Which statement about the disc without reduction is most accurate regarding mouth opening?

Which statement about the disc without reduction is most accurate regarding mouth opening?

• A. It reduces during opening
• B. It does not reduce
• C. It only reduces when painful
• D. It has no effect on opening

Answer: (B)

Disc displacement without reduction means the articular disc stays anterior to the condyle and does not return to its normal position during jaw movement. That non-reducing behavior is the defining feature of this condition, and it explains why mouth opening is typically limited—the condyle can’t translate freely past the displaced disc. So saying that the disc does not reduce best captures how this condition behaves. The other statements would imply the disc repositions during opening or have no effect, which doesn’t fit disc displacement without reduction.

Disc displacement without reduction means the articular disc stays anterior to the condyle and does not return to its normal position during jaw movement. That non-reducing behavior is the defining feature of this condition, and it explains why mouth opening is typically limited—the condyle can’t translate freely past the displaced disc. So saying that the disc does not reduce best captures how this condition behaves. The other statements would imply the disc repositions during opening or have no effect, which doesn’t fit disc displacement without reduction.