Ossifying fibroma （OF） is a benign fibro-osseous tumor comprising bone-like hard tissue. Maxillofacial OF can cause facial asymmetry. However, reduction surgery by the intraoral approach is very challenging and can provide insufficient results. We report here a case in which navigation surgery for maxillary OF provided good facial symmetry by bone reduction based on the preoperative plan. A 15-year-old male with OF the maxilla underwent navigation surgery after preoperative planning including the mirroring method. The patient gained good facial symmetry after surgery, and there was no recurrence for 2 years and 6 months after surgery.
