[Considerations of precision and consistance of mandibular transverse hinge axis].

This paper deals with the nature of mandibular hinge axis and the consequences for its application in diagnostics and treatment. The transversal hinge axis of the mandible can be characterized as an exact and true axis of pure mandibular rotation or a more or less exactly located axis as a result of a combined rotation and translation of the condyles. During opening movements of about 8 mm already an insignificant gliding of the condyles of 0.5 mm displaces the individual located hinge axis of more than 6 mm in its relation to the lower jaw. The true hinge axis as it is needed for achsiographic or pantographic registration techniques has inevitably not to be identical with the transferred axis for mounting casts in an adjustable articulator.