Deck 5: Principles of Bonding

Question 1

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

Answer 1

mechanical; chemical

Question 2

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.

Answer 2

Because brackets cannot be used with conventional cements, they must be bonded to the enamel using adhesive materials.

Question 3

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 3

but the dentin is left moist so that it glistens

Question 4

What is the purpose of a dental bonding?

A) Seal margins
B) Provide adhesion
C) Etch the enamel
D) Remove the smear layer

Question 5

Posts are placed within the roots of endodontically treated teeth to retain dental materials used to build up the teeth when:

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

Question 6

The oxygen-inhibited layer is a very thin coating of uncured resin:

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

Question 7

Which of the following statements is true concerning bond strength?

A) Bonding to enamel usually achieves consistently high bond strengths of around 60 MPa (megapascals).
B) The bond strength to dentin is usually greater than to enamel.
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 8

Dentin should be etched for:

A) 10 seconds
B) 20 seconds
C) 60 seconds
D) zero seconds, as etching creates postoperative sensitivity

Question 9

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

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

Question 10

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

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

Question 11

A dual-cure process for resin bonding agents:

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

Question 12

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

Question 13

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 14

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

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

Question 15

Silanes are used with which of the following dental materials?

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

Question 16

What is the wavelength of the curing light?

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

Question 17

Which of the following is true of the clinical technique for amalgam bonding?

A) The inner metal surface of the metal matrix band that will contact the amalgam should be coated with a thin layer of wax.
B) Enamel and dentin should not be etched.
C) Bonding resin should be cured before condensation of amalgam occurs.
D) Bonded amalgams are substitutes for crowns or inlays.

Question 18

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 19

Following etching, the dentin surface must be:

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

Question 20

Which of the following is true of the smear layer?

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

Question 21

Over-drying of the dentin after etching can cause:

A) dehydration
B) desiccation
C) tooth hypersensitivity
D) Both B and C

Question 22

Microleakage occurs when:

A) restorations are over-cured
B) the tooth is over-etched
C) contaminants are not removed
D) too much bond is used

Question 23

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

Question 24

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 25

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

Question 26

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 27

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

A) hydrophobic
B) hydrophilic
C) hydroelectric

Question 28

When a composite resin is polymerized, a small layer of uncured material will remain. This is the:

A) oxygen-inhibited layer
B) smear layer
C) hybrid layer
D) hydrophobic layer

Question 29

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 30

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 31

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 32

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

A) ameloblasts
B) osteoblasts
C) odontoblasts