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Indirect Exam 2 > Polymer-Based Cements > Flashcards

Polymer-Based Cements Flashcards

1
Q

What do all polymer based cements not have?

A

water unless contamination occurred

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2
Q

Composition of zinc polycarboxylate cement:

A
  • liquid: copolymer of poly acrylic acid and itaconic acid
  • powder: zinc oxide and magnesium oxide
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3
Q

What type of reaction occurs with polycarboxylate cements?

A

chelation
- carboxylate groups chelate to calcium
- this one does bond to tooth structure (unlike zinc oxide that just chelates internally)

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4
Q

Which material is very acidic but doesn’t penetrate into tubules much due to size of molecule?

A
  • zinc polycarboxylate
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5
Q

Poly carboxylate is a ______ to glass ionomer.

A

forerunner

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6
Q

Composition of glass ionomer:

A
  • powder: aluminosilicate glass and fluoride flux
  • liquid:polyacrylic acid, itaconic acid, tartaric acid (setting modifier)
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7
Q

How you can use glass ionomer

A
  • linear/base
  • durable filler
  • cementing
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8
Q

Properties of glass ionomer:

A
  • strong (2x more than zinc phosphate)
  • anticariogenic
  • low solubility once set
  • adhesion (to tooth structure)
  • biocompatible (doesn’t go into dentin tubules)
  • technique sensitive
  • can be light cured
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9
Q

difference between adhesive and self adhesive resin cements:

A
  • adhesive resin cement: adhere to tooth structure but require separate etch and bonding agent
  • self-adhesive resin cement: adhere to tooth and other structures without separate etch and bond agent
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10
Q

What is a primer for?

A

it is a chemical agent used to increase the affinity of an adhesive to metallic or ceramic materials (inside the crown/restoration)

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11
Q

Two basic categories:

A
  • resin based cements
  • resin based glass ionomers
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12
Q

ideal properties for cement:

A
  • high bond strength to tooth structure and other materials
  • high tensile/compressive strengths
  • low solubility
  • colo stability
  • low water absorption
  • low film thickness
  • radiopacity
  • tolerance to moisture during cementation
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13
Q

disadvantages of resin based cements:

A
  • technique sensitive in that bond strength is affected by: pre tx procedures, depth of cure, degree of polymerization, opacity/shade of restoration and cement
  • difficult to clean up
  • change shade during curing
  • may darken during lifetime
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14
Q

Resin cements are classified via:

A
  • polymerization mechanism (light/chemical/dual)
  • adhesive scheme (adhesive vs self adhesive)
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14
Q

Why should you selectively etch even when you’re using self adhesive resin cement?

A

because it is less strong in that it relies solely on the acidity of the cement and does not acid etch enamel very well

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15
Q

Advantage of light cured resin cement:

A
  • increased working time
  • decreased finishing time so should remove excess cement before final curing
  • color stability
16
Q

When is dual cure resin cements indicated?

A

when ceramic is too thick or too opaque (white) or metallic crown

17
Q

What are the self and light cure imitators used in dual cure resin cements?

A
  • self cure initiator: benzoyl peroxide
  • light cure initator: camphorquinone
18
Q

What is tack cure?

A
  • after seating restoration, cure marginal excess for ~2 seconds
  • then, remove cured excess easily with scaler
  • this makes cleanup after full set much faster
19
Q

Downside of chemical/self cure resin cements:

A
  • not as color stable as light cured
  • limited shade selection
20
Q

Which resin cement has a universal bonding agent?

A

adhesive resin cements
(self-etch, total etch, selective etch)

21
Q

What does the universal bonding agent do in adhesive resin cements?

A

bonds cement to the tooth

22
Q

What does the optional phosphoric acid (30-40%) do?

A
  • etches enamel/dentin
  • removes smear layer and opens tubules
  • can be total or selective etch
23
Q

How is adhesive resin cement cured?

A

light or dual cured

24
Q

Which cement has the highest bond strength, especially to enamel?

A

adhesive resin cements (because it has a bonding agent)

25
Q

What is the one-component, “universal” adhesive?

A

self-adhesive resin cement

26
Q

Difference in bonding structures between adhesive and self adhesive resin cements?

A
  • adhesive: bonds cement to tooth
  • self-adhesive: bonds to enamel, dentin, metal and ceramic
27
Q

Properties of self-adhesive resin cements:

A
  • acidic monomer
  • better bond to dentin than enamel… this is why you want to separate acid etch enamel only if possible (but can adversely affect dentin bond)
28
Q

Self adhesive resin cement that is used in clinic:

A

RelyX Unicem 2 (3M ESPE)

29
Q

What is the molecule in self adhesive resin cements that allows bonding to different structures?

A

10-MDP

30
Q

Bond strength of cements:

A
  • self adhesive alone isn’t as strong as adhesive resin cements
  • etching of enamel by phosphoric acid when using self adhesive strengthen bond strength to enamel but lowered bond of dentin
  • resin modified glass ionomer typically 1/2-1/3 bond strength of resin cements
31
Q

In dual cure,

A

light cure accessible margins!!!

32
Q

How does the pH change in self adhesive resin cements?

A

acidic to neutral in 24 hours
- pH= 2 after mixing
- ability to self etch, hydrophilic for interaction with moist collagen fibers

  • pH= 7 after 24 hours
  • hydrophobic, resistant to water uptake, helping prevent staining and cracking, and adding to long term stability
33
Q

If you had a metallic restoration, which cement would you choose?

A
  • almost any cement not requiring light activation
  • dual cured possible
34
Q

If you had an all ceramic restoration, which cement would you choose?

A
  • one of the resin cements
  • RMGI second choice
35
Q

If you had a porcelain veneers, which cement would you choose?

A
  • light cured preferable to avoid possible color change
36
Q

Advantages of RMGI:

A
  • exhibit fluoride release comparable to true glass ionomer cements
  • moisture tolerance during cementation
  • adhere to tooth structure
  • less soluble than glass ionomers
37
Q

Disadvantages of RMGI:

A
  • potential expansion after setting due to water absorption (can cause crack propagation in all ceramic restoration)
  • preparation needs to be more retentive in design
38
Q
A

Indirect Exam 2 (7 decks)

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