Analysis of internal and external forces of a human mandible invested by strength of materials: analysis of a mandibular model with anterior zone oblique to frontal plane.

Abstract

In a human mandibular model with anterior zone oblique to frontal plane, internal and external forces were analyzed by strength of materials. Bending moment and torsion moment were rorated at the bilateral canine regions. In the anterior zone, shearing force was unchanged, but bending moment and torsion moment were changed at the symphysis. There existed a hyperbola function relationship between bearing ratio of balancing side to working side in masticatory muscle force and corresponding loading ratio in TMJ reaction force. The method in this study is suggested to be clinically useful for analysis of internal and external forces of a human mandible.