Coronal CBCT section showing landmarks for the palatal dimension measurements. The palatal interalveolar length (PIL) is the distance between the mid-centres of the cervical portion of the available tooth, from one side to the other. If there was no tooth, then the mid-centre of the alveolar bone near the crest was considered the reference point. Palatal arch depth (PAD) is the length of the line from "P" (junction of the nasal septum and hard palate) to the interalveolar line. The maxillopalatal arch angle (MPAA) is the angle that is formed by the lines from "P" to both points of the mid-centre of the available tooth or the midpoint maxillary alveolar bone for patients missing teeth