Dental materials and radiology: addition silicone 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: addition silicone impression

Sample item

A dentist needs the most dimensionally stable impression material for a crown, allowing the cast to be poured days later. Which is most suitable?

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

The answer and the reasoning

C. Addition silicone (polyvinyl siloxane)

Polyvinyl siloxane has excellent accuracy and dimensional stability because no by-product is released on setting. Alginate loses or gains water and must be poured at once.

Option by option

  • A. Zinc oxide eugenol paste

    ZOE paste is used for wash impressions in edentulous mouths.

  • B. Impression compound

    Compound is a rigid thermoplastic for edentulous impressions.

  • C. Addition silicone (polyvinyl siloxane) (correct)

    Correct. Addition silicone is stable and accurate.

  • D. Irreversible hydrocolloid

    Alginate distorts through syneresis and imbibition.

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, Addition silicone (polyvinyl siloxane). Polyvinyl siloxane has excellent accuracy and dimensional stability because no by-product is released on setting.

Why is "Zinc oxide eugenol paste" not the answer?

ZOE paste is used for wash impressions in edentulous mouths.

Why is "Impression compound" not the answer?

Compound is a rigid thermoplastic for edentulous impressions.

Why is "Irreversible hydrocolloid" not the answer?

Alginate distorts through syneresis and imbibition.

What concept does this question test?

It tests Dental materials and radiology: addition silicone impression in Dentistry. Alginate loses or gains water and must be poured at once.

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 Dental materials and radiology: addition silicone 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.