Figure 1

(A, D-F) axial CT images and (B-C) coronal CT image showing the way of the measurement of different dimensions: (1) maximal width of the maxillary sinus, (2) the width at the middle of the maxillary sinus, (3) maximal depth (anteroposterior diameter) of the maxillary sinus, (4) maximal height of the maxillary sinus, (5) thickness of the orbital floor, (6) the thickness of soft tissue between the anterior wall of maxillary sinus at the canine fossa and the skin surface, (7) the thickness of anterior wall of the maxillary sinus (canine fossa), and (8) the automatically measured volume. (9) The depth of the frontal sinus, and (10) the thickness of the anterior wall of the frontal sinus were measured at the level of the orbital roof, 1 cm lateral to the midline. All measurements were made on images with skeletal settings.