Vertical dimension record: a three dimensional phenomenon. Part II

Face height and profile have two displacement dimensions that can be measured: the superior-inferior face height measurement, and the anterior-posterior displacement of the midsagittal profile measurement. The superior-inferior displacement is largely a function of movement of the lower lip and related mandibular structures. The anterior-posterior displacement is generally associated with movement of the upper lip, particularly the tubercle. The changes in one dimension are usually a function of change in the other dimension; that is, an increase in height may be associated with contraction of the dental arches; or conversely, reduction of vertical height may be associated with expansion of the dental arches.