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Unilateral TMJ ankylosis

# In unilateral TMJ ankylosis, chin is deviated to:
A. The contralateral side
B. The affected side
C. No deviation seen
D. Side where growth is occurring


The correct answer is B. The affected side.

Unilateral TMJ ankylosis 
Seen in a child or in a person where the onset was usually in the childhood.
1. Obvious facial asymmetry.
2. Deviation of the mandible and chin on the affected side.
3. The chin is receded with hypoplastic mandible on the affected side.
4. Roundness and fullness of the face on the affected side.
5. The appearance of the flatness and elongation on the unaffected side.
6. The lower border of the mandible on the affected side has a concavity that ends in a well defined antegonial notch.
7. In unilateral ankylosis, some amount of oral opening may be possible. Interincisal opening will vary depending on whether it is fibrous or bony ankylosis.
8. Cross bite may be seen.
9. Class II angles malocclusion on the affected side plus unilateral posterior cross bite on the ipsilateral side seen.
10. Condylar movements are absent on the affected side.

Ref: Textbook of Oral and Maxillofacial Surgery, Prof. Dr. Neelima Anil Malik, Third Edition Page 263

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