CHAPTER 44: DENTAL LINERS, BASES & BONDING SYSTEMS

Question 1

What is a cavity liner

Answer 1

• placed in the deepest area of excavation of cavity preparation
• protects the pulpal tissue from irritation

Question 2

calcium hydroxide properties

Answer 2

• protects the pulp from irritation caused by physical, mechanical and biologic elements
• stimulation of secondary dentin
• It is compatible with all types of restorative materials.

Question 3

Types of cavity liners

Answer 3

calcium hydroxide

glass ionomer

Question 4

which liner is compatible with all restorative materials?

Answer 4

calcium hydroxide

Question 5

forms strong bond to dentin and reduces microleakage

Answer 5

glass ionomer

Question 6

What is a cavity sealer?

Answer 6

provides a protective layer within the PREPARED cavity.

Question 7

types of a cavity sealer

Answer 7

Varnish

Flouride varnish

Desensitizer

Question 8

has a higher fluoride concentration than any other fluoride marketed, being 5% or 22,600 ppm fluoride

Answer 8

fouride varnish

Question 9

a type of sealer that consists of one or more natural resins dissolved in an organic solvent

Answer 9

varnish

Question 10

application of varnish does what?

Answer 10

seals dentinal tubules

reduces microleakage around a restoration

protects the tooth from a highly acidic base (ie. zinc phosphate)

Question 11

the use of fluoride varnish are as follows:

Answer 11

• Professional fluoride application
• hypersensitivity
• Orthodontic patients
• Cavity varnish
• Dentin sealant

Question 12

when should varnish be applied?

Answer 12

after the liner is applied

Question 13

What does dental varnish interfere with ?

Answer 13

composite resin

glass ionomer restorations

Question 14

what is a desensitizer?

Answer 14

a type of sealer used to protect the tooth from hypersensitivity

Question 15

what is the difference between a varnish and a desensitizer?

Answer 15

The chemical makeup of the product.

desensitizer is made out hydroxyethyl methacrylate (HEMA) and glutaraldehyde

Question 16

in what areas of the tooth should a desensitizer NOT come in contact with ?

Answer 16

soft tissue

Question 17

What is a dental base?

Answer 17

placed before the permanent restorative material when a tooth preparation becomes moderately deep to deep.

Question 18

placed when it is necessary to protect the pulp before the restoration is placed. Without this protection, postoperative sensitivity and damage to the pulp may occur.

Answer 18

protective base

Question 19

placed in a deep cavity preparation to protect the tooth from thermal shock. (Thermal shock occurs when sudden temperature changes occur within the tooth.)

Answer 19

insulating bases

Question 20

base that help soothe a pulp that has been damaged by decay or has been irritated during the process of removing the decay.

Answer 20

sedative bases

Question 21

types of dental bases (cement bases):

Answer 21

Zinc oxide–eugenol (ZOE)

Zinc phosphate cement

Polycarboxylate cements

Glass ionomer cement

Question 22

cannot be used under composite resins, glass ionomers, or other resin restorations. The eugenol in the liquid will affect the setting process of the resin materials.

Answer 22

zinc oxide eugenol

Question 23

this liquid has a soothing effect on a painful, irritated pulp.

Answer 23

eugenol

Question 24

properties of zinc phosphate

Answer 24

• pros: thermal insulation qualities

- cons: acidic, irritating to the pulp

Question 25

can be selected for use as an
insulating base and as a
sedative base

Answer 25

Zinc oxide–eugenol

Question 26

which bases are nonirritating to the pulp and can be placed under all types of direct and indirect restorations.

Answer 26

Polycarboxylate

Question 27

where is the base applied during restoration

Answer 27

between the pulp and the restoration

The entire pulpal floor is covered with a base to a thickness of 1 to 2 mm

Question 28

what is a dental etchant?

Answer 28

prepares enamel for the attachment of a bonded restoration

Question 29

what is the tooth surface etched with

Answer 29

acidic tooth conditioner

Question 30

The preparation of a tooth surface is critical for both ____and _____ surfaces of a cavity preparation to form a better chemical bond between the tooth and the permanent restorative material.

Answer 30

enamel

dentin

Question 31

what is removed when etchant is applied to a tooth

Answer 31

smear layer

Question 32

how many seconds should an etchant be applied

Answer 32

15-20 seconds

Question 33

the process of attaining a solid and/or liquid contact of one material with another at a single margin

Answer 33

dental bonding

Question 34

types of dental bonding

Answer 34

enamel bonding

dentin bonding

Question 35

examples of enamel bonding

Answer 35

placement of sealants, braces, and use of resin bonded bridges.

Question 36

what does enamel bonding do

Answer 36

bonds dental materials to the enamel by hardening them into place

Question 37

A major factor in the success of bonding a material to dentin is the removal of what ?

Answer 37

smear layer

Question 38

thin layer (5–10 microns) of debris composed of fluids and tooth components that remain on the dentin after cavity preparation has been completed

Answer 38

smear layer

Question 39

why is the smear layer removed before dentin bonding?

Answer 39

allows the dentin tubules to become opened for the bonding material to flow into.

Question 40

process of removing smear layer

Answer 40

application of an etchant

Question 41

If dentin is completely dried, the tooth structure could be harmed. TRUE OR FALSE

Answer 41

TRUE

Question 42

The following general description outlines what occurs in the bonding system:

Answer 42

tooth receives etchant which removes smear layer

hardens and acts as a hybrid layer

or

remain in a liquid state while restoration is being placed.

Question 43

one of the most frequently selected types of cavity liner

Answer 43

calcium hydroxide