Tooth development and dental anatomy: dentine dysplasia type II: 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: dentine dysplasia type II

Sample item

A child has amber-coloured, opalescent primary teeth. The permanent teeth are normal in colour, but radiographs show thistle-tube shaped pulp chambers containing pulp stones, with roots of normal length. What is the diagnosis?

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

The answer and the reasoning

A. Dentine dysplasia type II

Coronal dentine dysplasia (type II) shows opalescent primary teeth resembling dentinogenesis imperfecta, while the permanent teeth look clinically normal and show a thistle-tube pulp with stones. It is linked to DSPP. Type I has short roots and obliterated pulps.

Option by option

  • A. Dentine dysplasia type II (correct)

    Correct. Opalescent primary teeth with normal-looking permanent teeth and a thistle-tube pulp fit type II.

  • B. Dentinogenesis imperfecta type II

    Here the permanent teeth are also opalescent and bulbous, with obliterated pulp chambers.

  • C. Regional odontodysplasia

    This affects localised teeth in one quadrant that look thin and ghost-like, not a generalised dentine pattern.

  • D. Dentine dysplasia type I

    Type I has rootless-appearing teeth with very short roots and obliterated chambers in both dentitions.

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, Dentine dysplasia type II. Coronal dentine dysplasia (type II) shows opalescent primary teeth resembling dentinogenesis imperfecta, while the permanent teeth look clinically normal and show a thistle-tube pulp with stones.

Why is "Dentinogenesis imperfecta type II" not the answer?

Here the permanent teeth are also opalescent and bulbous, with obliterated pulp chambers.

Why is "Regional odontodysplasia" not the answer?

This affects localised teeth in one quadrant that look thin and ghost-like, not a generalised dentine pattern.

Why is "Dentine dysplasia type I" not the answer?

Type I has rootless-appearing teeth with very short roots and obliterated chambers in both dentitions.

What concept does this question test?

It tests Tooth development and dental anatomy: dentine dysplasia type II in Dentistry. It is linked to DSPP. Type I has short roots and obliterated pulps.

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: dentine dysplasia type II?

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.