Oral histology and anatomy: peritubular dentine: 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 · Oral histology and anatomy: peritubular dentine

Sample item

Ground sections of dentine show that the dentine immediately lining each tubule is more highly mineralised than the intertubular dentine. What is this lining called?

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

The answer and the reasoning

A. Peritubular dentine

Peritubular (intratubular) dentine lines the tubule wall and is more mineralised than the intertubular matrix. It can eventually occlude the tubule, as seen in sclerotic dentine.

Option by option

  • A. Peritubular dentine (correct)

    Correct. This hypermineralised lining is peritubular dentine.

  • B. Interglobular dentine

    Interglobular dentine represents areas of failed fusion of calcospherites.

  • C. Mantle dentine

    Mantle dentine is the first-formed layer just beneath enamel.

  • D. Predentine

    Predentine is the unmineralised layer next to the odontoblasts.

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, Peritubular dentine. Peritubular (intratubular) dentine lines the tubule wall and is more mineralised than the intertubular matrix.

Why is "Interglobular dentine" not the answer?

Interglobular dentine represents areas of failed fusion of calcospherites.

Why is "Mantle dentine" not the answer?

Mantle dentine is the first-formed layer just beneath enamel.

Why is "Predentine" not the answer?

Predentine is the unmineralised layer next to the odontoblasts.

What concept does this question test?

It tests Oral histology and anatomy: peritubular dentine in Dentistry. It can eventually occlude the tubule, as seen in sclerotic dentine.

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 Oral histology and anatomy: peritubular dentine?

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.