Fig. 1From: Cone-beam computed tomography-based analysis of maxillary sinus pneumatization extended into the alveolar process in different age groupsMultiplanar reconstruction of the head and maxilla. A Sagittal plane: the connecting line (yellow dashed line) of the anterior nasal spine (yellow arrow) and posterior nasal spine (red arrow) was parallel to the horizontal plane; B Coronal plane: the nasal cavity floor (yellow dashed line) was parallel to the horizontal planeBack to article page