Oral histology and anatomy: acellular extrinsic fibre cementum: 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: acellular extrinsic fibre cementum

Sample item

Which type of cementum covers the cervical two-thirds of the root, contains no cells and carries the main Sharpey's fibres that anchor the tooth?

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

The answer and the reasoning

B. Acellular extrinsic fibre cementum

Acellular extrinsic fibre cementum is formed slowly with the eruption of the tooth and is the main attachment tissue, with Sharpey's fibres embedded in it. Cellular intrinsic fibre cementum forms in repair of resorption, and the mixed stratified type lies in the apical region and furcations.

Option by option

  • A. Acellular afibrillar cementum

    Acellular afibrillar cementum forms small patches on enamel near the cementoenamel junction.

  • B. Acellular extrinsic fibre cementum (correct)

    Correct. This cementum anchors the tooth through embedded extrinsic fibres.

  • C. Cellular intrinsic fibre cementum

    Cellular intrinsic fibre cementum fills in resorption defects and is not the main anchor.

  • D. Cellular mixed stratified cementum

    Cellular mixed stratified cementum lies in the apical third and furcations.

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 B, Acellular extrinsic fibre cementum. Acellular extrinsic fibre cementum is formed slowly with the eruption of the tooth and is the main attachment tissue, with Sharpey's fibres embedded in it.

Why is "Acellular afibrillar cementum" not the answer?

Acellular afibrillar cementum forms small patches on enamel near the cementoenamel junction.

Why is "Cellular intrinsic fibre cementum" not the answer?

Cellular intrinsic fibre cementum fills in resorption defects and is not the main anchor.

Why is "Cellular mixed stratified cementum" not the answer?

Cellular mixed stratified cementum lies in the apical third and furcations.

What concept does this question test?

It tests Oral histology and anatomy: acellular extrinsic fibre cementum in Dentistry. Cellular intrinsic fibre cementum forms in repair of resorption, and the mixed stratified type lies in the apical region and furcations.

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 Oral histology and anatomy: acellular extrinsic fibre cementum?

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.