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DM Theory > Dental Cements Ch14 (W11) > Flashcards

Dental Cements Ch14 (W11) Flashcards

1
Q

What is a thin layer of resinous material placed on the floor and walls of prep to seal tubules and minimize micro-leakage

A

Cavity varnish

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2
Q

What is the purpose of a liner

A

Thin layer of material placed to protect the pulp

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3
Q

What is a thick layer of cement used to protect the pulp from chemical and thermal irritation

A

Base

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4
Q

What does luting refer to

A

Cementing two components togetehr

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5
Q

In dentistry when the cement is set how does it appear

A

Hard and brittle

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6
Q

Type I cements are

A

Luting agents

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7
Q

What would you use a type I cement for? (Luting agent)

A

Glue crowns, bridges, onlays& inlays
Cement or bond ortho band/bracket
*can be perm or provisional

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8
Q

Type II cements are used for

A

Provisional/intermediate restorations or long term

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9
Q

Type II cements may include

A

Glass ionomer cements
Dental sealants

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10
Q

Type III cements are

A

Bases or liners for cavity preps

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11
Q

Strength of a cement is controlled by amount of

A

Powder incorporated

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12
Q

The strongest dental cements are

A

Resin cements

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13
Q

The weakest dental cement is

A

Zinc oxide eugenol

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14
Q

Cements are ____ materials with good ____ strengths

A

Brittle; compressive

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15
Q

Resin containing cements are

A

Insoluble cements

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16
Q

Retention is accomplished by

A

Adhesion

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17
Q

What are two types of adhesion

A

Mechanical
Chemical

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18
Q

Interlocking of one material with another is what kind of adhesion

A

Mechanical

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19
Q

At molecular level- ionic bonding or covalent bonding describes what kind of adhesion

A

Chemical

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20
Q

In many dental applications, chemical and mechanical adhesion occurs

A

Together

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21
Q

Adhesive agent will decrease? It aids in ?

A

Decrease microleakage
Aids in retention

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22
Q

What are factors that may weaken the strength of adhesion between two materials

A

Coefficient of thermal expansion
Dimensional changes
Contamination

23
Q

Material with low viscosity =

A

Luting agent

24
Q

Luring cements help prevent microleakage by sealing the interface between the

A

Tooth and the restoration

25
Q

Luring cements are classified according to their composition; what are the 3

A

Water based
Resin based
Oil based

26
Q

Water based: zinc phosphate disadvantages

A

Pulp irritation
Weaker than other cements
Highly soluble (will wear away/wash away in time)

27
Q

Water based: zinc carboxylate advantages

A

Adheres to tooth structures
Non irritating to pulp
Inexpensive

28
Q

Disadvantages of zinc carboxylate

A

Higher solubility
Short working time
Lower strength

29
Q

Water based: glass ionomer cement advantages

A

Chemical adhesion to tooth and metal
FLUORIDE RELEASE
Easy to mix
Moderate strength

30
Q

Water based: glass ionomer cement disadvantages

A

Postoperative sensitivity
Does not bond to glazed porcelain
Marginal solubility

31
Q

Resin based luting cements help increase retention of crowns or teeth with less than ideal preps. What are the 4 groups? (Insoluble)

A

Esthetic resin cements
Adhesive resin cements
Self adhesive resin cements
Provisional resin cements

32
Q

Oil based luting cements: ZOE. What is it used for

A

Provisional cementation
Provisional and intermediate restos
Low strength bases
Root canal sealers
Perio dressing

33
Q

ZOE should NOT be used when because it may inhibit the set of the resin

A

Under composite restos or as provisional cement before final cementation with resin modified glass ionomer or resin cements.

34
Q

What causes pulpal irritation

A

Bacteria effect of caries
Biologic response to chemicals in dental materials
Cutting off tooth structure

35
Q

What can be used to act as protective layers between the dentin and the restorative material

A

Cavity varnishes
Liners
Bases

36
Q

Cavity varnish is applied in 2 or 3 thin layers where in the prep?

A

Floor and walls

37
Q

Cavity varnishes are used under what restos? What are they not used under?

A

Used under amalgam restos
NOT used under composite resins

38
Q

What does a protective base do

A

Protects the pulp before the resto is placed

39
Q

What does an insulating base do

A

Protects the tooth from thermal shock

40
Q

What does a sedative base do

A

Soothes the pulp that has been damaged by decay or irritated by mechanical means

41
Q

Low strength base is aka

A

A liner

42
Q

Examples of low strength base (aka liner)

A

Calcium hydroxide (dycal)
Class ionomer
Zinc oxide eugenol (has sedative effect)

43
Q

What does a low strength base aka liner do?

A

-Provides minimal strength to support forces of condensation
-stimulates growth of secondary dentin
-provides a barrier btwn pulp & resto
-used as a direct pulp capping agent

44
Q

High strength base is aka

A

Base

45
Q

What does a high strength base aka base do

A

-Provides thermal insulation & support for resto

46
Q

A base is placed in areas where there is less than

A

2mm of remaining dentin over the pulp

47
Q

What thickness is a base placed in

A

0.5mm or greater

48
Q

Examples of bases

A

Reinforced ZOE
Zinc phosphate
Zinc polycarboxylate
Glass ionomer

49
Q

What is the purpose of surgical dressings

A

Provide protection and support for the surgical site
Patient comfort
Helps control bleeding

50
Q

What consistency are provisional and intermediate restorations mixed to

A

Secondary consistency

51
Q

ZOE should not be used as a base or provisional cement if

A

Composite resin or resin bonding agents are used

52
Q

Glass ionomer cements release what? Therefore what effect do they have

A

Release fluoride
Have anti cariogenic effect

53
Q

Do Products that do not release fluoride, only contain fluoride have antiocariogenic effects?

A

No

DM Theory (10 decks)

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