EXERCISES, LESSON 3
INSTRUCTIONS: Answer the following exercises by marking the lettered response that
best answers the question or best completes the incomplete or by writing the answer in
the space provided.
After you have completed all the exercises, turn to "Solutions to Exercises" at the
end of the lesson and check your answers.
1.
Select the dental material below that is one part calcium sulfate and two parts
water.
a. Hydrocolloid impression materials.
b. Calcium hydroxide.
c.
Modeling plastic.
d. Dental wax.
e. Gypsum.
2.
Which of the following cast materials is processed by steam heat under pressure?
a. Plaster of Paris.
b. Artificial stone.
3.
What percentage of water is removed from the raw material to produce plaster of
Paris or artificial stone?
a. 100 percent.
b. 75 percent.
c.
50 percent.
d. 33 percent.
MD0502
3-11
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