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Evaluation of mandibular angle ostectomy using three-dimensional finite element analysis.

Jian Song1, Songsong Zhu, En Luo

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Mandibular angle ostectomy (MAO) alters mandible biomechanics, increasing stress and decreasing displacement at the angle. This may affect fracture risks, with higher condyle and lower angle fracture rates post-MAO.

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Area of Science:

  • Biomechanical Engineering
  • Oral and Maxillofacial Surgery
  • Computational Anatomy

Background:

  • Mandibular angle ostectomy (MAO) is a surgical procedure to reshape the mandible.
  • Understanding the biomechanical changes after MAO is crucial for predicting surgical outcomes and potential complications.

Purpose of the Study:

  • To investigate stress and displacement distributions in the mandible following MAO using 3D finite element analysis.
  • To analyze the biomechanical impact of MAO under various functional loading conditions.

Main Methods:

  • Generation of 3D finite element models from helical CT scans of a patient undergoing MAO.
  • Simulation of muscle forces and three biting conditions: intercuspal position (ICP), incisal clenching (INC), and right unilateral molar clenching (RMOL).
  • Analysis of stress and displacement using Abaqus software.

Main Results:

  • MAO resulted in increased stress and decreased displacement at the mandibular angle across all simulated biting conditions (ICP, INC, RMOL).
  • At the mandibular condylar neck, stress and displacement increased during ICP and RMOL, while remaining unchanged during INC.
  • The biomechanical alterations indicate a shift in load distribution post-MAO.

Conclusions:

  • MAO significantly alters the biomechanical characteristics of the mandible.
  • These alterations suggest a potential increase in the incidence rate of condyle fractures and a decrease in angle fractures after MAO.
  • The findings highlight the importance of considering biomechanical changes in surgical planning and risk assessment for MAO.