Stress shielding FE analysis on the temporomandibular joint

Area of Science:

• Biomechanical Engineering
• Craniofacial Anatomy
• Musculoskeletal System Modeling

Background:

• The temporomandibular joint (TMJ) is complex, influenced by multiple muscles.
• Understanding TMJ biomechanics is crucial for diagnosing and treating related disorders.

Purpose of the Study:

• To create a 3D finite element (FE) model of the mandible.
• To investigate the forces exerted by key masticatory muscles on the TMJ.
• To analyze stress distribution within TMJ components.

Main Methods:

• A 3D FE model of the mandible was constructed using cone-beam computed tomography (CBCT) data.
• The loading force system was defined by studying the forces of the lateral pterygoid, masseter, medial pterygoid, temporalis, and geniohyoid digastric muscles.
• Stress analysis was performed on the TMJ disc, mandibular condyle, and fossa eminence.

Main Results:

• The study successfully generated stress distributions within the TMJ components.
• Results demonstrated the pattern of stress during normal occlusion.
• The FE model provides insights into the mechanical behavior of the TMJ under muscular loading.

Conclusions:

• FE modeling of the TMJ offers a valuable tool for understanding its mechanical behavior.
• Appreciating anatomical and mechanical features aids in diagnosing TMJ conditions.
• Clinical examination and patient history are essential for a comprehensive diagnostic process.