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Dental Materials > Cements > Flashcards

Cements Flashcards

1
Q

What does HF acid do?

A
  • Creates micromechanical retention (creates an irregular, retentive surface)
  • Etch 20 seconds for EMAX, 60 seconds for Empress
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2
Q

Why do we use the two-component non-hydrolyzed silane coupling agent compared to the one component?

A

The one component prehydrolyzed is prone to degradation - needs to be refrigerated

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3
Q

How does a Silane Coupling Agent bond to ceramic?

A

It’s a bifunctional molecule…

  1. Covalent bond to silca in ceramic
  2. Covalent bond to methacrylate in resin via carbon double bonds via free radical polymerization
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4
Q

What has the highest shear bond strength (MPa) when comparing all the primers?

A

Bis-Silane

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5
Q

What’s a good product to use if you have saliva contamination?

A

Ivoclean

Use before silane coupling agent if there is saliva contamination

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6
Q

What does MDP bond to?

A

The phosphate group binds to minerals around collagen

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7
Q

What can strong air abrasion do to tetragonal zirconia?

A

Create a phase change in zirconia from tetragonal to monoclonic

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8
Q

What products contain MDP?

A

Cements: Panavia

Primers: Z-Prime

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9
Q

Can you name 2 Bifunctional Monomers?

A

MDP

4-META

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10
Q

What Ceramic Primer showed the most promisng Shear Bond Strength (MPa) to Zirconia?

A

Z-Prime Plus

(Contains Primarily MDP)

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11
Q

What chemical activator enhances a material to dual cure?

A

Aryl Sulphinic Acid

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12
Q

If you had to pick either “universal” or “non-simplified” as well as either “self-cure” or “dual-cure” to get the best bond strength to dentin with resin cements, which would you choose?

A

Non Simplified

Dual Cure

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13
Q

What are advanges of Resin Cements?

A
  • High tensile strength
  • High compressive strength
  • Bonds to tooth AND restoration
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14
Q

What are some disadvantages to Resin Cements?

A
  • Potential allergen
  • Pulpal sensitivity
  • Technique Sensitive (Hard to clean up!)
  • Cost
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15
Q

What is the composition of Resin Cements?

A
  • Cross-linking monomers (Bis GMA or urethane dimetharcrylate resin)
  • Functional monomers (MDP, 4-META)
  • Inorganic Fillers (silica, barium glass, ytterbium trifluoride)
  • Initiators, Activators, Inhibitors, Pigments
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16
Q

What are 3 different polymerization mechanisms?

A
  1. Self Cure
  2. Light Cure
  3. Dual Cure
17
Q

What are 3 different surface treatments for Resin Cements?

A
  1. Etch and rinse
  2. Self etch
  3. Self adhesive
18
Q

What are 3 different types of monomers in regards to resin cements?

A
  1. Esthetic (Pure Bis GMA)
  2. Adhesive
  3. Self Adhesive
19
Q

Describe the Self Cure mechanism…

A
  • Does not react with a light
  • MIx separate pastes (benzoyl peroxide initiator/tertiary armind activator)
  • Free radicals produced
  • Radicals attack carbon double bond of monomer
20
Q

What is an application for Self-Cure Cements?

A
  • Useful where light can not penetrate (resin-bonded FDPs - metal present)
  • Fast, strong set
  • Air-inhibited
  • Excess cement difficult to remove
21
Q

Describe the Light Cure mechanism…

A
  • Photo-initiator in resin (camphorquinone)
  • Abosrbs photon energy
  • Combines with activator (amine)
  • Creating free radicals
  • Initiates Polymerization (monomers and Bis-GMA)
22
Q

What are some advantages to Light Cure?

A
  • Longer working time
  • Greater Polymerization
  • Greater color stability
23
Q

What is a disadvantage for Light Cure cements?

A

Light attenuation through restoration

Attenuation in fiber optics, also known as transmission loss, is the reduction in intensity of the light beam (or signal) with respect to distance travelled through a transmission medium

24
Q

What is a clinical example of using a Light Cure Only Cement?

A
  • Light must reach cement (ceramic veneers)
  • Multiple Shades
25
Q

Describe Dual Cure Cements…

A
  • Both reactant types: light cure and self cure
  • Polymerize with/without light: ceramic inlays, onlays, crowns, FDPs, posts
  • Less polymerization if not completely light cured
26
Q

Is NX3 an example of a dual cure cement?

A

Yes!

It is light and dual cure

27
Q

Describe the machanism of action for Self Cure…

A
  1. Peroxide Initiator
  2. Aromatic TERTIARY AMINE activator
  3. May oxidize - color shift
28
Q

What are some advantages of Esthetic Resin Cements like NX3?

A
  • Multiple Shades Available
  • STRONGER MECHANICAL PROPERATIES THAN SELF-ADHESIVE RESIN CEMENT (RELY X UNICEM)
  • Light cured and dual cured
  • Requires seperate primer (MDP or silane)
  • Requires bonding agent (bonding to tooth substrates)
  • Cross-linking monomers only
29
Q

Describe the Light-Cure mechanism…

A
  1. CQ initiator
  2. Aliphatic Amine Activator
30
Q

What kind of cement is RelyX Unicem?

A

RMGI - Self-Adhesive Resin Cements

Great for metal restorations!

31
Q

What kind of cement is Ketac Cem?

A

Ketac cement by 3M is a permanent glass ionomer luting cement that offers fluoride release - it is considered a self-adhesive resin cement

Indicated for Metal/Glass Free Restorations!

32
Q

Describe some characteristics of Adhesive Resin Cements…

A
  • Stronger mechanical properties than self adhesive resin cement (Ketac Cem, Rely X Unicem)
  • Can bond directly to Zirconia or base-metals using MDP as a functional monomer
  • Requires seperate silane for glass-ceramic restorations
  • Requires bonding to tooth structure
  • Contains acidic and crosslinking monomers
33
Q

What are some properties of Self-Adhesive Resin Cements?`

A
  • Contains acid monomers
  • Self Etching - no bonding agent - MDP bonds directly to mineral content of dentin
  • Requires seperate silane (for glass ceramic restorations)
  • Can bond directly to Zirconia and Base Metals
  • WEAKER MECHANICAL PROPERTIES RELATIVE TO ESTEHTIC OR ADHESIVE RESIN CEMENTS
  • Dual Cured
  • Limited Shade Selection`
34
Q

When discussing Adhesive Resin Cement, Esthetic Resin Cements, and Self Adhesive Resin Cements, Which 2 have the higher flexural strength?

A

Adhesive and Esthetic Resin Cements

35
Q

When comparing Adhesive, Esthetic, and Self Adhesive cements, which 2 have the higher compressive strength?

A

Adhesive and Resin Cements

36
Q
A
37
Q

What have clinical studies found about self-adhesive resin cements?

A

Lower sensitivity for post cementation,

Dental Materials (9 decks)

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