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Does Articular Disc Position Change Following Mandibular Setback Surgery?

Nathakarn Thamwatharsaree1, Wannakamon Panyarak2, Kittichai Wantanajittikul3

  • 1Graduate Student, Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Chiang Mai University, Chiang Mai, Thailand.

Journal of Oral and Maxillofacial Surgery : Official Journal of the American Association of Oral and Maxillofacial Surgeons
|November 22, 2023
PubMed
Summary
This summary is machine-generated.

Setback bilateral sagittal split ramus osteotomy (BSSO) surgery improved temporomandibular joint disc position in patients with mandibular prognathism. Most anterior disc displacement with reduction cases normalized, and those without reduction showed improvement post-surgery.

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Area of Science:

  • Oral and Maxillofacial Surgery
  • Orthodontics
  • Radiology

Background:

  • Maintaining condyle position after bilateral sagittal split ramus osteotomy (BSSO) is vital for preventing relapse.
  • The effect of BSSO on temporomandibular joint (TMJ) articular disc position requires further investigation.

Purpose of the Study:

  • To evaluate changes in articular disc position after setback BSSO surgery.
  • To analyze the long-term effects of BSSO on TMJ disc displacement.

Main Methods:

  • Prospective cohort study of 16 patients with mandibular prognathism undergoing setback BSSO.
  • Articular disc position assessed via MRI at 3 time points: pre-surgery, 3 months post-surgery, and 6 months post-surgery.
  • Statistical analysis using Friedman's test and Dunn-Bonferroni posthoc tests.

Main Results:

  • Significant changes in articular disc position were observed over time (P < .001).
  • The proportion of normal disc positions increased from 9.4% to 59.4% post-surgery.
  • Many cases of anterior disc displacement with reduction (ADDwR) normalized, and anterior disc displacement without reduction (ADDwoR) cases showed improved disc reduction.

Conclusions:

  • Setback BSSO surgery positively influences articular disc position in patients with mandibular prognathism.
  • The procedure appears to facilitate disc repositioning and reduction, even in cases of ADDwoR.
  • Combined orthodontic treatment and BSSO may improve TMJ disc dynamics in Class III skeletal patients.