Tooth development and dental anatomy: cleidocranial dysplasia: 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: cleidocranial dysplasia

Sample item

A 10-year-old can bring both shoulders together in front of the chest, has frontal bossing and open fontanelles, and retained primary teeth with unerupted supernumerary teeth. What is the diagnosis?

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

The answer and the reasoning

C. Cleidocranial dysplasia

Cleidocranial dysplasia is caused by RUNX2 mutation and features absent or hypoplastic clavicles, delayed suture closure and multiple unerupted supernumerary teeth. Primary teeth are often retained.

Option by option

  • A. Apert syndrome

    Apert syndrome features craniosynostosis and syndactyly.

  • B. Gardner syndrome

    Gardner syndrome shows osteomas and colonic polyps, and supernumerary teeth less characteristically.

  • C. Cleidocranial dysplasia (correct)

    Correct. Hypermobile shoulders with dental retention and extra teeth fit this disorder.

  • D. Treacher Collins syndrome

    Treacher Collins syndrome shows malar hypoplasia and ear anomalies.

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 C, Cleidocranial dysplasia. Cleidocranial dysplasia is caused by RUNX2 mutation and features absent or hypoplastic clavicles, delayed suture closure and multiple unerupted supernumerary teeth.

Why is "Apert syndrome" not the answer?

Apert syndrome features craniosynostosis and syndactyly.

Why is "Gardner syndrome" not the answer?

Gardner syndrome shows osteomas and colonic polyps, and supernumerary teeth less characteristically.

Why is "Treacher Collins syndrome" not the answer?

Treacher Collins syndrome shows malar hypoplasia and ear anomalies.

What concept does this question test?

It tests Tooth development and dental anatomy: cleidocranial dysplasia in Dentistry. Primary teeth are often retained.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. 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: cleidocranial dysplasia?

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.