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_Patient Care II > 3/11: Types of Cement and Their Uses > Flashcards

3/11: Types of Cement and Their Uses Flashcards

1
Q

What are types of cements?

A

Zinc phosphate
Zinc oxide eugenol
Zinc polycarboxylate
Glass ionomer
Resin-modified glass ionomer
Provisional cements

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2
Q

Note that no cement will perform to it’s optimal level clinically without an ______________________ that includes good resistance and retention form

A

Adequate preparation

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3
Q

What are characteristics of cements?

A

Biocompatibility
Retention
Mechanical properties - withstand occlusal forces, high tensile strength
Marginal seal
Low film thickness
Ease of use
Radiopacity
Esthetics

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4
Q

What is the first cement appearing in dental literature?

A

Zinc phosphate

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5
Q

What cement is the standard which other cements are assessed?

A

“gold standard”
Zinc phosphate

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6
Q

What are advantages of zinc phosphate?

A

Thin film thickness and proven reliability
Low solubility which resists breakdown in the mouth
Low thermo-conductivity - provide less sensitivity to hot and cold
Long shelf life

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7
Q

What are disadvantages of zinc phosphate?

A

Initial low pH- can lead to pulpal irritation
No chemical adhesion/bond
No antibacterial properties
Poor esthetics (for all porcelain)
Long setting time: 2.5-8 minutes
Exothermic - chill glass slab when mixing, small amounts of powder added to liquid

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8
Q

What are two types of Zinc oxide eugenol (ZOE) cement?

A

Type I
Type II

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9
Q

How do the two types of ZOE differ?

A

In their properties and uses

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10
Q

Describe type I ZOE

A

Less strong and used for temporary restorations and for temporary cementation (temp-bond)

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11
Q

Describe type II ZOE

A

Reinforced and stronger
Last for 6-12months in the mouth
Used for a tooth that cannot ber estored immediately (IRM)

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12
Q

What cement is referred to as an intermediate restoratie?

A

Type II ZOE

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13
Q

What is the benefit of ZOE?

A

Neutral pH
Has a sedative or soothing effect on the dental pulp
!A protective or insulating base or liner is not required

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14
Q

When is ZOE not used?

A

Under composite or acrylic restorations because eugenol is incompatible with these materials and retards their setting process

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15
Q

What determined whether the powder is incorporated into the liquid in increments or all at once?

A

The type adn intended use

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16
Q

What is the mixing/setting time of ZOE?

A

Mixing: Usually 30-60 sec
Setting: 3-5 min

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17
Q

When and why was zinc polycarboxylate developed?

A

1968 - to circumvent pulpal problems associated with low pH

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18
Q

What was the first cementing system to obtain an adhesive agent that bonded to enamel and dentin?

A

zinc polycarboxylate

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19
Q

What kind of action does zinc polycarboxylate have?

A

Antibacterial

20
Q

Describe the working/mixing time of zinc polycarboxylate

A

Mixing- 30-40 sec
Working- 2.5min

21
Q

What powder is incorporated in large quantities?

A

polycarboxylate

22
Q

What cement isn’t as fragile as zinc phosphate?

A

polycarboxylate

23
Q

What poor characteristic does polycarboxylate have?

A

Poor marginal sesaling due to film thickness
- rubbery

24
Q

What doesn’t the polycarboxylate support?

A

Occlusal stress as well as newer cement
- sometimes use it in temporary circumstances

25
Q

What does/does not polycarboxylate bind to?

A

Most alloys but NOT gold

26
Q

Is polycarboxylate difficult to remove excess?

A

Yes (Rubbery)

27
Q

What cement bonds well to enamel/dentin but it’s use has lessened over the years?

A

polycarboxylate
- can be used as permanent, but there are better ones out there. It’s used as a long term temporary cement or a short term clinical crown

28
Q

What is glass ionomer cement known as?

A

Acid-base cement

29
Q

What is part of the success of glass ionomer cement?

A

Their performance is good even if they have not been properly mixed

30
Q

What is the film thickness of glass ionomer cement?

A

Very thin film thickness

31
Q

What cement is extremely moisture tolerant but fairly soluable?

A

Glass ionomer

32
Q

What is an important advantage of glass ionomer cement?

A

Fluoride release
It can be sustained for long periods of time

33
Q

What can affect film thickness?

A

Working time
- longer working times allow more flow and will aid in seating the restoration

34
Q

It’s important that mixing and placement of the cement is completed within ________ minutes

A

2-2.5

35
Q

When and why were modified glass ionomers created?

A

Early 1990s to overcome the high solubility of glass ionomers

36
Q

What do modified glass ionomers have added?

A

Hydrophillic methyacrylate monomers

37
Q

What are the benefits/advantages of glass ionomers?

A

Same benefits of glass ionomer cements

38
Q

What are disadvantages of modified glass ionomers?

A

Low early strength and moisture sensitivity during setting

39
Q

How long does it take for modified glass ionomers to set?

A

24 hours for the final set

40
Q

What is the key role of provisional/temporary cements?

A

Keeping the temporary restoration on the tooth while the patient is waiting for the final restoration to return from he lab

41
Q

What cement needs to be easily removed from prepared tooth without harming periodontum, tooth preparation, or pulp?

A

Provisional/temporary

42
Q

Most provisional/temproary crowns have?

A

Eugenol (ZOE)
- although eugenol can have a negative effect on acrylic resins and composite resin cements

43
Q

What affect does eugenol provide for temporary cements?

A

Antibacterial effect

44
Q

What are examples of temporary cements?

A

Temp-bond
Ultra temp
Relyx temp

45
Q

What should you consider when selecting temporary cements?

A

How long
How retentive
What will permanent cement be
Working in esthetic zone

_Patient Care II (10 decks)

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