Deck 5: Principles of Bonding

Question 1

When are posts placed within the roots of endodontically treated teeth to retain dental materials used to build up the teeth?

A) When the root needs strengthening
B) When the crown-to-root ratio is poor
C) When a multi-rooted tooth is involved
D) When coronal tooth structure is inadequate for restoration with a crown

Answer 1

When coronal tooth structure is inadequate for restoration with a crown

Question 2

Excess water left from the etching procedure is removed by gentle drying with air:

A) until the dentin is bone dry.
B) but the dentin is left moist so that it glistens.
C) but the dentin should be left wet with etchant for bonding.
D) until a puddle of water remains in the bottom of the cavity preparation.

Answer 2

but the dentin is left moist so that it glistens.

Question 3

Which of the following is correct regarding the dual-cure process for resin bonding agents?

A) Requires activation by light
B) Requires chemical curing rather than activation by light
C) Neither can be activated by light nor cures chemically
D) Can be activated by light or can cure chemically without application of the curing light

Answer 3

Can be activated by light or can cure chemically without application of the curing light

Question 4

Which of the following materials would not be used when placing a direct resin restoration?

A) Bond
B) Etch
C) Cement
D) Curing light

Question 5

The etched surface of a permanent tooth should have a/an _____ appearance when dried.

A) frosty
B) opaque
C) darkened
D) transparent

Question 6

What is done to the dentinal surface following etching?

A) Dried to remove the smear layer
B) Dried to lower the surface tension
C) Left moist to keep the collagen fibrils fluffed up
D) Left moist to prevent oozing of fluid from the dentinal tubules

Question 7

The clinical technique of post cementation involves thoroughly rinsing off the phosphoric acid used to etch the canal and removing excess water with a:

A) paper point.
B) cotton pellet.
C) composite application brush.
D) 3-cc syringe with a blunt-end cannula.

Question 8

Which of the following correctly represents the sequence for tooth preparation before cementation of a post in an endodontically treated tooth?
1)Self-curing or dual-curing composite resin cement is applied to both the canal and the post.
2)A dentin primer is placed in the canal and air-dried to drive off any remaining water and the volatile solvents in the primer.
3)The prepared canal is etched with phosphoric acid,and then the acid is rinsed off.
4)Excess water is removed with a paper point.

A) 1,2,3,4
B) 1,2,4,3
C) 3,4,2,1
D) 4,3,1,2

Question 9

When a resin bonding agent hardens,it creates projections that lock into the tooth,creating a _____ bond.The resin bonding agent will then form a _____ bond to other resins placed over it,such as composite resin.

A) chemical;chemical
B) chemical;mechanical
C) mechanical;chemical
D) mechanical;mechanical

Question 10

Which of the following statements is true for bonding orthodontic brackets?

A) Orthodontic brackets have replaced bands for many uses,especially in the posterior part of the mouth.
B) Because brackets cannot be used with conventional cements,they must be bonded to the enamel using adhesive materials.
C) Only self-cured adhesive bonding resins can be used for bonding orthodontic brackets.
D) Orthodontic brackets must be directly bonded;there is no indirect method of application of brackets.

Question 11

Which etch or tooth conditioner is used when seating or repairing ceramic restorations?

A) Acetic acid
B) Phosphoric acid
C) Hydrochloric acid
D) Hydrofluoric acid

Question 12

The oxygen-inhibited layer is a very thin coating of uncured resin.Where is it found?

A) Within the dentinal tubules
B) At the base of the polymerized bonding resin
C) On the surface of the polymerized bonding resin
D) Within intertubular and peritubular dentin,but not within dentinal tubules

Question 13

For how many seconds should dentin be etched?

A) 10
B) 20
C) 40
D) 60

Question 14

What is the purpose of a dental bonding?

A) To seal margins
B) To etch the enamel
C) To provide adhesion
D) To remove the smear layer

Question 15

Which of the following statements is true concerning bond strength?

A) The bond strength to dentin is usually greater than to enamel.
B) Bonding to enamel usually achieves consistently high bond strengths of around 60 MPa (megapascals).
C) The dentin near the dentinoenamel junction (DEJ)has more dentinal tubules,and they are larger in diameter than in dentin closer to the pulp.
D) Wetter dentin with more holes is more difficult to bond to consistently than shallower dentin.

Question 16

Which of the following is true of the smear layer?

A) It is composed exclusively of bacterial plaque.
B) It is easily washed off with an air-water spray.
C) It forms on the external surface of uncut enamel.
D) It interferes with the formation of a bond to dentin and needs to be removed.

Question 17

Why should primary teeth be etched for longer periods of time than adult teeth?
1)The surface of the enamel has a prism pattern that is not well structured.
2)The enamel is considered aprismatic.
3)The enamel is less resistant to deep resin tag formation.
4)There is a greater likelihood of salivary contamination during etching.

A) 1,2,3,4
B) 1,2,3
C) 1,2
D) 3,4

Question 18

Silanes are used with which of the following dental materials?

A) Gold
B) Porcelain
C) Silver dental amalgam
D) Partial denture frameworks

Question 19

The most commonly used etchant or conditioner for tooth bonding is _____ in concentrations ranging from 10% to 38%.

A) acetic acid
B) phosphoric acid
C) hydrochloric acid
D) sodium perborate

Question 20

When acid etching for bonding,it is desirable to have a _____ surface energy and a _____ angle of contact.

A) high;high
B) high;low
C) low;high
D) low;low

Question 21

When would microleakage occur?

A) When too much bond is used
B) When the tooth is overetched
C) When restorations are overcured
D) When contaminants are not removed

Question 22

Match the items with the correct description below.
Hydrophobic

A)An attribute that allows a material to tolerate the presence of moisture
B)A bonding system that does not use a separate etching procedure with phosphoric acid
C)A resin/dentin layer formed by the intermixing of the dentin bonding agent with collagen fibrils exposed by acid etching
D)An attribute that does not allow a material to tolerate or perform well in the presence of moisture
E)A bonding system that includes etching of both enamel and dentin as a separate step from the application of bonding agents

Question 23

What is the wavelength of the curing light?

A) Blue
B) Ultraviolet
C) Incandescent
D) Fluorescent

Question 24

Overdrying of the dentin after etching can cause:

A) dehydration.
B) desiccation.
C) tooth hypersensitivity.
D) both b and c

Question 25

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

A) hydrophilic
B) hydrophobic
C) hydroelectric

Question 26

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

A)An attribute that allows a material to tolerate the presence of moisture
B)A bonding system that does not use a separate etching procedure with phosphoric acid
C)A resin/dentin layer formed by the intermixing of the dentin bonding agent with collagen fibrils exposed by acid etching
D)An attribute that does not allow a material to tolerate or perform well in the presence of moisture
E)A bonding system that includes etching of both enamel and dentin as a separate step from the application of bonding agents

Question 27

Match the items with the correct description below.
Hybrid layer

A)An attribute that allows a material to tolerate the presence of moisture
B)A bonding system that does not use a separate etching procedure with phosphoric acid
C)A resin/dentin layer formed by the intermixing of the dentin bonding agent with collagen fibrils exposed by acid etching
D)An attribute that does not allow a material to tolerate or perform well in the presence of moisture
E)A bonding system that includes etching of both enamel and dentin as a separate step from the application of bonding agents

Question 28

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

A) saliva.
B) blood.
C) both a and b
D) Neither is of concern.

Question 29

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

A) 5%
B) 18%
C) 24%
D) 37%

Question 30

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

A) Smear layer
B) Hybrid layer
C) Hydrophobic
D) Oxygen-inhibited layer

Question 31

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

A) ameloblasts
B) osteoblasts
C) odontoblasts

Question 32

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

Question 33

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

A)An attribute that allows a material to tolerate the presence of moisture
B)A bonding system that does not use a separate etching procedure with phosphoric acid
C)A resin/dentin layer formed by the intermixing of the dentin bonding agent with collagen fibrils exposed by acid etching
D)An attribute that does not allow a material to tolerate or perform well in the presence of moisture
E)A bonding system that includes etching of both enamel and dentin as a separate step from the application of bonding agents

Question 34

Match the items with the correct description below.
Hydrophilic

A)An attribute that allows a material to tolerate the presence of moisture
B)A bonding system that does not use a separate etching procedure with phosphoric acid
C)A resin/dentin layer formed by the intermixing of the dentin bonding agent with collagen fibrils exposed by acid etching
D)An attribute that does not allow a material to tolerate or perform well in the presence of moisture
E)A bonding system that includes etching of both enamel and dentin as a separate step from the application of bonding agents