Fig. 2

Mirroring process of the palate and superimposition between original (reference) and mirrored model. A, B The median palatal plane (MPP) was drawn through two landmarks detected along the median palatal raphe and showed in red. The first landmark identified the point on the median palatal raphe adjacent to the second ruga (Point 1). The second landmark was placed on the median palatal raphe 1 cm distal to the first point (Point 2). C Generation of duplicated mirrored model of the palate (blue model = original, green model = mirrored). D Superimposition of the original and mirrored models using the MPP plane and its perpendicular plane as reference and final superimposition adjustment using ‘best-fit’ alignment algorithm