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Tim's Cards > Dental Materials Part II, Test I > Flashcards

Dental Materials Part II, Test I Flashcards

1
Q

Class I cavities include what?

5 points here

A

All pit and fissure cavities

Occlusal Surfaces

Premolars/Molars

Occlusal 2/3 of Facial/LIngual surfaces

LIngual Max Incisors

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2
Q

Define Class II cavities

A

Proximal surfaces

Premolars/Molars

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3
Q

Class III cavities:

A

Proximal surfaces

Incisors/Canines

Do NOT involve incisal angle

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4
Q

Class IV cavities:

A

Proximal surfaces

Incisors/Canines

Involve Incisal angle

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5
Q

Class V cavities:

A

Gingival 1/3

Facial/Lingual

All teeth

*non pit/fissure cavities

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6
Q

Class VI cavities:

A

Incisal edge Anterior teeth

Occlusal cusp heights Posterior teeth

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7
Q

In enamel bonding, what 2 structures are identifiable after etching with phosphoric acid gel?

A

Microtags

Macrotags

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8
Q

What are the 3 procedures of Dentin Bonding?

A

Etching

Priming

Bonding

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9
Q

What % of Dentin is water?

A

25%

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10
Q

What are 4 functions of Etching in Dentin Bonding?

removes 2 things, exposes 2 things

A

Removes the smear layer

Removes HA from outer dentin layer

Exposes a collagen sponge layer

Exposes dentin tubules

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11
Q

During the Etching process, what must be done to keep the collagen sponge layer from collapsing?

A

Prevent drying

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12
Q

In Dentin Bonding, the resin component part of the primer’s attachment to the dentin is called what?

A

Hybrid Layer Formation

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13
Q

4 principles of adhesion in Dentin Bonding:

A

Hybrid Layer variable thickness

Mechanically weak if incomplete adherence with primer

Primer Solvents enhance wetting (monomers > tags)

To get monomers deep, many primer layers may be needed (as solvent evaporates)

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14
Q

What are the 2 parts of Primer that make it a Bifunctional Monomer?

A

Hydrophilic collagen

Hydrophobic resin

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15
Q

What is an example of a Bifunctional monomer?

A

HEMA

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16
Q

The self-etch two-step process has combined what?

A

Conditioner and Primer

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17
Q

Most bonding is a result of ________ retention

A

Micro-mechanical

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18
Q

Currently the best bonding takes place on a _____ surface and agents containing ______ and ______.

A

Moist

MDP and Ethanol

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19
Q

What are the 4 Major Components of Resin Composite restorative material?

A

Organic polymer matrix

Inorganic filler particles

Coupling agent

Initiator-accelerator system

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20
Q

The Organic Polymer Matrix that make up resin composite are made up of what?

A

Oligomers

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21
Q

What are 3 examples of Oligomers?

A

Bis-GMA

U-DMA

TEG-DMA

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22
Q

What is the most common photoinitiator in Visible-Light Activation?

What wavelength does it absorb?

A

Camphorquinone

Blue light (400-500 nm)

*reacts w/ activator, forms free radicals, polymerization

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23
Q

T/F

The surface layer of resin composite’s exposure to air may inhibit double bonds

A

True

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24
Q

What percentage of resin composite may be unreacted double bonds at the air contact surface layer?

A

75%

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25
What is present in bond failure interface in resin composite?
Microgap formation
26
In resin composite, what is Polymerization Shrinkage a direct function of?
Volume Fraction of Polymer
27
Because Microfilled composite has a higher volume percentage of polymer, there is more/less shrinkage?
More
28
Why does Microhybrid composite have less shrinkage?
Less polymer matrix
29
Thermally speaking, why does Microfilled resin composite have More Expansion?
More polymer present
30
Compared to highly filled Fine Particle Composites, what is the E value of Microfilled composites?
1/4 to 1/2 E value *microfilled not as good as highly filled fine particle
31
How is Irradiance (radiate exitance) measured?
photos per second per unit area mW/cm2
32
How is Energy Density measured?
Irradiance x time J/cm2
33
What is the most common photo-absorbing material?
Camphorquinone
34
What is the maximum spectrum sensitivity of Camphorquinone?
465-47- nm Blue range
35
What are 5 factors that determine how long it takes to adequately cure a composite?
Energy Density (irradiance of light x time) Distance from composite Collimation of light (focusing/narrowing) Wavelengths emitted and absorbed Composite type
36
What is the Reciprocity principle in terms of Total Energy Density?
Increase irradiance, Decrease time Decrease irradiance, Increase time
37
What 2 types of light will lower irradiance and therefore increase curing time?
LED Halogen
38
What type of light will increase irradiance and therefore decrease curing time?
Plasma arc
39
Other than lowering Irradiance, name 5 factors that will Increase curing time
Microfil composites Darker shades Flowable composites greater distance poor collimation
40
Other than increasing irradiance with plasma arc, name 4 factors that will Decrease curing time
Hybrid composites Lighter shades Close distance Good collimation
41
What instrument part fits into the handpiece and provides the rotary motion to the bur?
Shank
42
What connects the head to the shank?
Neck *usually tapers
43
What is the working part of the instrument?
Head
44
How are Rotary Cutting Instruments classified? | 2
Shape Number (which I think is size)
45
If the rake face is ahead of the radius, the bur has a ....
Negative Angle
46
A negative rake angle is used for cutting hard brittle materials because it...
Minimizes fracture of the cutting edge
47
Increasing the Clearance Angle ________
Decreases the Edge Angle
48
What provides space for the chips formed ahead of the following blade?
Clearance Angle
49
Why are Carbide burs at around 90 degrees and need more of a rake angle? This angle is considered?
Carbide is brittle Negative
50
T/F Clearance angles are either curved or have 2 surfaces to provide low clearance angles and greater clearance space ahead of the following blade.
True
51
What does a Coupling Agent ensure?
Bond forms between Inorganic filler and Oligomer during setting
52
What is an example of a Coupling Agent?
Silane
53
T/F | Coupling Agent like Silane is applied to the surface of the filler before it is mixed with Oligomer
True
54
When the Oligomer sets, the double bonds from the Silane react with the Oligomer to bridge a link between what?
Filler > Coupling Agent > Oligomer > polymer matrix
55
Compared to a Microhybrid, a Microfil will have more Matrix Resin in it. What are 5 consequences for Microfil?
Take up more water More soluble in mouth More polymerization shrinkage Higher rate of Thermal Expansion Lower Elastic Modulus ***overall, decreased properties
56
Where would Microfils most likely be used? Where would Microhybrids most likely be used? *one Doesn't go into heavy load-bearing areas
Aesthetics Load bearing ***Microfils shouldn't be used on load bearing interface - will stress tooth-composite bond because of "squishyness"
57
Round burs are measured from ____ to _____ Pear shaped bur common measurement: Tapered fissure burs common measurement:
1/4 to 8 330, 329 (230-232) 169 (700-703)
58
What happens to the edge angle if you increase the clearance angle?
Edge angle decreases
59
What happens when we etch dentin? What happens when we etch enamel?
Prevent drying, hybrid layer, collagen Microtags/Macrotags
60
What are the 4 components common to all bonding?
Etching Primer Adhesive Initiator
61
How is the Hybrid layer formed?
Resin in Primer > Etched Dentin
62
Look at HEMA molecule
OK hydrophobic/hydrophilic
63
Polymerization of composites:
Initiation, Propagation, Termination
64
T/F | Microhybrids are blends of fine materials
True

Tim's Cards (140 decks)

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