An impression material that can be heated to become a fluid and then cooled to a gel to take impressions is known as which material?

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Multiple Choice

An impression material that can be heated to become a fluid and then cooled to a gel to take impressions is known as which material?

Temperature-driven, reversible gelation is being tested here. Reversible hydrocolloid (agar) can be heated to a fluid and then cooled to form a gel, which is why it’s used to take impressions in a reversible, repeatable way. This property—liquefying with heat and gelling on cooling—is unique to this material among the options. Alginate is an irreversible hydrocolloid; it sets by a chemical reaction and cannot be liquefied and re-gelled by heating for reuse. Zinc oxide eugenol is a paste-based impression material that sets chemically and isn’t used by heating to a gel. Polyether is an elastomeric impression material that sets by polymerization and does not undergo reversible heating to gel.

Temperature-driven, reversible gelation is being tested here. Reversible hydrocolloid (agar) can be heated to a fluid and then cooled to form a gel, which is why it’s used to take impressions in a reversible, repeatable way. This property—liquefying with heat and gelling on cooling—is unique to this material among the options.

Alginate is an irreversible hydrocolloid; it sets by a chemical reaction and cannot be liquefied and re-gelled by heating for reuse. Zinc oxide eugenol is a paste-based impression material that sets chemically and isn’t used by heating to a gel. Polyether is an elastomeric impression material that sets by polymerization and does not undergo reversible heating to gel.

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