[Results of incorrectly positioned hinge axis on axiographic tracings of mandibular movement]

This article deals with the different influences of an incorrectly located or arbitrary hinge axis upon axiographic tracings of mandibular movements. Unless the recorded curvatures of the three-dimensional pathways of the condyles start from true hinge axis points, paraxial distortions of the tracings will be the result. These recording errors can be so outstanding, that essential advantages of the modern electronical registration systems like the possibility of high-resolution measurement will become uncertain. Within the scope of instrumental analysis of stomatognathic disturbances distorted tracings can lead to false diagnosis easily.