i. Face Bow (FACE BOW, ARTICULATOR DENTAL). The face bow (figure
5-8) is an instrument used to register and record the positional relationship of a patient's
maxillae to his temporomandibular joints and to mount a cast of his maxillary arch in the
same relationship to the hinge axis of an articulator. The face bow is fitted with a bite
fork that is used to attach the face bow to the upper occlusion rim.
Figure 5-8. Face bow with bite fork.
j. Needle Point Tracer (GRACER, GOTHIC ARCH, DENTAL). The needle
point-tracer (figure 5-9) is a mechanical device used to indicate or record the direction
and extent of movements of the mandible. It is also used to indicate the relative
horizontal position of the mandible to the maxilla.
Figure 5-9. Needle point-tracer.