Tooth development and dental anatomy: regional odontodysplasia: practice question

A Dentistry question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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Dentistry · Tooth development and dental anatomy: regional odontodysplasia

Sample item

A child has delayed eruption of several maxillary teeth in one quadrant. Radiographs show thin enamel and dentine with large pulp chambers, giving the teeth a faint outline. What is the diagnosis?

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

A. Regional odontodysplasia

Regional odontodysplasia produces ghost teeth confined to one area, with poorly mineralised enamel and dentine. It is non-hereditary and most often affects the maxilla.

Option by option

  • A. Regional odontodysplasia (correct)

    Correct. Localised ghost-like teeth define this condition.

  • B. Dentinogenesis imperfecta

    Dentinogenesis imperfecta affects all teeth and obliterates the pulp chamber.

  • C. Amelogenesis imperfecta

    Amelogenesis imperfecta affects all teeth and only enamel.

  • D. Cleidocranial dysplasia

    Cleidocranial dysplasia shows clavicle anomalies and many unerupted supernumerary teeth.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

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Questions about this Dentistry question

What is the answer to this Dentistry question?

The best answer is A, Regional odontodysplasia. Regional odontodysplasia produces ghost teeth confined to one area, with poorly mineralised enamel and dentine.

Why is "Dentinogenesis imperfecta" not the answer?

Dentinogenesis imperfecta affects all teeth and obliterates the pulp chamber.

Why is "Amelogenesis imperfecta" not the answer?

Amelogenesis imperfecta affects all teeth and only enamel.

Why is "Cleidocranial dysplasia" not the answer?

Cleidocranial dysplasia shows clavicle anomalies and many unerupted supernumerary teeth.

What concept does this question test?

It tests Tooth development and dental anatomy: regional odontodysplasia in Dentistry. It is non-hereditary and most often affects the maxilla.

How hard is this question?

We tag it as a multi-step question: it asks you to combine more than one idea. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Tooth development and dental anatomy: regional odontodysplasia?

Learn the dental formula, eruption ages and tooth structure once, as tables. Then use the flashcards and the other Dentistry questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.