ADAP Dental Materials 2

Question 1

Which type of impression material is considered irreversible hydrocolloid?

Accepted Answer

Alginate

Answer

Alginate is an irreversible hydrocolloid because its chemical gel cannot be re-liquefied after setting.

Question 2

What is the primary purpose of a cavity varnish in restorative dentistry?

Accepted Answer

To seal dentinal tubules and reduce microleakage under amalgam

Answer

Cavity varnish seals dentinal tubules to reduce microleakage and postoperative sensitivity, particularly under amalgam restorations.

Question 3

Type IV gypsum (die stone) differs from Type III dental stone primarily in its:

Accepted Answer

Higher strength and lower expansion

Answer

Type IV die stone has higher compressive strength and lower setting expansion than Type III, making it ideal for accurate dies.

Question 4

Which component of composite resin provides the filler-matrix bond?

Accepted Answer

Silane coupling agent

Answer

The silane coupling agent chemically bonds the inorganic filler particles to the organic resin matrix in composite materials.

Question 5

A patient's custom tray is fabricated with relief wax over the edentulous ridge. What is the purpose of this relief?

Accepted Answer

To create space for a controlled thickness of final impression material

Answer

Relief wax creates uniform spacing between the tray and tissues so the impression material flows evenly and records details accurately.

(ADAP) Alternative Dental Assisting Program Practice Test