NBDHE NBDHE Dental Materials and Procedures 3

Question 1

Which component of composite resin is responsible for coupling the filler particles to the resin matrix?

Accepted Answer

Silane coupling agent

Answer

The silane coupling agent chemically bonds the inorganic filler particles to the organic resin matrix, improving the mechanical properties of the composite.

Question 2

What is the primary reason that bonding agents are applied in multiple coats when using total-etch technique?

Accepted Answer

To compensate for oxygen inhibition of the outer layer

Answer

The outermost layer of bonded resin remains uncured due to oxygen inhibition, so multiple coats ensure a fully polymerized bonding layer beneath.

Question 3

Galvanic shock between two dissimilar metals in the mouth occurs due to which electrochemical process?

Accepted Answer

Current flow from the less noble to the nobler metal through the electrolyte

Answer

When two dissimilar metals contact in saliva (an electrolyte), current flows from the less noble (anode) to the nobler metal (cathode), causing the patient to feel a galvanic shock.

Question 4

When using alginate impression material, what is the effect of using warmer water during mixing?

Accepted Answer

Decreases setting time

Answer

Warmer water accelerates the chemical reaction in alginate, decreasing the setting time and reducing the working time available to the clinician.

Question 5

Which cement is most biocompatible and has the ability to release fluoride, making it ideal under restorations near the pulp?

Accepted Answer

Glass ionomer cement

Answer

Glass ionomer cement releases fluoride, has good biocompatibility, and bonds chemically to tooth structure, making it an excellent liner or base near the pulp.

NBDHE Test Practice Test

NBDHE Test Practice Test

NBDHE NBDHE Dental Materials and Procedures 3