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Operative 3 Final > Final > Flashcards

Final Flashcards

1
Q

Color category of the dentinal body

A

Hue

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2
Q

Color saturation of the dentinal body

A

Chroma

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3
Q

The degree of whiteness of enamel

A

Value

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4
Q

White spots of different types and shapes

A

Intensives

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5
Q

Blue or gray transparent effects found in enamel

A

Opalescence

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6
Q

Do teeth become lighter or darker when dehydrated?

A

Lighter

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7
Q

How long does it take for baseline shade to return after teeth have been dehydrated?

A

30 minutes

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8
Q

What could be the controlling factor in the overall acceptance of a restoration by the patient

A

Color

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9
Q

What features does dentin provide?

A

Color (primarily), opacity, lobes, and fluorescence

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10
Q

What features does enamel provide?

A

Modification to dentin color, shape, and surface texture

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11
Q

The higher the opacity of the material, the ___ it will mask the underlying color

A

More

More opaque - more it will mask oral cavity darkness - more it will reflect light - Hollywood smile

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12
Q

The thinner the material, the less ___ it becomes

A

Opaque

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13
Q

The lingual shelf is a thin layer of ___ ___ ___

A

Semi translucent enamel

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14
Q

The dentin layer is the most ___ layer

A

Opaque

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15
Q

What effect is seen at the incisal third?

A

Translucent effect

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16
Q

Optical properties of some resin composites are affected with ___ and ___ ___

A

Time and water uptake

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17
Q

The interaction between ___ and ___ gives the color of the tooth

A

Enamel and dentin

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18
Q

The perceived tooth color is a combination of complex optical phenomena that occurs when…

A

Light hits the tooth

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19
Q

The higher the ____, the brighter the color

A

Value

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20
Q

What is the ideal height:width ratio (%) for centrals

A

80%

21
Q

How do composite materials bond to enamel?

A

Micromechanical retention through resin micro-tags (resin that fills the micro-porosities created by the acid etch and then polymerized)

22
Q

Does enamel require macro-mechanical retention?

A

No

23
Q

Name the % makeup of enamel

A

88% mineral, 10% water, 2% organic

24
Q

Name the % makeup of dentin

A

50% mineral, 25% water, 25% organic

25
Q

What does etching do? (3)

A

Dissolves hydroxyapatite, removes smear layer, increases total surface energy

26
Q

What do we etch with?

A

37% phosphoric acid

27
Q

Does acid etching increase bond strength in dentin

A

No.

28
Q

How long do you etch on a permanent tooth? A primary? What might cause the difference?

A

15 seconds for permanent
60-120 seconds for primary

The primary enamel is amorphous and does not easily form the deep resin tags seen in permanent teeth

29
Q

How long do you rinse after etching?

A

10 seconds (longer if using gel etchant)

30
Q

What is the primary retentive feature when restoring with composite?

A

Bevels

31
Q

What is the point of a bevel?

A

Increases the enamel surface area to provide a better marginal seal and reduce marginal stains. Also increased esthetics to to more gradual transition between tooth and restoration

32
Q

Procedure of bonding to enamel

A
  1. Select shade and dam
  2. Place bevel and remove unsupported enamel
  3. Etch
  4. Rinse/Dry
  5. Bonding resin (no scrubbing)
  6. Composite
33
Q

What must happen if the etched enamel is contaminated

A

Must re-etch. Saliva and sulcular fluid decrease bond strengths

34
Q

What does dentin adhesion primarily rely on?

A

The penetration of adhesive monomers into the network of collagen fibers left exposed by acid etching (micromechanical retention)

35
Q

Procedure for bonding dentin

A
  1. Etch (15 s)
  2. Rinse/Dry
  3. Place bonding resin (must scrub, unlike enamel)
  4. Composite
36
Q

Dentin has ___ tensile strength and ___ modulus of elasticity than enamel

A

Higher

Lower

37
Q

______ dentin is more mineralized than _____ dentin

A

Peritubular

Intertubular

38
Q

What is the smear layer?

A

Adherent layer of tooth debris, saliva, and bacteria that covers surface and plugs tubules to reduce dentin permeability. It limits bond strength

39
Q

What happens when you dessicate dentin?

A

Collagen fibrils collapse which decreases bond strength by 50%

40
Q

What is the goal of all dentin bonding systems

A

Allow the bonding agent to penetrate the intertubular dentin, forming the hybrid layer (resin-dentin-interdiffusion zone)

41
Q

Explain a three-step etch system

A
  1. Strong acid (37% phosphoric) for 20 seconds (enamel) and 15 seconds (dentin) - then rinse
  2. Primer - scrubbed onto dentin
  3. Resin adhesive (dried and polymerized with light)
42
Q

Why is priming necessary?

A

To maintain an expanded collagen network while removing residual water to allow for the infiltration of the hydrophobic adhesive monomer

43
Q

Explain a two-step etch system

A
  1. Primer and bonding agent combined into one bottle
  2. Acid etch remains separate

We use OptiBond Solo Plus

44
Q

What is the procedure when using Optibond 2-step etch system

A
  1. Rub bonding agent for 15 seconds
  2. Gently blow air to thin
  3. Rub bonding agent again for 15 seconds
  4. Gently blow air again to thin
  5. Light cure for 20 seconds
45
Q

Why do you rub the bonding agent?

A

Improves penetration and produces a thicker hybrid layer

46
Q

What does the air inhibited layer consist of?

A

Mainly uncured monomers

47
Q

____ etch removes the smear layer and causes more post-op sensitivity while ___ etch does not.

A

Total

Self

48
Q

What is the role of primer

A

Increase surface tension of dentin

Operative 3 Final (1 decks)

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