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Related Experiment Videos

Effect of mandibular setback surgery on occlusal force

Y G Kim1, S H Oh

  • 1Department of Oral and Maxillofacial Surgery, College of Dentistry, Kyung Hee University, Seoul, Korea.

Journal of Oral and Maxillofacial Surgery : Official Journal of the American Association of Oral and Maxillofacial Surgeons
|February 1, 1997
PubMed
Summary

Mandibular setback surgery initially reduces bite force, but it recovers significantly over 12 months. Avoiding prolonged maxillo-mandibular fixation (MMF) aids faster bite force recovery after orthognathic surgery.

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Area of Science:

  • Oral and Maxillofacial Surgery
  • Orthognathic Surgery
  • Biomechanics

Background:

  • Mandibular prognathism requires surgical correction.
  • Orthognathic surgery impacts occlusal force.
  • Understanding postsurgical recovery is crucial.

Purpose of the Study:

  • Investigate the effect of mandibular setback surgery on occlusal force.
  • Evaluate factors influencing postsurgical bite force changes.
  • Correlate changes with surgical method, fixation duration, and muscle mechanics.

Main Methods:

  • Measured maximal molar bite force in 26 patients pre- and post-surgery (MMF removal, 3, 6, 12 months).
  • Analyzed cephalometric tracings to correlate bite force with skeletal changes.
  • Statistically analyzed data to identify influencing factors.

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Main Results:

  • Mean bite force decreased from 13.7 kg pre-surgery to 7.6 kg at MMF removal, then increased to 26.1 kg at 12 months.
  • Bite force recovery correlated positively with mandibular plane angle and body length changes.
  • Type of operation and MMF duration significantly affected bite force recovery.

Conclusions:

  • Prolonged maxillo-mandibular fixation (MMF) hinders bite force recovery.
  • Minimizing MMF duration and preventing masticatory muscle injury can hasten recovery.
  • Optimizing surgical techniques improves functional outcomes after orthognathic surgery.