axis

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In this position, mandible purely rotates in the sagittal plane around the Terminal Hinge Axis (THA) passing through the two (medial and lateral) poles of both condyles and mouth is opened up to 20-25 mm for normal talking and respiration without translation in the upper compartment of temporomandibular joint.
3,6 Use of arbitrary hinge axis is considered sufficiently accurate to create a functional occlusion and prevent occlusal errors particularly when cusped teeth are used in removable complete dentures (RCD).
The facebow is then attached to the semi adjustable articulator to transfer the recorded relationship of the maxilla by ensuring that the corresponding cast is attached in the proper position relative to the hinge axis of the instrument.