Impacted primary second molar with odontoma identified in the adjacent tissue

A case of impacted tooth due to the presence of an odontoma identified in a 5Y7M-old girl is presented. An intraoral examination showed that the maxillary right second primary molar had not emerged into the oral cavity, while a periapical X-ray photograph revealed a small round radiopaque mass with a diameter of approximately 2 mm. The calcified mass was suspected to interfere with eruption of the affected tooth and enucleation of the tissue was carried out under local anesthesia. Histopathological examination results showed that the calcified mass consisted of dental enamel, odontogenic epithelium, and pulp-like tissue, and it was diagnosed as an odontoma. At 6Y1M of age, the tooth had not emerged into the oral cavity due to the possibility of interference in the distal cervical area of the adjacent first primary molar or that of strong tension of the gingiva above the affected tooth. Thus, fenestration of the gingiva over the impacted tooth crown was performed and the tooth crown of the affected tooth appeared in the oral cavity at the age of 6Y6M.