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Orthodontics · single question

A crossbite represents which category of malocclusion?

  1. A transverse (width) discrepancy of the arches (anterior or posterior)
  2. A sagittal (anteroposterior) Class II discrepancy
  3. A vertical open-bite discrepancy
  4. A Class III sagittal discrepancy only
Show answer and explanation

Correct answer: A. A transverse (width) discrepancy of the arches (anterior or posterior)

Crossbite is a transverse problem: the buccolingual relationship of opposing teeth is reversed, classified as anterior or posterior crossbite in the width (transverse) plane.Other options: Class II/III relationships are sagittal; open/deep bite are vertical. Crossbite is fundamentally transverse.Key exam takeaway: Crossbite = transverse (width) malocclusion; sagittal = Class I/II/III; vertical = open/deep bite.

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