Clinical Presentation Of Temporomandibular Disorder (TMD) Practice Test

What does zig-zag opening pattern indicate?

Mandibular deviation Temporomandibular joint arthritis Bruxism Myofascial pain

Correct Answer:

Mandibular deviation

Explanation:

Zig-zag opening pattern reflects mandibular deviation during opening. When the jaw doesn’t move along a straight midline, it deflects to one side as it opens, producing an irregular, jagged path rather than a smooth arc. This happens because one side (condyle or supporting muscles) is functioning differently from the other, creating an asymmetric glide and a change in direction as the mouth opens. TMJ arthritis tends to bring pain, joint sounds, crepitus, and overall reduced motion rather than a consistent deflection of the opening path. Bruxism mainly causes tooth wear and muscle fatigue without a characteristic directional opening pattern. Myofascial pain can limit opening but doesn’t typically produce a systematic zig-zag deviation of the mandible during opening.

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