Fig. 7

a In order to confirm the panoramic features of the nasal floor, the gauze soaked in contrast media is placed on the nasal floor of the plastic skull and a panoramic radiograph is obtained. The three-dimensional nasal floor not only forms a radiopaque line below the demarcated nasal cavity (blue arrow) but it also extends posteriorly as a radiopaque line, often known as the hard palate line, which is anatomically the palatal process of the maxilla (red arrow). b The actual nasal cavity is present in the panoramic image, with a long posterior overlap along the nasal floor line