Fig. 3

Reconstruction of 3D palatal morphology. 1, The plane cutting of the lowermost horizontal plane of the maxilla; 2, the plane cutting of the backmost coronal plane of the maxilla; 3, the palate was selected to create a bounded component; 4, the palate was remained and the residual sections were removed; 5 and 6, the 3D closed figure of the palate was obtained by filling the boundary hole