8 - Alginate Impression Material

Question 1

8.2 What is the most accurate way to dispense alginate impression material?

Answer 1

Weighing the powder

Question 2

8.3 What role does sodium phosphate play in alginate impression material?

Answer 2

It is a retarder - it delays the final reaction from occurring, prolonging the working time.

Question 3

8.13 What are the three environmental factors that impact the ideal properties of alginate impression material?

Answer 3

1. Syneresis - fluid loss (shrinkage and distortion)
2. Imbibition - water absorption (expansion)
3. Evaporation - fluid loss (shrinkage)