Fig. 3.

a, b Determination of palatal height: A point on the median raphe was connected perpendicularly to the most coronal point of the gingival margin on a the 1st premolars or deciduous molars and b the first permanent molars. For the height at the median raphe, the mean value was calculated of measurements at the reference teeth in both quadrants. a For the first deciduous molars or first premolars, the same measurement was taken 5 mm to the right (to the 1st quadrant) and to the left (to the 2nd quadrant) of the palatal centre, and b on the first permanent molars, 5 mm and 10 mm to the right and to the left of the palatal centre