRO on swallowing function.
  • To assess changes in hyoid bone position and oropharyngeal space post-SSRO.
  • To determine the timeline for functional recovery after SSRO.

Main Methods:

  • Prospective study of 14 patients with skeletal class III malocclusions undergoing SSRO.
  • Cephalometric analysis for morphological changes (HSN angle, sella-hyoid distance).
  • Videofluorography to assess swallowing function (lingual, soft palate, epiglottic movement, oral transit time) at multiple time points.

Main Results:

  • Significant increase in HSN angle and sella-hyoid distance at 7-10 days post-surgery, returning to baseline by 3 months.
  • Temporary decrease in lingual, soft palate, and epiglottic movement, with full recovery by 3 months.
  • Increased oral transit time observed 7-10 days post-surgery, normalizing by 3 months.

Conclusions:

  • Mandibular setback surgery using SSRO temporarily affects swallowing function.
  • Hyoid bone displacement and impaired bolus transit are transient.
  • Swallowing function demonstrates stabilization by three months after SSRO, indicating successful functional adaptation.