A falsely detected normal case. In a normal subject (without CA), a red bounding box is shown on the right incisor region. The inferior piriform aperture lines on the both sides are obscure and superimposed by the radiopaque lines caused by the hard palate. The right lateral incisor is missing (probably congenitally), and the canine shows medial inclination, so the space between these teeth is relatively wide. The model probably mistakenly recognizes the canine as the lateral incisor.