The temporomandibular joints (TMJ) or the craniomandibular articulations are synovial joints formed by the convex condyles of the mandible, he concave glenoid fossa (mandibular fossa), and the convex articular eminence of the temporal bone. The TMJs are among the most frequently used joint in the body. In their functions of chewing, talking, yawning, swallowing, and sneezing, the TMJs are estimated to move 1,500 to 2,000 times per day. These joints provide motions of opening, closing, protrusion, retraction, and lateral deviation of the mandible on the temporal bone. (Brunnstorm 2012)
Studies have proven that mandibular length causes variations in TMJ function. And as of this moment, there has been no universally accepted innovated TMJ measuring device that accomodates mandibular length and measures angular movement of the joint. In addition, it is necessary to acquire the values of different TMJ motions in relation with each other in order to fully assess its function. To be able to do this, efficiency, most especially with respect to time, is another concern in assessment.