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Orthodontics · single question

Which of the following does NOT cause malocclusion?

  1. Ankylosis
  2. Internal resorption
  3. External root resorption
  4. Premature loss of primary teeth
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Correct answer: B. Internal resorption

Internal resorption occurs WITHIN the root canal and does not affect tooth position or occlusal relationships — it does NOT cause malocclusion. External resorption, ankylosis (infraocclusion), and premature primary tooth loss (space loss/drift) all can affect occlusion.
  • A. Ankylosis prevents eruption, causes infraocclusion/submergence — DOES cause malocclusion.
  • B. CORRECT. Internal resorption does NOT cause malocclusion — occurs within the tooth structure, doesn't affect position.
  • C. External root resorption shortens roots, increases mobility — CAN cause malocclusion.
  • D. Premature primary tooth loss → space loss/drift → ectopic permanent eruption — DOES cause malocclusion.

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