A study of hinge axis determination

Abstract

1. An investigation was conducted on 14 subjects to determine if there is a terminal hinge axis and, if so, whether more than one hinge axis point can be located. 2. Neutral observers were used for making the final decision as to whether or not a hinge axis point had been located. 3. No completely edentulous patients were used in the investigation. 4. Premedication was used on 3 of the subjects because of tension. 5. A two man team was used to determine the location of the hinge axis points. 6. Six subjects had a single hinge axis point on both the right and left sides. Five subjects had a single hinge axis point on one side and double hinge axis points on the opposite side. One subject had double hinge axis points on both sides. One subject had three hinge axis points on one side and a single hinge axis point on the opposite side. One subject had two hinge axis points on one side and three hinge axis points on the opposite side. 7. Only 42.8 per cent of the subjects exhibited a single hinge axis point on both the right and left sides.