Fig. 1

a Sagittal CBCT window depicting the alignment of the axial (yellow line) and coronal (blue line) planes for measurements. The crossing point in the median-sagittal plane denotes the location of the first palatal height measurement (M1, R0L0). b Axial CBCT window depicting the aligment of the sagittal plane (red line) for palatal bone height measurements, carried out according to a measurement grid (red dots), constructed starting from the posterior-cranial osseous border of the incisive foramen (M1, R0L0)