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CAVITY LINERS AND BASES Flashcards

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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
ZINC PHOSPHATE CEMENT Liquid form
45-55% orthophosphoric acid
26
most irritating of all intermediary bases
ZINC PHOSPHATE CEMENT
27
used as a base and luting agent
ZINC PHOSPHATE CEMENT
28
acid is neutralized by dentin
ZINC PHOSPHATE CEMENT
29
highest compressive strength of ZINC PHOSPHATE CEMENT
12,000-17,000 PSI
30
POLYCARBOXYLATE CEMENT Powder form
zinc oxide with magnesium oxide + alumina
31
POLYCARBOXYLATE CEMENT Liquid form
40-50% polyacrylic acid
32
compressive strength: of POLYCARBOXYLATE CEMENT
7,000-9,000 PSI
33
irritant to pulp dentin organ
POLYCARBOXYLATE CEMENT
34
T/ F POLYCARBOXYLATE CEMENT effective thermal insulation in thickness of 1.5 mm
T
35
an organic copal or resin gum suspended in solutions of ether and chloroform
VARNISHES
36
used to line the cavity preparation for amalgam in order to improve the marginal and cavity wall seal
VARNISHES
37
under amalgam, reduces post-operative sensitivity
VARNISHES
38
retards ion migration into dentin resulting in less tooth discoloration
VARNISHES
39
2 coats must be placed, thickness of 2-5 microns
VARNISHES
40
not applied to cavity walls when using silicates, silicophosphate, and glass ionomer cement
CONTRAINDICATIONS
41
not applied to cavity walls when using filled or unfilled composites
CONTRAINDICATIONS
42
T/ F not applied to cavity walls when using filled or unfilled composites
T
43
Varnish Prevents microleakage
yes
44
Liner Prevents microleakage
No
45
Base Prevents microleakage
no
46
Varnish Thermal Insulation
No
47
Liner Thermal Insulation
No
48
Base Thermal Insulatio
yes
49
Varnish Chemical Insulation
yes
50
Liner Chemical Insulation
Yes
51
Base Chemical Insulation
yes
52
Compressive Strength of Varnish
No
53
Compressive Strength of Liner
No
54
Compressive Strength of Base
Zn Po4 GIC Zn Polycarboxylate ZOE
55
T/F CAVITY LINERS AND BASES Use only for cavity preparations to be filled with amalgam (regardless of the depth).
T
56
Calcium hydroxide A. Cavity liners B. Cavity bases
A
57
T/ F CAVITY LINERS involves DIRECT PULP CAPPING and INDIRECT PULP CAPPING
T
58
Put calcium hydroxide directly on the expose pulp. Observe and hope that it will recover. A. DIRECT PULP CAPPING B. INDIRECT PULP CAPPING
A
59
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
A
60
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
B
61
Put calcium hydroxide and a temporary restoration material. Observe and hope that it will recover. A. DIRECT PULP CAPPING B. INDIRECT PULP CAPPING
B
62
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
B
63
Only used as a sub base
CALCIUM HYDROXIDE

OPEDENT (9 decks)

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