Gypsum Flashcards
1
Q
What is lost of gloss?
A
When the mixed and poured material loses its sheen & should not be manipulated further
2
Q
How long should the model be soaked before trimming it?
A
5 min
3
Q
How soon should an impression be poured into a model or cast?
A
Ideally right away
Or as soon as manufacturers permit
4
Q
List chem name:
Plaster
A
Beta calcium sulfate
5
Q
List chem name: Stone class 1
A
Alpha calcium sulfate
6
Q
List chem name: Improved stone class 2
A
Modified alpha calcium sulfate
7
Q
What might be on an impression which could retard the set of stone or plaster?
A
Blood
Saliva
Debri
8
Q
When trimming a gypsum poured model _____ distance from tissues should exist. (mm)
A
3mm space
