Concrescent teeth are a rare anomaly of the teeth defined as the cemental union of two or more adjacent teeth. With a frequency of 0.8% among all anomalous teeth, dentigerous cysts associated with concreted teeth are considered even rarer. In this report, we present a case of a concrescent tooth arising from a fused maxillary wisdom tooth and a supernumerary tooth, with dentigerous cysts. An 18‐year‐old man was referred to our department complaining of the extraction of his left lower wisdom teeth without symptoms. The panoramic X‐ray image incidentally showed radiopaque lesions resembling an odontoma and radiolucent lesions with a cyst in the area of the right upper wisdom tooth. Eventually, under general anesthesia, he underwent extraction of four wisdom teeth and cyst removal. In the right upper wisdom tooth, two occlusal surfaces were observed, and cysts were identified in each one of them. Hard tissue‐like enamel was observed around the center of the connected teeth. Microscopically, the two teeth were observed to be fused with cementum and connected in a completely hierarchical position. The histopathological diagnosis was of concrescent teeth in the right upper wisdom tooth, supernumerary tooth, and dentigerous cysts. Almost 3 months after surgery, the patient’s condition remained stable. To date, no reports of the maxillary concretions associated with a supernumerary tooth and a dentigerous cyst have been published, highlighting the rarity of this case. In conclusion, our case highlights that even if an odontoma appears, a concrescent tooth may occur in fused wisdom and supernumerary teeth with dentigerous cysts.
Shibata et al. (Thu,) studied this question.