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Predicting the Future Focus of Orthognathic Surgery: Outcome-Driven Planning and Treatment With Function, Esthetics, and Occlusion as Key Indicators.

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Unilateral sagittal split mandibular ramus osteotomy: indications and geometry.

Jacques Beukes1, Johan P Reyneke2, Janalt Damstra3

  • 1Centre for Orthognathic Surgery and Implantology, Netcare Sunninghill, Cnr Witkoppen and Nanyuki rd, Sunninghill Park.

The British Journal of Oral & Maxillofacial Surgery
|January 18, 2016
PubMed
Summary

Unilateral sagittal split ramus osteotomy (USSO) effectively corrects small mandibular asymmetries. Post-operative analysis revealed minor condyle rotation, with no adverse long-term effects on the temporomandibular joint (TMJ).

Keywords:
Unilateral Sagittal Split Mandibular Ramus Osteotomy

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Area of Science:

  • Oral and Maxillofacial Surgery
  • Orthodontics
  • Biomedical Engineering

Background:

  • Mandibular asymmetries, often subtle, require precise surgical correction.
  • Unilateral sagittal split ramus osteotomy (USSO) is a common procedure for addressing these asymmetries.
  • Understanding the geometric and functional outcomes of USSO is crucial for patient care.

Purpose of the Study:

  • To quantify geometric changes in the mandibular condyle and lower incisors after USSO.
  • To evaluate the long-term effects of USSO on temporomandibular joint (TMJ) health in patients.

Main Methods:

  • Geometric analysis of mandibular condyle and lower incisor rotation in 26 patients undergoing USSO.
  • Clinical examination of TMJ in 23 patients post-USSO to assess long-term adverse effects.

Main Results:

  • USSO successfully corrected small mandibular asymmetries (<5mm).
  • Minor rotational changes in the mandibular condyle were observed.
  • No significant long-term adverse effects on the TMJ were identified.

Conclusions:

  • USSO is a viable treatment for small mandibular asymmetries.
  • Anteroposterior changes require consideration during surgical planning.
  • The procedure demonstrates a favorable long-term safety profile for the TMJ.