Cemento-osseous Dysplasia Mimicking Periapical Cyst After the Orthodontic Treatment of the Mandible.

Cemento-osseous dysplasia (COD) is a non-neoplastic condition, characterized by the replacement of normal cancellous bone with fibrous tissues containing woven bone and cementum in the tooth-bearing areas. This report presents the case of a 21-year-old male who developed COD following orthodontic treatment. A panoramic radiograph showed a periapical radiolucent lesion in the right mandibular canine area. Cone beam computed tomography revealed a mixed radiolucent and radiopaque lesion. Histologically, the lesion exhibited cementum-like calcifications and woven bone scattered within the hemorrhagic fibrous tissue. Ultimately, the lesion was diagnosed as cemento-osseous dysplasia, focal type. This case highlights the importance of careful monitoring of orthodontic forces to minimize risks and prevent unexpected complications during orthodontic treatment.