Impression Materials

Question 1

how do you mix alginate

Answer 1

1 scoop to 1 water measure (mix with spatula as little as possible until uniform colour and consistency is seen)

Question 2

what kind of impression material is alginate

Answer 2

irreversible hydrocolloid/elastic

Question 3

what is alginates setting reaction?

Answer 3

sodium alginate + calcium sulphate -> sodium sulphate + calcium alginate

trisodium phosphate is used to slow it as it reacts preferentially with calcium sulphate to form a gel until trisodium phosphate is used up so alginate sets as a gel