Bilateral Distomolars in the Maxilla : Computed Radiographic and Cone-beam CT Findings

抄録

Distomolar (also known as the fourth molar) is an abnormality in the number of teeth. This finding is usually present on one side of the maxilla, and is comparatively rare as a bilateral finding. We encountered a case of bilateral maxillary distomolars on pantomography. The image reading reports of pantomography and cone-beam CT were created using the reporting system of our radiology department. As we observed panoramic computed radiography, we identified bilateral impacted third molars in the maxilla, with distomolars adjacent to each. Supernumerary teeth displayed normal tooth morphology with regard to crowns and roots but were slightly smaller than the third molars. On cone-beam CT, distomolars were found behind the third molar on both right and left sides of the maxilla. Distomolars were completely impacted, and parts of the roots were near the maxillary sinus on 3D cone-beam CT images.