What is mandibular deviation?

What is mandibular deviation?

• A. Zig-zag movement during opening
• B. Pure forward movement
• C. Side-to-side excursion at rest
• D. Circular motion

Answer: (A)

Mandibular deviation is an abnormal deflection of the jaw from its midline during movement, most often seen as the jaw shifting off center as it opens. That shifting path can be irregular, giving a zig-zag pattern rather than a straight glide. This reflects uneven motion between the two temporomandibular joints or imbalanced muscle activity, which causes the mandible to deflect rather than move smoothly straight down. A plain forward (protrusive) movement would be a smooth, direct path rather than a deflected one. Side-to-side excursion at rest describes movement when not actively guiding the bite, which isn’t the typical description of deviation during opening. Circular motion isn’t how the mandible normally moves during opening or deviation, so it doesn’t capture the concept.

Mandibular deviation is an abnormal deflection of the jaw from its midline during movement, most often seen as the jaw shifting off center as it opens. That shifting path can be irregular, giving a zig-zag pattern rather than a straight glide. This reflects uneven motion between the two temporomandibular joints or imbalanced muscle activity, which causes the mandible to deflect rather than move smoothly straight down.

A plain forward (protrusive) movement would be a smooth, direct path rather than a deflected one. Side-to-side excursion at rest describes movement when not actively guiding the bite, which isn’t the typical description of deviation during opening. Circular motion isn’t how the mandible normally moves during opening or deviation, so it doesn’t capture the concept.