A case of eruption guidance for eruption disturbances of the bilateral second molars caused by supernumerary teeth

We report a rare case of eruption disturbance of the bilateral second molars caused by supernumerary teeth in a 7-year-old Japanese boy. The supernumerary teeth were detected by radiographic examination. Computed tomography (CT) was used to examine the positional relationship of the supernumerary teeth and neighboring second molars. CT images showed conical-shaped supernumerary teeth on the upper buccal side of the unerupted mandibular second molars. The cusps of the supernumerary teeth pointed toward the lingual side. Because the two supernumerary teeth threatened to disturb the eruption of the second molars, they were surgically removed at 2 years and 4 months after diagnosis. After removal of the supernumerary teeth, the mandibular second molars erupted at a normal age and aligned normally within the dentition. To the best of our knowledge, this is only one case report of eruption guidance for eruption disturbances of the bilateral second molars caused by supernumerary teeth.