By Dr. Vishaal Bhat on Friday, 11 April, 2008 with 0 comments

Immobility or fusion of the joint.

Ankylosis of the TMJ most often results from trauma or infection, although it may accompany RA or be congenital. Chronic, painless limitation of movement occurs. When ankylosis leads to arrest of condylar growth, facial asymmetry is usual . Intra-articular (true) ankylosis must be distinguished from extra-articular (false) ankylosis, which may be caused by enlargement of the coronoid process, depressed fracture of the zygomatic arch, or scarring from surgery, irradiation, or infection. In most cases of true ankylosis, x-rays of the TMJ show loss of normal bony architecture.


Treatment may include a condylectomy if the ankylosis is intra-articular or an ostectomy of part of the ramus if the coronoid process and zygomatic arch are also affected. Jaw-opening exercises must be performed for months to years to maintain the surgical correction, but forced opening of the jaws without surgery is generally ineffective because of bony fusion.

Category: Oral Medicine Notes



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