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OPEDENT > CAVITY LINERS AND BASES > Flashcards

CAVITY LINERS AND BASES Flashcards

1
Q

thin layers of material used primarily to provide a barrier to protect the dentin from residual reactants diffusing out of a restoration and/or fluids which may penetrate leaky tooth-restoration interface

A

LINERS

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2
Q

LINERS FUNCTIONS [4]

A

→ chemical insulator
→ stimulate formation of tertiary dentin
→ sterilize residual carious dentin with its anti-bacterial action
→ direct and indirect pulp capping

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3
Q

insulating materials that provide thermal protection for the pulp and to supplement mechanical support for the restoration by distributing local stresses from the restoration across the underlying dentin surface

A

BASES

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4
Q

BASES FUNCTIONS [3]

A

→ thermal insulation
→ mechanical insulation
→ provides strong support during insertion of permanent
restorations

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5
Q

MATERIALS USED AS CAVITY LINERS AND BASES [6]

A

→ Zinc Oxide Eugenol Cement
→ Calcium Hydroxide
→ Zinc Phosphate Cement
→ Polycarboxylate Cement
→ Varnishes
→ Glass Ionomer Cement (GI)

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6
Q

zinc oxide

A. Powder
B. Liquid

A

A

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7
Q

eugenol

A. Powder
B. Liquid

A

B

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8
Q

setting time acceleration:

ZINC OXIDE EUGENOL CEMENT

A

o increase powder-liquid ratio
o increase temperature and humidity
o adding water to the mix after mixing is complete and
seated in the preparation

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9
Q

T/ F

ZINC OXIDE EUGENOL CEMENT increase pressure, movement, and time during mixing

A

T

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10
Q

T/ F

ZINC OXIDE EUGENOL CEMENT
Has least amount of shrinkage
And least irritating

A

T

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11
Q

T/ F

ZINC OXIDE EUGENOL CEMENT thermal insulation at 0.25 mm thickness

A

T

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12
Q

T/ F

ZINC OXIDE EUGENOL CEMENT cannot be used as a base for composite because it can inhibit polymerization

A

T

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13
Q

T/ F

CALCIUM HYDROXIDE has 2 paste system, the Acidic Paste and Basic Paste

A

T

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14
Q

T/ F

CALCIUM HYDROXIDE packing factor is high; mass is porous

A

False

(packing factor is LOW; mass is porous)

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15
Q

used as a subbase

A

CALCIUM HYDROXIDE

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16
Q

0.5 mm-1.0 mm thickness is sufficient to treat a near or actual pulp exposure

A

CALCIUM HYDROXIDE

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17
Q

T/ F

CALCIUM HYDROXIDE
pulp tissue in contact with CaOH will undergo coagulation
(necrosis)

A

T

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18
Q

alkyl salicylate + filler

A. Acidic Paste
B. Basic Paste

A

A

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19
Q

calcium hydroxide

A. Acidic Paste
B. Basic Paste

A

B

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20
Q

promotes secondary dentin formation

A

CALCIUM HYDROXIDE

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21
Q

resinous solution in which calcium hydroxide and zinc oxide are suspended

A

FORMS OF CAVITY LINER

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22
Q

aqueous solution of calcium hydroxide in methyl cellulose or hydroxyethyl cellulose base

A

FORMS OF CAVITY LINER

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23
Q

resinous solution that is light-activated

A

FORMS OF CAVITY LINER

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24
Q

ZINC PHOSPHATE CEMENT Powder Form

A

zinc oxide with magnesium oxide + tribismuth oxide + silicon dioxide

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25
Q

ZINC PHOSPHATE CEMENT Liquid form

A

45-55% orthophosphoric acid

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26
Q

most irritating of all intermediary bases

A

ZINC PHOSPHATE CEMENT

27
Q

used as a base and luting agent

A

ZINC PHOSPHATE CEMENT

28
Q

acid is neutralized by dentin

A

ZINC PHOSPHATE CEMENT

29
Q

highest compressive strength of
ZINC PHOSPHATE CEMENT

A

12,000-17,000 PSI

30
Q

POLYCARBOXYLATE CEMENT Powder form

A

zinc oxide with magnesium oxide + alumina

31
Q

POLYCARBOXYLATE CEMENT Liquid form

A

40-50% polyacrylic acid

32
Q

compressive strength: of POLYCARBOXYLATE CEMENT

A

7,000-9,000 PSI

33
Q

irritant to pulp dentin organ

A

POLYCARBOXYLATE CEMENT

34
Q

T/ F

POLYCARBOXYLATE CEMENT effective thermal insulation in thickness of 1.5 mm

35
Q

an organic copal or resin gum suspended in solutions of ether and chloroform

36
Q

used to line the cavity preparation for amalgam in order to improve the marginal and cavity wall seal

37
Q

under amalgam, reduces post-operative sensitivity

38
Q

retards ion migration into dentin resulting in less tooth
discoloration

39
Q

2 coats must be placed, thickness of 2-5 microns

40
Q

not applied to cavity walls when using silicates, silicophosphate, and glass ionomer cement

A

CONTRAINDICATIONS

41
Q

not applied to cavity walls when using filled or unfilled composites

A

CONTRAINDICATIONS

42
Q

T/ F
not applied to cavity walls when using filled or unfilled composites

43
Q

Varnish Prevents microleakage

44
Q

Liner Prevents microleakage

45
Q

Base Prevents microleakage

46
Q

Varnish

Thermal Insulation

47
Q

Liner

Thermal Insulation

48
Q

Base

Thermal Insulatio

49
Q

Varnish

Chemical Insulation

50
Q

Liner

Chemical Insulation

51
Q

Base

Chemical Insulation

52
Q

Compressive Strength of Varnish

53
Q

Compressive Strength of Liner

54
Q

Compressive Strength of Base

A

Zn Po4
GIC
Zn Polycarboxylate
ZOE

55
Q

T/F

CAVITY LINERS AND BASES Use only for cavity preparations to be filled with amalgam (regardless of the depth).

56
Q

Calcium hydroxide

A. Cavity liners
B. Cavity bases

57
Q

T/ F
CAVITY LINERS involves DIRECT PULP CAPPING and INDIRECT PULP CAPPING

58
Q

Put calcium hydroxide directly on the expose pulp. Observe
and hope that it will recover.

A. DIRECT PULP CAPPING
B. INDIRECT PULP CAPPING

59
Q

In case of accidental pulp exposure (accidentally hit it with
the bur), if the rest of the cavity is already clean and the
depth is less than 0.5mm, then you can do?

A. DIRECT PULP CAPPING
B. INDIRECT PULP CAPPING

60
Q

If a tooth has no history of pain or is asymptomatic, and you
can already see the pulp (pink spot) while excavating deep
caries, then you can do indirect pulp capping.

A. DIRECT PULP CAPPING
B. INDIRECT PULP CAPPING

61
Q

Put calcium hydroxide and a temporary restoration material.
Observe and hope that it will recover.

A. DIRECT PULP CAPPING
B. INDIRECT PULP CAPPING

62
Q

Apply in thicker consistency to supplement mechanical
support for the restoration by distributing local stresses from
the restoration across the underlined dentin surface.

A. Cavity liners
B. Cavity bases

63
Q

Only used as a sub base

A

CALCIUM HYDROXIDE

OPEDENT (9 decks)

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