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is likely to occur when bruxism is present.It seems to be the result on the shorter condyle side at unilateral bruxism as most often the shorter condyle side is being used as the mediotrusive side. The bird beak formation of the antero-lateral part of the condyle in combination with the flattened surfaces of the articular joint components is easy to recognize in any panoramic X-ray.

Dental treatment in patients with the radiological signs of a developing TMJ arthrosis should therefore routinely not be executed in the “normal” intercuspal position. The dental treatment must be guided by the normally developed, higher and healthy condyle. This approach often entitles a more extended treatment. The vertical dimension of the occlusion of the shorter condyle side needs to be increased as the treatment  is aiming at a symmetrical temporomandibular joint function. The treatment thereby is compensating at the occlusal level  what is missing vertically intraarticularly.avoiding or reducing the effects unilateral bruxism.