Question 1

When would microleakage occur?

Accepted Answer

Contaminants can contribute to microleakage when they are not properly removed before and during the bonding process.

Question 2

Match the items with the correct description below.
-Hydrophobic

Accepted Answer

Hydrophobic refers to the property of a substance that repels water or does not mix well with water, hence an attribute that does not allow a material to tolerate or perform well in the presence of moisture.

Question 3

What is the wavelength of the curing light?

Accepted Answer

The second is a light-cure process that uses a light in the blue wave range to activate a chemical (photo-initiator)that sets off the polymerization reaction or curing process.

Question 4

Overdrying of the dentin after etching can cause:

Accepted Answer

The following conditions can contribute to sensitivity: The tooth has been overdried (desiccated)during the bonding process,trapping air in the dentinal tubules;when the patient bites down,the restoration compresses the dentin,putting pressure on the air in the tubules.

Question 5

The primer portion of the dental bonding agent is _____ to water.

Accepted Answer

A primer is more important on dentin than enamel because the primer contains hydrophilic (water-loving)groups that penetrate wet,etched dentin.

Question 6

Match the items with the correct description below.
-Self-etch system

Accepted Answer

Self-etch system is a bonding system that does not use a separate etching procedure with phosphoric acid.

Answer: C
 A resin/dentin layer formed by the intermixing of the dentin bonding agent with collagen fibrils exposed by acid etching is known as the hybrid layer, which is formed by the self-etch system.

Answer: D
 An attribute that does not allow a material to tolerate or perform well in the presence of moisture is known as hydrophobic.

Answer: E
 A bonding system that includes etching of both enamel and dentin as a separate step from the application of bonding agents is known as total-etch system.

Question 7

Match the items with the correct description below.
-Hybrid layer

Accepted Answer

The hybrid layer is a resin/dentin layer formed by the intermixing of the dentin bonding agent with collagen fibrils exposed by acid etching, which is crucial for the adhesion of restorative materials to dentin.

Question 8

Contaminants on the surface of the tooth can greatly affect the longevity of the restoration and may include:

Accepted Answer

Contaminants on the surface,such as saliva or blood,can dramatically lower the strength of the bond to the enamel.

Question 9

Etch gel is typically a/an _____ solution of phosphoric acid.

Accepted Answer

The enamel of permanent teeth is usually etched for 20 to 30 seconds with 37% phosphoric acid.

Question 10

When a composite resin is polymerized,a small layer of uncured material will remain.What is this called?

Accepted Answer

On the surface of the polymerized bonding resin is a thin coating of uncured resin,which is called the oxygen-inhibited layer.

Question 11

Hypersensitivity may occur when _____ are irritated by procedures or chemicals associated with composite resin restorations.

Accepted Answer

Some patients may experience transient tooth sensitivity after a bonded restoration is placed.This usually lasts for only a short time,a few hours to a few days.The pain response comes from odontoblasts that lie in the pulp at its junction with the dentin.

Question 12

What are the three modes of curing for resin bonding agents?

Accepted Answer

The answer of What are the three modes of curing...

Question 13

Match the items with the correct description below.
-Total-etch system

Accepted Answer

Total-etch systems involve etching both enamel and dentin as separate steps before the application of bonding agents, which is why option E is the correct match.

Question 14

Match the items with the correct description below.
-Hydrophilic

Accepted Answer

Hydrophilic means the material can tolerate the presence of moisture.

Answer: B
 Self-etching bonding systems do not require a separate etching procedure with phosphoric acid.

Answer: C
 The resin/dentin layer formed by the intermixing of the dentin bonding agent with collagen fibrils exposed by acid etching is called the hybrid layer.

Answer: D
 Hydrophobic means that the material does not tolerate or perform well in the presence of moisture.

Answer: E
 Total-etch bonding systems include etching of both enamel and dentin as a separate step from the application of bonding agents.

Quiz 5: Principles of Bonding

When would microleakage occur?

Match the items with the correct description below. -Hydrophobic

What is the wavelength of the curing light?

Overdrying of the dentin after etching can cause:

The primer portion of the dental bonding agent is _____ to water.

Match the items with the correct description below. -Self-etch system

Match the items with the correct description below. -Hybrid layer

Contaminants on the surface of the tooth can greatly affect the longevity of the restoration and may include:

Etch gel is typically a/an _____ solution of phosphoric acid.

When a composite resin is polymerized,a small layer of uncured material will remain.What is this called?

Hypersensitivity may occur when _____ are irritated by procedures or chemicals associated with composite resin restorations.

What are the three modes of curing for resin bonding agents?

Match the items with the correct description below. -Total-etch system

Match the items with the correct description below. -Hydrophilic