Abstract
The temporomandibular joint makes it possible to open and close your mouth, as involving chewing, swallowing, speaking, and yawning activity. Ankylosis of the Temporomandibular joint which includes partial or complete fusion of the joint with resulting restricted opening of mouth, restricted mandibular movements (hypomobility) with deviation to the affected side on opening of the mouth. The pathology is multifactorial and restoration of function usually involves surgical intervention and dependence on the exact pathology situated at the root of pons. It is essential to evaluate the underlying pathology, its degree for proper planning of surgery and follow-up. 3-D CT scan of facial bones provide a reliable and consistent diagnosis and evaluation for temporomandibular joint ankylosis. 
 Keywords: TMJ, ankylosis, 3-D CT scan, facial asymmetry.
Highlights
A 24 year old female presented with sudden onset complete inability to open mouth
Findings are suggestive of Sawhney type I/ fibrous ankylosis of the right temporomandibular joint
Aims and Objectives of surgery are to create a mobile joint by resection of ankylosed mass and creation of a gap, to reconstruct the joint and restore the vertical height of the ramus, and restore normal facial growth pattern
Summary
A 24 year old female presented with sudden onset complete inability to open mouth. She was having restricted jaw movement since childhood and had difficulty chewing larger bites of food. There was no history of tobacco abuse. The differential diagnosis for restricted mouth includes – temporomandibular ankylosis, TMJ dislocation, submucosal fibrosis, mandibular fracture, and facial palsy.
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