Occlusal contacts: vectorial analysis of forces transmitted to temporomandibular joint and teeth.

Despite relevant command of muscles in the chewing apparatus, occlusion of the upper/lower jaws is constrained by joints and opposing teeth. To describe this system performance, the link quadrilateral bell-crank comprised a suitable model to render vectorial analysis of forces transmitted to the masticatory system during mandibular elevation. Occlusal contacts were created in the above proposed model. No different mechanical responses in the system were found between maximum intercuspation contacts in centric occlusion as compared to long-centric reconstruction. There was a tendency for force decrease in joints and equal force distribution on dentition. Prematurities in centric relation, at least extent, and protrusive interferences produced concentration of forces at dentition and decrease of forces in the joint, while protrusive guidance tended to increase force in the joint.