RESUMEN
Fusion of the zygomatic bone to the coronoid process of the mandible is a rare phenomenon reported in the literature and commonly called as zygomaticocoronoid ankylosis. It can be sequel of trauma or infection in the midfacial region, mimicking a wide range of problems including the common temporomandibular joint ankylosis and dysfunction. Maxillofacial trauma involving the displaced fracture of zygoma can obstruct the movement of coronoid and if not treated can cause ankylosis between both bones. It is very diffi cult to identify zygomaticocoronoid ankylosis on conventional radiographs and requires the through clinical and advanced radiological evaluation like cone-beam computed tomographic (CBCT) to diagnose it. CBCT can be a great help to identify the size and extension of ankylotic mass and decide the approach to remove it. Zygomaticocoronoid ankylosis can be approached intraorally by Keen’s incision, and extraorally through a hemicoronal approach we have approached intraorally. Here, we present surgical management of post-traumatic zygomaticocoronoid ankylosis in 42-year-old male patient who had trismus for 18 years.