Tooth development and dental anatomy: dentinogenesis imperfecta with osteogenesis imperfecta: 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: dentinogenesis imperfecta with osteogenesis imperfecta

Sample item

A child has blue sclerae, multiple long bone fractures after minor falls, and grey-brown opalescent primary teeth with bulbous crowns. Which dental condition is associated with this systemic disease?

ADentinogenesis imperfecta type IBRegional odontodysplasiaCAmelogenesis imperfecta hypoplastic typeDDentine dysplasia type I

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

The answer and the reasoning

A. Dentinogenesis imperfecta type I

Shields type I dentinogenesis imperfecta occurs together with osteogenesis imperfecta, a collagen I disorder. Types II and III occur without bone disease. The teeth show opalescence, bulbous crowns and pulp obliteration.

Option by option

A. Dentinogenesis imperfecta type I (correct)
Correct. Type I dentinogenesis imperfecta accompanies osteogenesis imperfecta.
B. Regional odontodysplasia
Regional odontodysplasia is localised to one quadrant and is not linked to fractures.
C. Amelogenesis imperfecta hypoplastic type
Amelogenesis imperfecta affects enamel and is not part of a bone fragility disorder.
D. Dentine dysplasia type I
Dentine dysplasia type I has rootless teeth with normal colour and no bone fragility.

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.

Questions about this Dentistry question

What is the answer to this Dentistry question?

The best answer is A, Dentinogenesis imperfecta type I. Shields type I dentinogenesis imperfecta occurs together with osteogenesis imperfecta, a collagen I disorder.

Why is "Regional odontodysplasia" not the answer?

Regional odontodysplasia is localised to one quadrant and is not linked to fractures.

Why is "Amelogenesis imperfecta hypoplastic type" not the answer?

Amelogenesis imperfecta affects enamel and is not part of a bone fragility disorder.

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

Dentine dysplasia type I has rootless teeth with normal colour and no bone fragility.

What concept does this question test?

It tests Tooth development and dental anatomy: dentinogenesis imperfecta with osteogenesis imperfecta in Dentistry. Types II and III occur without bone disease. The teeth show opalescence, bulbous crowns and pulp obliteration.

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: dentinogenesis imperfecta with osteogenesis imperfecta?

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.