CHAPTER 44: DENTAL LINERS, BASES & BONDING SYSTEMS Flashcards

1
Q

What is a cavity liner

A
  • placed in the deepest area of excavation of cavity preparation

-protects the pulpal tissue from irritation

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2
Q

calcium hydroxide properties

A

-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.
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3
Q

Types of cavity liners

A

calcium hydroxide

glass ionomer

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4
Q

which liner is compatible with all restorative materials?

A

calcium hydroxide

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5
Q

forms strong bond to dentin and reduces microleakage

A

glass ionomer

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6
Q

What is a cavity sealer?

A

provides a protective layer within the PREPARED cavity.

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7
Q

types of a cavity sealer

A

Varnish

Flouride varnish

Desensitizer

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8
Q

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

A

fouride varnish

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9
Q

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

A

varnish

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10
Q

application of varnish does what?

A

seals dentinal tubules

reduces microleakage around a restoration

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

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11
Q

the use of fluoride varnish are as follows:

A

• Professional fluoride application

•hypersensitivity

• Orthodontic patients

• Cavity varnish

• Dentin sealant

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12
Q

when should varnish be applied?

A

after the liner is applied

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13
Q

What does dental varnish interfere with ?

A

composite resin

glass ionomer restorations

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14
Q

what is a desensitizer?

A

a type of sealer used to protect the tooth from hypersensitivity

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15
Q

what is the difference between a varnish and a desensitizer?

A

The chemical makeup of the product.

desensitizer is made out hydroxyethyl methacrylate (HEMA) and glutaraldehyde

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16
Q

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

A

soft tissue

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17
Q

What is a dental base?

A

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

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18
Q

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.

A

protective base

19
Q

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

A

insulating bases

20
Q

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

A

sedative bases

21
Q

types of dental bases (cement bases):

A

Zinc oxide–eugenol (ZOE)

Zinc phosphate cement

Polycarboxylate cements

Glass ionomer cement

22
Q

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.

A

zinc oxide eugenol

23
Q

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

A

eugenol

24
Q

properties of zinc phosphate

A

-pros: thermal insulation qualities

-cons: acidic, irritating to the pulp

25
Q

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

A

Zinc oxide–eugenol

26
Q

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

A

Polycarboxylate

27
Q

where is the base applied during restoration

A

between the pulp and the restoration

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

28
Q

what is a dental etchant?

A

prepares enamel for the attachment of a bonded restoration

29
Q

what is the tooth surface etched with

A

acidic tooth conditioner

30
Q

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.

A

enamel
dentin

31
Q

what is removed when etchant is applied to a tooth

A

smear layer

32
Q

how many seconds should an etchant be applied

A

15-20 seconds

33
Q

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

A

dental bonding

34
Q

types of dental bonding

A

enamel bonding

dentin bonding

35
Q

examples of enamel bonding

A

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

36
Q

what does enamel bonding do

A

bonds dental materials to the enamel by hardening them into place

37
Q

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

A

smear layer

38
Q

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

A

smear layer

39
Q

why is the smear layer removed before dentin bonding?

A

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

40
Q

process of removing smear layer

A

application of an etchant

41
Q

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

A

TRUE

42
Q

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

A

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.

43
Q

one of the most frequently selected types of cavity liner

A

calcium hydroxide