Virtual Surgical Planning in Condyle Reconstruction of Posterior Mandibulectomy Defects.

Abstract

Background: Ameloblastoma is a rare odontogenic tumor most commonly located within the mandible. These tumors can grow to massive proportions and result in malocclusion. Segmental mandibulectomy and reconstruction with an osteocutaneous free flap are frequently required. Virtual surgical planning (VSP) aids the surgeon in creating precise anatomic reconstruction when there is preoperative malocclusion due to tumor size. In this study we seek to further examine reconstruction of posterior mandibulectomy defects inclusive of condylar resection.

Methods: Retrospective review of patients treated for giant ameloblastoma (tumor >4 cm) was examined; 3 patients with posterior tumors requiring ramus and condylar resection were included. Reconstruction in all patients was performed using fibula free flaps and VSP custom-made mandibular reconstruction plates. In these patients the reconstructed ramus was shortened and precise contouring done with a burr to recreate the native condylar surface. Intermaxillary fixation was used to maintain occlusion for 1 month postoperatively. Inferior alveolar nerve repair with allograft and nerve connectors was performed for all 3 patients.

Results: All patients underwent successful mandibular reconstruction with preservation of mandibular function and improved occlusion postoperatively. Inferior alveolar nerve repair using nerve allograft allowed for neurosensory recovery in the mandibular division of trigeminal nerve distribution in 2 of the 3 patients.

Conclusions: Giant ameloblastoma involving the mandibular condyle can be successfully treated with the fibula free flap utilizing mandible reconstruction plates and VSP. This technique allows for excellent restoration of occlusion and neurosensory recovery when paired with reconstruction of the inferior alveolar nerve at time of reconstruction.