Dental materials and radiology basics: hybrid layer: 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.

Try it

Dentistry · Dental materials and radiology basics: hybrid layer

Sample item

In dentine bonding, acid etching exposes a collagen network in the dentine, which is then infiltrated by resin. What is the resulting structure called?

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

The answer and the reasoning

A. Hybrid layer

The hybrid layer, described by Nakabayashi, is a zone of resin-reinforced collagen and dentine that forms the micromechanical bond to dentine. The smear layer is debris left after cutting and is removed or modified by etchants. The oxygen inhibition layer is the unpolymerised surface of the composite.

Option by option

  • A. Hybrid layer (correct)

    Correct. Resin interlocked with demineralised collagen forms the hybrid layer.

  • B. Oxygen inhibition layer

    The oxygen inhibition layer is a tacky layer on cured resin.

  • C. Pellicle

    Pellicle is a salivary protein film on enamel.

  • D. Smear layer

    The smear layer is cutting debris, not resin-collagen.

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.

More Dentistry questions

Questions about this Dentistry question

What is the answer to this Dentistry question?

The best answer is A, Hybrid layer. The hybrid layer, described by Nakabayashi, is a zone of resin-reinforced collagen and dentine that forms the micromechanical bond to dentine.

Why is "Oxygen inhibition layer" not the answer?

The oxygen inhibition layer is a tacky layer on cured resin.

Why is "Pellicle" not the answer?

Pellicle is a salivary protein film on enamel.

Why is "Smear layer" not the answer?

The smear layer is cutting debris, not resin-collagen.

What concept does this question test?

It tests Dental materials and radiology basics: hybrid layer in Dentistry. The smear layer is debris left after cutting and is removed or modified by etchants. The oxygen inhibition layer is the unpolymerised surface of the composite.

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 Dental materials and radiology basics: hybrid layer?

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.