Relationship between structure and the stress pattern in the human mandible

Area of Science:

• Biomechanical Engineering
• Dental Anatomy
• Human Osteology

Background:

• Understanding the biomechanics of the human mandible is essential for prosthodontics and oral surgery.
• Previous research has explored mandibular morphology, but detailed stress distribution analysis linked to internal structure is less understood.

Purpose of the Study:

• To investigate the relationship between the internal bony structure of human mandibles and the resulting stress distribution patterns.
• To analyze how condylar shape and internal anatomy correlate with isostatic flow lines under simulated occlusal loads.

Main Methods:

• Lateral radiograms and digital electronic measurements were used to analyze the internal bony structure and condylar shape of ten human mandibles.
• Photoelastic coating was applied to the external surface, followed by simulation of centric occlusion and occlusal loads.
• Isoclinics were recorded using plane-polarized light, and isostatic flow lines were constructed to visualize stress distribution.

Main Results:

• A direct correlation was identified between the specific internal mandibular bone structure and the pattern of isostatic flow lines.
• The distribution of stress lines varied based on the examined mandibular anatomy and condylar morphology.

Conclusions:

• The internal anatomical features of the human mandible play a significant role in determining how occlusal forces are distributed.
• These findings provide a basis for understanding functional adaptations and potential failure points in mandibular bone under stress.