Background: In dentistry, the height at which the mandibular and maxillary teeth occlude is referred to as the "occlusal vertical dimension." To address the restorative requirements of prosthodontic patients, increases in the occlusal vertical dimension are frequently required. However, it is usually difficult to tell whether the occlusal vertical dimension has been lost. Therefore, the first concern must be whether any alteration of the occlusal vertical dimension is restoratively acceptable