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BOARDs > Operative: Composite & Glass Ionomer > Flashcards

Operative: Composite & Glass Ionomer Flashcards

1
Q

Enamel Bonding vs Dentin Bonding

A

Enamel Bonding
* Reliable
* Predictable
* Shear bond strength=20+ MPa
* Etching: Turns low surface energy surfaces to rough high surface energy surfaces w/Increased wetting

Dentin Bonding:
* Just as strong
* Not as reliable or predictable

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2
Q

Why is it hard to bond to dentin?

A

Composition:
* dentin has more organic and water (not affected by acid) & Less mineral

Structure:
* enamel rod’s= parallel
* Dentin: collagen=bowl of spaghetti

Depth:
* The Deeper you go= Larger & more number dentin Tubules= Decreased bond strength

Smear Layer:
* decreses dentin permeability

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3
Q

Etch

A

30-40% phosphoric acid
* 15 seconds
* Rinse w/water for 10 seconds

Removes smear layer
* Cleans surface debris

  • Etched Enamel: Chalky, creates microporosities
  • Etched Dentin: exposes collagen layer; widens dentin tubules
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4
Q

Primer:

A

HEMA: (Hydroxymethyl methacrylate)
* Amphipathic molecule: hydrophobic & hyrdrophillic end
* Monomer + Solvent
* allergic contact dermatitis
* Prevents collagen collapse

Solvent:
* Acetone, Ethanol, or water

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5
Q

Bond

A

Aka Adhesive

Bis-GMA
* MMA Bond: chemical bond to primer and composite resin

Hybrid Layer

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6
Q

Hybrid Layer

A

Mechanical interface b/w tooth and adhesive
* Micromechanical Bond=Key to great bond strength

resin tags:
* adhesive resins lock into the microporosities of etched enamel and intertubular dentin

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7
Q

Etch and Rinse Systems

A

Etch in own syringe

4th Gen: Gold Standard
* Etch
* Prime
* Bond

5th Gen:
* Etch
* Prime/Bond

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8
Q

Self Etch Systems

A

Less powerful etch
* Decreased Post-op sensitivity
* weaker bond= doesn’t completely remove smear layer
* Recommend: Carbide burs only-leave less smear layer

6th Gen:
* Etch/Primer
* Bond

7th Gen
* Etch/Prime/Bond

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9
Q

Composite Resins

A

Resin Matrix: Bis-GMA
* leach bisphenol A (BPA)–> wear of composite or uncured resin
* Negligible side effects

Filler Particles: Silica
* radiopaque
* affect composite properties

Coupling Agent: Silane
* adhesion b/w Filler & Resin

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10
Q

What are the different types of composite?

A

Macrofill
Microfill
Hybrid
NanoFill
Nanohybrid

Flowable
Packable

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11
Q

Larger Fillers vs Higher Filler content

A

Larger Fillers:
* more strength
* Don’t polish or wear (rougher) as well

Higher Filler Content= Less water absorption

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12
Q

Self Cure vs Light Cure Composite

A

Self Cure Composite: 2 paste system
Benzoyl peroxide=intiator
Tertiary Amine: activator

Light Cure Composite: 1 Paste System
* Camphorquinone=initiator
* 468 nm light initiates polymerization

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13
Q

Polymerization shrinkage

A

Composites shrinks 2-3% as they polymerize

C-Factor=Configuration factor
* =ratio of bound to unbound surfaces

GV Black class is inversely related to C factor
* The higher the class, the lower the C factor

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14
Q

What does a High C-Factor have a higher chance of?

A
  • shrinkage
  • microleakage
  • post-op sensitivity
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15
Q

Glass Ionomer

A

Acid base rxn
* Acid: Polyacrylic acid
* Base: FA glass

Retention: Chemical bond to tooth (Calcium Chelation)
* Self adhesive (no prime and bond)

Strength: weaker vs composite
* Fl release

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16
Q

Compare Glass Ionomer & Composite Resin

A

Glass Ionomer
* Acid: Polyacrylic acid
* Base: FA Glass
Retention: Chemical Bond (Calcium Chelation)
* Self Adhesive (no prime or bond)
Strength: Weaker vs composite:
* FL release

Composite Resin:
* Matrix: Bis-GMA
* Filler: Barium silicate glass
* Light cure or self cure
Retention: Micromechanical bond
Strength: Stronger vs GI
* No Fl release

17
Q

Resin-Modified Glass Ionomers (RMGI)

A

Sets by:
* acid-base rxn
* Free-radical addition polymerization (Light &/or chemical cure)

More rapid polymerization bc of free radical initiation
Releases FL
Stronger than Glass Ionomer

18
Q

Compomers

A

Aka: Polyacid-Modified Resin Composites

Anhydrous (Water free) Single pastes
* contains the major ingredients of Composite resin and Glass Ionomer
* EXCEPT WATER

Used in ortho
* slower polymerization (more time to clean up excess)
* Releases fluoride

19
Q

Ionomer-Modified Composites

A

Sets only by Polymerization

But contain ion-leachable glasses (=Fl release)

20
Q

Macrofill Composite

A

80% Filler
* particle size: 8 um

Very Strong
* Rough
* Increased Wear

21
Q

Microfill Composite

A

40% Filler
* Particle Size: .04 um

Weak
* Good polish
* Good Wear Resistance

22
Q

Hybrid Fill Composite

A

80% Filler
* particle size: 1 um

Best of both worlds: (Marco vs Micro)

23
Q

Nanofill Composite

A

Particle size: 0.005-0.01 um

Conglomerate to form spectrum of sizes

24
Q

Nanohybrid Composite

A

Most Popular (Ex: Filltrek)

Incorporates the conglomerate sizes of 0.05-0.01 um particles

25
Q

Flowable vs Packable Composite

A

Flowable:
* Very low filler amount
* Decreased wear resistance

Packable:
* High filler amount
* very viscous

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