What is the primary benefit of using a facebow transfer in prosthodontic treatment?

The primary benefit of a facebow is to transfer the three-dimensional position of the maxillary arch relative to the transverse hinge axis (condylar axis) to the articulator. This allows the laboratory technician to simulate mandibular movements on the articulator that approximate those of the patient. The facebow also records the orientation of the maxillary occlusal plane to the axis-orbital plane. Without a facebow, the maxillary cast is mounted using average values, which introduces error. The facebow does NOT record midline, centric relation, or vertical dimension.