Arbitrary mandibular hinge axis locations.

This study compared selected arbitrary hinge axis locations with the kinematic axis location. Fifty subjects were studied, and the data were statistically analyzed. Results showed significant differences between the location of experimental arbitrary axis point and those of Beyron, Gysi, and Bergstrom in relation to the kinematic axis. The arbitrary points of Beyron, Gysi, and Bergstrom showed directional tendencies, whereas the experimental arbitrary points were evenly distributed around the kinematic axis. This study indicates that the experimental arbitrary axis point more closely and consistently approximated the kinematic axis than the arbitrary points of Beyron, Gysi, and Bergstrom. The finding suggests that the clinical use of a point on Camper's line, 10 mm from the superior border of the tragus, results in a more accurate transfer of the maxillary cast to the articulator.