4.
Which of the following has particles that are rough, irregular, and porous?
a. Plaster of Paris.
b. Artificial stone.
5.
The psi for artificial stone is:
a. 2,600.
b. 5,000.
c.
7,500.
d. 12,000.
6.
Match the use or description of the product in Column I to the product in Column II.
Write your answers in the spaces provided.
COLUMN I
COLUMN II
(1) ____
a.
Plaster of Paris
Make hard, strong master casts
b.
Artificial stone
(2) ____
Make matrices for prosthodontic
(3) ____
Make hard, strong dies
(4) ____
Attach casts to articulators
(5) ____
Prismatic, more regular in shape, dense,
nonporous.
(6) ____
Rough, irregular, porous.
MD0502
3-12