Dental materials and radiology basics: polyether impression: 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 · Dental materials and radiology basics: polyether impression

Sample item

Which elastomeric impression material is stiff, hydrophilic and distorts if stored in water or humid conditions?

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

The answer and the reasoning

C. Polyether

Polyether is hydrophilic and rigid and absorbs water, so it should be stored dry. Its stiffness makes removal from undercuts difficult.

Option by option

  • A. Addition silicone

    Addition silicone is hydrophobic and very stable.

  • B. Condensation silicone

    Condensation silicone shrinks as alcohol evaporates and is hydrophobic.

  • C. Polyether (correct)

    Correct. Polyether absorbs water and swells.

  • D. Polysulphide

    Polysulphide is hydrophobic and has long working time.

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, Polyether. Polyether is hydrophilic and rigid and absorbs water, so it should be stored dry.

Why is "Addition silicone" not the answer?

Addition silicone is hydrophobic and very stable.

Why is "Condensation silicone" not the answer?

Condensation silicone shrinks as alcohol evaporates and is hydrophobic.

Why is "Polysulphide" not the answer?

Polysulphide is hydrophobic and has long working time.

What concept does this question test?

It tests Dental materials and radiology basics: polyether impression in Dentistry. Its stiffness makes removal from undercuts difficult.

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: polyether impression?

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.