Which procedure best describes the purpose of a facebow during mounting?

• A. Orienting the maxillary arch relative to the skull during mounting
• B. Measuring vertical dimension of occlusion
• C. Recording the color of teeth
• D. Holding the cast in place

Answer: (A)

The facebow’s job is to transfer the spatial position of the maxilla relative to the skull so the upper jaw can be mounted on an articulator in the same orientation it has in the patient. By linking the maxilla to a skull reference (often the hinge axis or a standard horizontal plane), the technician can reproduce the patient’s jaw position on the articulator, which is essential for accurate occlusion and condylar guidance during treatment planning.

Vertical dimension of occlusion is set with bite registrations or wax rims, not by the facebow, so measuring that is not its purpose. Recording tooth color and simply holding the cast in place are also not functions of the facebow.