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Prosthodontics & Occlusion · single question

The mandible deviates to the RIGHT and is painful. What is happening to the disc?

  1. Left disc displaced anteriorly with reduction
  2. Left disc displaced anteriorly without reduction
  3. Right articular disc displaced anteriorly WITHOUT reduction
  4. Right disc displaced anteriorly WITH reduction
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Correct answer: C. Right articular disc displaced anteriorly WITHOUT reduction

  • A. Incorrect – wrong side and 'with reduction' usually shows deviation that corrects (deflection then return).
  • B. Incorrect – a left closed lock would deviate the mandible to the LEFT.
  • C. Correct – in anterior disc displacement WITHOUT reduction (closed lock), the condyle on the affected side cannot translate, so on opening the mandible DEVIATES TOWARD the affected (right) side.
  • D. Incorrect – with reduction the disc reduces (often with a click) and the path corrects, rather than a sustained deviation/limited opening.

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