Modelling the masticatory biomechanics of a pig

Area of Science:

• Biomechanics
• Craniofacial Morphology
• Computational Modeling

Background:

• The intricate relationships between muscle tension, jaw movement, bite forces, and craniofacial structure remain incompletely understood.
• Three-dimensional (3-D) computer models offer a powerful approach to integrate anatomical and functional data for analyzing these complex interactions.

Purpose of the Study:

• To construct and validate a 3-D dynamic computational model of a pig's masticatory system.
• To investigate the feasibility of simulating functional jaw movements and forces using individual-specific anatomical and functional data.

Main Methods:

• Utilized CT scanning for skeletal elements and MR imaging for muscle anatomy.
• Acquired functional data via intramuscular electrodes in six masticatory muscles during chewing, combined with existing EMG data.
• Developed a 3-D dynamic model driven by functional data to predict jaw motions and forces.

Main Results:

• Successfully reconstructed the 3-D anatomy of the individual pig's masticatory system.
• The model generated realistic jaw motions, including side-alternating chewing patterns typical for pigs.
• Simulated jaw excursions, phase timing, condylar motions, and forces aligned with previously published data and expected ranges.

Conclusions:

• It is feasible to create accurate 3-D dynamic models of individual masticatory systems.
• Combining biomechanical principles with individual-specific anatomical and functional data enables accurate simulation of chewing cycles.
• This modeling approach provides valuable insights into masticatory system biomechanics.