Operative Flashcards

1
Q

Etching function

A

37% phosphoric acid
removes the smear layer, creates micro porosities, and widens dentinal tubules, all of which help create a micromechanical bond between the tooth and composite.

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2
Q

Opalescence

A

describes the effect of a translucent material appearing blue in reflected light and red-orange in transmitted light.

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3
Q

What’s buttjoint

A

90 degree

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4
Q

Composite shade 1-4 represents

A

1 = least chroma and highest value
4 = high chroma and low value

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5
Q

Cracked Tooth syndrome

A
  1. Mandibular second molars
  2. Mandibular first molars
  3. Maxillary premolars
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6
Q

Galvanism

A

of the amalgam refers to the generation of an electric shock due to the contact of the metal amalgam with another metal

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7
Q

What’s sandwich technique

A

the subgingival portion is restored with a glass ionomer cement, which creates a floor above the gingiva that can be isolated properly for a resin composite restoration.

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8
Q

What’s the role of CaOH2 liner

A

to rebuild dentinal bridge
- it is alklaine (12.5)

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9
Q

Does abfraction have caries?

A

they are non-carious cervical lesions caused by occlusal forces

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10
Q

How many phases of gamma in amalgam

A

3

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11
Q

gamma 1 phase

A

2nd phase
with the silver alloy. It is not as strong as the gamma phase, but it is still relatively strong and resistant to corrosion.

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12
Q

Gamma-2

A

the third phase of the reaction and is the result of mercury reacting with tin. This phase is quite weak and easily corrodes.

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13
Q

gamma

A

1st phase
the strongest phase is the gamma phase, which is the silver alloy. The gamma phase also has the least amount of corrosion.

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14
Q

type of margin type
1. gold
2. PFM
3. All ceramic

A

Gold:Knife-edge

Porcelain-fused metal (PFM); Deep chamfer

All-ceramic: Rounded shoulder

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15
Q

Tooth flexure causes?

A

abfraction or wedge shape cervical lesions. results from excessive occlusal forces

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16
Q

radiopacity of composite comes from what compoenent of resin

A

silica

17
Q

activator in self-cure composites

A

tertiary amine

18
Q

gamma 2 made of?

A

Mercury and tin

19
Q

Example of desensitizer and purpose

A

gluma: it seals dentinal tubules

20
Q

to increase setting time, use hot or cold water?

A

use hot water and less content

21
Q

which material is used for sandwich method of restoration

A

glass ionomer