ADAP Dental Materials 3

Question 1

Which property of wax allows it to be shaped by hand pressure and retain that shape at room temperature?

Accepted Answer

Plasticity

Answer

Plasticity is the property that allows wax to be permanently deformed under stress and maintain the new shape once pressure is removed.

Question 2

A provisional crown material that sets via an exothermic reaction and requires removal from the mouth during polymerization is most likely:

Accepted Answer

PMMA (polymethyl methacrylate) acrylic

Answer

PMMA acrylic generates significant exothermic heat during polymerization and must be removed and replaced in water repeatedly to protect the pulp.

Question 3

The working time of an impression material is defined as:

Accepted Answer

Time available from the start of mixing until insertion must be complete

Answer

Working time is the period from the start of mixing during which the material can be manipulated and loaded into the tray before insertion.

Question 4

Which dental cement is contraindicated as a base under composite resin restorations?

Accepted Answer

Zinc oxide eugenol (ZOE)

Answer

Eugenol in ZOE cement inhibits the polymerization of composite resin, preventing proper curing when the two materials contact each other.

Question 5

What does the term 'snap set' describe in alginate impression material?

Accepted Answer

A rapid, abrupt change from sol to gel state

Answer

Snap set refers to alginate's characteristic rapid transition from a flowable sol to a firm gel with little intermediate stage.

(ADAP) Alternative Dental Assisting Program Practice Test