1. A vertical measurement of the face between two points located one above the oral cavity and one below it.
2. The vertical height of the face recorded with the teeth in occlusion. The vertical dimension may be reduced by attrition of the natural or artificial teeth, the total loss of the natural dentition, or the resorption of the alveolar bone. The vertical dimension may be increased by modification of the natural or artificial teeth. The vertical rest dimension is the vertical dimension with the lower jaw in the rest position with minimum muscular activity; it is a measurement used in prosthetic treatment when assessing the correct aesthetic proportion of the face; it can be measured using a Willis bite gauge.