Abstract: Objective: The present research provides prediction for the possible changes of the location of the mandibular foramen in patients of TMJ ankylosis. Subjects and methods: Forty four subjects were included in this study; they were divided into two groups. Group I included 14 patients with TMJ bony ankylosis; they were selected from those attending the out patients clinics of Oral and Maxillofacial Department, Faculty of Oral and Dental medicine, Cairo University, Egypt. Group II included 30 normal subjects having same age range as group I. Certain measurements were selected on the medial side of mandible to locate the position of mandibular foramen in ankylosis group in comparison to normal subjects. Results: The lower half of mandibular ramus in ankylosis group was statistically significant shorter than normal group. The length of coronoid process in cases of long duration was significantly longer when compared with normal subjects and the cases below 10 year duration. Conclusions: The mandibular foramen exists in the lower half of mandibular ramus in position closer to the most inferior point of ankylosing bony mass. Also there is elongation of the distance between mandibular foramen and most superior point of the coronoid process.Abstract: Objective: The present research provides prediction for the possible changes of the location of the mandibular foramen in patients of TMJ ankylosis. Subjects and methods: Forty four subjects were included in this study; they were divided into two groups. Group I included 14 patients with TMJ bony ankylosis; they were selected from those attending t...Show More