Identifying the terminal hinge axis (THA) requires dedicated equipment, such as a kinematic facebow, operated by highly trained practitioners. Instead, most clinicians employ anatomic facebows, which use average hinge axis values, sometimes leading to severe errors. The frequently used arbitrary articulation of the analog or virtual models might increase the potential bias dramatically. Therefore, we joined Dr. Előd Úry and GAMMA in an experimental study to demonstrate the clinical consequences of using the wrong THA while performing dental rehabilitation requiring a change in vertical dimensions.