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Operative III Summer 2018 (BLW) > Acid Etching for Enamel and Dentin Bonding > Flashcards

Acid Etching for Enamel and Dentin Bonding Flashcards

1
Q

Know compositions of Enamel and Dentin

  1. Mineral/Inorganic
  2. Organic
  3. Water
A

Enamel: 88-M, 2-O, 10-W

Dentin: 50-M, 25-O, 25-W

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2
Q

3 Jobs etching accomplishes

A
  1. Dissolves hydroxy apatite
  2. Removes smear layer
  3. Increases total surface energy
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3
Q

What is the % of phosphoric acid used for enamel etching?

A

30 - 40%

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4
Q

Does increasing the depth of demineralization increase bond strength?

A

NO! It will actually increase post-op sensitivity!

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5
Q

Degree or _______ varies enormously from acid to acid and from patient to patient

A

decalcification

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6
Q

TERM – used to improve estheritcs because it makes the visual transition from tooth to composite more gradual

Easier to hide finish lines if they are VERTICAL and HORIZONTAL rather than diagonal

A

Bevels

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7
Q

How long should you etch primary teeth?

A

60 - 120 seconds

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8
Q

Etching enamel for as little as _____ seconds produces the same bond strength as etching for longer

A

15 seconds

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9
Q

If you over etch dentin, bond strength will —?

A

DECREASE

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10
Q

Dentin is a ____ bonding to enamel?

A

Secondary

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11
Q

6 Steps of Bonding to Enamel

A
  1. Shade selection prior to RD isolation
  2. Place bevel and remove unsupported enamel
  3. Etch enamel
  4. Rinse and Dry
  5. Place enamel bonding resin (NO SCRUB)
  6. Place restorative composite
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12
Q

After enamel has been etched, saliva _______ the bond strength to enamel

A

DECREASES

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13
Q

How must you treat a contaminated etched tooth?

A

RE-ETCHING

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14
Q

Does GI require etching?

A

NO -Chemical bonding between:

  1. Polycarboxylic/ Phosphate monomers
  2. Hydroxyapatite
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15
Q

5 Steps for Bonding to Dentin

A
  1. Etch dentin for 15 seconds (NO MORE)
  2. Rinse and Dry (not overdrying)
  3. Place dentin/enamel bonding resin
  4. Scrub bonding resin (unlike enamel)
  5. Place restorative composite
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16
Q

True/ False

Water will contaminate etched enamel

A

False!

Saliva and Blood will contaminate etched enamel!

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17
Q

Properties of Dentin

  1. Contributes ___ % to the hardness of enamel
  2. _____ tensile strength and _____ modulus of elasticity than enamel
  3. ________ properties
  4. Stops the propagation of _______ in the enamel
A
  1. 20%
  2. higher tensile strength and lower modulus of elasticity
  3. isotropic properties
  4. most cracks
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18
Q

Is dentin uniformly mineralized?

A

NO

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19
Q

Which is more mineralized – peritubular or intertubular dentin?

A

Peritubular Dentin

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20
Q

Tubule density changes with _____?

A

location

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21
Q

Dentin relies on the penetration of adhesive monomers into ______ fibers

A

Collagen

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22
Q

In order to create microtags in enamel, you should etch with strong or weak acid?

A

STRONG

23
Q

You should etch dentin with a strong or weak acid?

A

WEAK

24
Q

The type of class # with the highest C factor =

A

Class I

25
Q

Is composite packable and condensable like amalgam?

A

NO

26
Q

TERM—

  1. Adheres to layer of tooth debris, saliva, and bacteria
  2. Covers surface and plugs tubules to reduce permeability
  3. Weak cohesion and adhesion (limits bond strengths)
A

SMEAR LAYER

27
Q

If dentin becomes dessicated, ____% of the bond strength is lost

A

50%

28
Q

How can you restore the bond strength if dentin is dessicated?

A

Rehydrate with water to open the collagen fibers prior to the next step of the restoration

29
Q

Does a composite resin fight against caries if leaking occurs?

A

NO

30
Q

Should a tooth be wet or dry when diagnosing caries?

A

DRY

31
Q

What allows for the composite restoration to able to add another layer or composite? (unless contaminated with blood or saliva)

A

Oxygen Inhibition Layer

32
Q

Is it necessary to redo the whole composite if you find a void with an explorer post curing?

A

NO- simply use bond and composite to patch the void

33
Q

Does self-etching primers remove the smear layer?

A

NO- there will be a hybrid and smear layer entanglement

34
Q

Does total etch remove the smear layer?

A

Yes! A hybrid layer entanglement will occur with resin adhesive

35
Q

The bonding agent will penetrate thru the __________ dentin and forms the hybrid layer (resin-dentin interdiffusion zone)

A

Intertubular Dentin

36
Q

Greater # of blades on a bur = smooth/rough cutting?

A

Smoother

37
Q

If a patient is at high risk for root caries, what restoration material should be considered?

A

Glass Ionomer

38
Q

When polishing a composite, you should begin with the ______ to ______ abrasive disks

A

Coarse to fine

39
Q

True or False?

Silicane is the nano filler particle

A

FALSE– fillers are glass particles

40
Q

Is using color the best indication for determining caries?

A

NO – arrested caries are darker than active caries; staining

41
Q

When polishing a composite with a rotary instrument, it is important to keep in mind that it results in….

1.

2.

A
  1. Heavy Force
  2. Heat Production
42
Q

What was the initial dentin bonding system like?

A

3 step system

  1. Strong acid
  2. Primer scrubbed into dentin
  3. Resin adhesive, thinned, and polymerized with light
43
Q

True or False

The 3 step dentin bonding system is technique sensitive

A

TRUE; however it is the GOLD STANDARD!

44
Q

Primers are solutions containing ______ monomers dissolved in a solvent such as acetone, ethanol or water.

A

Hydrophilic

45
Q

In order to simplify the 3 step dentin etching system… What 2 components were added together to create a 2 step system?

A
  1. Acidic Etch
  2. Primer and Bonding Agent
46
Q

What components are part of the optibond solo plus?

A
  1. Primer
  2. Bond

2-Step dentin etch technique (with use of acid etch first)

47
Q

How exactly does dessicating the dentin prevent the bonding integrity?

A
  1. Collagen bridges collapse
  2. Poor penetration of primer/bond
  3. Unhealthy hybrid layer
48
Q

Describe how to use the optibond solo plus

A
  1. Apply primer/bond
  2. Scrub for 15sec on all areas of tooth needing bonding
  3. Blow air to thin
  4. Repeat steps 1-3
  5. Light cure for 20 seconds
49
Q

What is the purpose of using 2 layers of primer/bond?

A
  1. Improve penetration
  2. Thicker hybrid layer
  3. Increases bonding agent coverage and strength
50
Q

Thoughts about One-Step Self-etch?

A

BAD

Several challenges with all 3 components were combined into one bottle.

51
Q

Dental Composite setting reaction is a ______-______-_______ setting reaction

A

Free-Radical-Initiating Setting Reaction

52
Q

The oxygen inhibition layer consists of many ______ monomers which allow for the continuation of added composite if needed.

A

Uncured (non-polymerized resin)

53
Q
A

Operative III Summer 2018 (BLW) (7 decks)

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