This study investigated the siting of the earbow mounting pins on the Dentatus ARL articulator relative to the condylar axis. Further, it showed the repeatability of registrations using the Dentatus AEB face bow and its modification as an earbow. Three face bow and three earbow recordings were made of 35 subjects. Registrations were fitted onto the subject's cast mounted on the articulator to show differences in the recording of the condylar axis. The mean horizontal relationship between the earbow and face bow registrations approximated to the relationship of the earbow mounting pin to the opening axis of the articulator. The mean diameter of the spread of registrations was less for the earbow than the conventional face bow. The use of the earbow modification to the Dentatus face bow is supported.
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