In unilateral TMJ ankylosis, the chin is deviated to:

 # In unilateral TMJ ankylosis, the 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.

In unilateral ankylosis occurring at an early age, the chin is displaced laterally and backward on the affected side because of a failure of development of the mandible. When an attempt is made to open the mouth, the chin deviates toward, the ankylosed side, if any motion is present. Bilateral ankylosis occurring in childhood results in underdevelopment of the lower face; a receding chin and micrognathia. The maxillary incisors often manifest overjet due to failure of this mandibular growth.

Ref: Shafer's Textbook of Oral Pathology, 7th Edition, Page No. 742

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