A Case of Odontoma in the Mandible That Induced Impaction of a Primary Second Molar

Abstract

In this report, we describe a case of impaction of the lower left primary second molar of a 6-year-old boy. According to the panoramic radiography and dental cone-beam computed tomography (CBCT) examination, an odontogenic tumor-like structure including enamel component was observed and located near the crown region of the lower left primary second molar impacted with distal inclination. However, this tumor-like structure was independent, not included in the dental sac of the primary second molar. The lower left second premolar was congenitally absent. We diagnosed it as odontoma and removed it. We also performed a biopsy of the surrounding tissue of the odontoma for pathological examination. After removing the odontoma, the impacted primary second molar spontaneously improved its axis. After orthodontic treatment, the primary second molar was aligned in the mandibular arch.

We report the course of treatment of this case for more than 4 years and the consideration of histopathological diagnosis as odontoma.