8Algenate

Question 1

What is the most accurate method for getting the correct amount of alginate powder?

Answer 1

WEIGHING (not scooping!!!) (Are you going to purchase packets when you are a dentist??)

Question 2

What innate ingredient in alginate is used as a retarder and is used up first in the reaction?

Answer 2

Sodium Phosphate

Question 3

ASIDE: Alginic Acid is a mucus extraction of ______ (_____).

Answer 3

Seaweed (algae)

Question 4

ASIDE: What is the order of water and powder? Why??

Answer 4

Water FIRST, then powder (minimizes AIR entrapment)

Question 5

What are the three environmental factors of Alginate?

Answer 5

1.Syneresis 2.Imbibition 3.Evaporation

Question 6

________ is fluid loss during setting, squeezing water from between polysaccharide or alginate chains which leads to ______ AND _______ of the cast.

Answer 6

SYN-ERE-SIS…..Shrinkage AND Distortion

Question 7

What is the difference between Evaporation and Syneresis in alginate?

Answer 7

Syneresis=SQUEEZING out of Water=Shrink AND DISTORTION…Evaporation: DUE TO ENVIRONMENT (Temp, just SHRINK, humidity also a factor)

Question 8

What is the uptake of water in gel leading to EXPANSION?

Answer 8

Im-BIB-ition (DRANK UP YO!)

Question 9

Does wrapping the impression in a wet paper towel effect Syneresis or Evaporation?

Answer 9

Evaporation- to retard dimensional changes (shrinkage)