Background: Mandibular reconstruction is performed after segmental mandibulectomy, and precise repositioning\nof the condylar head in the temporomandibular fossa is essential for maintaining preoperative occlusion.\nMethods: In cases without involvement of soft tissue around the mandibular bone, the autopolymer resin in a soft\nstate is pressed against the lower border of the mandible and buccal and lingual sides of the 3D model on the excised\nside. After hardening, it is shaved with a carbide bar to make the proximal and distal parts parallel to the resected\nsurface in order to determine the direction of mandibular resection. On the other hand, in cases that require resection\nof soft tissue around the mandible such as cases of a malignant tumor, right and left mandibular rami of the 3D model\nare connected with the autopolymer resin to keep the preoperative position between proximal and distal segments\nbefore surgical simulation. The device is made to fit the lower border of the anterior mandible and the posterior border\nof the mandibular ramus. The device has a U-shaped handle so that adaptation of the device will not interfere with the\nsoft tissue to be removed and has holes to be fixed on the mandible with screws.\nResults: We successfully performed the planned accurate segmental mandibulectomy and the precise repositioning of\nthe condylar head by the device.\nConclusions: The present technique and device that we developed proved to be simple and useful for restoring the\npreoperative condylar head positioning in the temporomandibular fossa and the precise resection of the mandible
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