Scissor bite correction and molar-extraction space closure adjacent to a large radicular cyst bone defect

Radicular cysts are commonly encountered inflammatory cysts that can lead to significant bone defect if left untreated. When performing orthodontic treatment on patients with large radicular cyst, special attention must be given to the movement of teeth adjacent to the bone defect. This case report describes the treatment of a patient with a large radicular cyst located in the mandibular body originating from a decayed molar. The condition was further complicated by the supernumerary teeth within the maxillary dentition, multiple decayed teeth, scissors bite, severe crowding, deep bite, shortening of the left ramal height and canted mandibular occlusal plane. The radicular cyst was successfully treated through marsupialization, and the supernumerary teeth were extracted. Correction of the scissors bite was achieved using a combination of a bite plate and a transpalatal arch with extending hooks. The decayed molar was extracted, and the resulting space was closed, ultimately achieving good occlusion without the need for prosthesis placement. This case report emphasizes the significance of close monitoring of large radicular cysts using cone-beam computed tomography, and the importance of careful planning when arranging the sequence of the tooth movement adjacent to the cystic lesions during orthodontic treatment.