On a standard periapical radiograph, where is the maxillary sinus typically located relative to the posterior maxillary teeth?

On a standard periapical radiograph, where is the maxillary sinus typically located relative to the posterior maxillary teeth?

• A. Superior to the roots of the maxillary posterior teeth.
• B. Inferior to the roots of the maxillary posterior teeth.
• C. Buccal to the roots of the maxillary posterior teeth.
• D. Lingual to the roots of the maxillary posterior teeth.

Answer: (A)

The maxillary sinus sits above the roots of the posterior maxillary teeth. On a standard periapical radiograph, you’ll see the sinus as a radiolucent cavity with a thin radiopaque border above the tooth roots, and the floor of the sinus forms part of the alveolar roof. This superior relationship means the roots can be close to or even project into the sinus floor, especially with molars. The other directions (below, toward the cheek, or toward the tongue) don’t describe the typical anatomical arrangement seen on these images.

The maxillary sinus sits above the roots of the posterior maxillary teeth. On a standard periapical radiograph, you’ll see the sinus as a radiolucent cavity with a thin radiopaque border above the tooth roots, and the floor of the sinus forms part of the alveolar roof. This superior relationship means the roots can be close to or even project into the sinus floor, especially with molars. The other directions (below, toward the cheek, or toward the tongue) don’t describe the typical anatomical arrangement seen on these images.