A final impression for a crown will not be poured until the next day at the laboratory. Which impression material is most appropriate?

  • Correct answer

    Addition silicone (polyvinyl siloxane)

  • Condensation silicone

  • Polysulfide

  • Irreversible hydrocolloid (alginate)

This question is one of 15 in AFK practice: Restorative, prosthodontics and implants. Test yourself on all of them.

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Explanations

  • Addition silicones have no volatile by-product and are the most dimensionally stable elastomers, allowing delayed pouring. Condensation silicone releases ethyl alcohol and shrinks over time, and alginate distorts quickly through syneresis and imbibition.

    Source: Sakaguchi and Powers, Craig's Restorative Dental Materials — oneguy

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