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14 February, 06:20

1. Alginate is

a. Reversible Hydrocolloid impression material

b. Irreversible Hydrocolloid impression material

c. Polysulfideimpression material

d. Polyvinyl siloxane impression material

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  1. 14 February, 08:25
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    Option b, Irreversible hydrocolloid impression material

    Explanation:

    Irreversible is used as an impression material to take impression from edentulous jaws. It is also used in wound healing and drug delivery.

    Alginate is a natural polymer found in cell wall of brown seaweed.

    Its monomers are β-D-mannuronate and α-L-guluronate.

    In association with Ca2+, it forms gel. It is hydrophilic in nature.
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