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RESTO > Resto > Flashcards

Resto Flashcards

1
Q

Remember***

<6% copper

A

Low copper amalgam

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2
Q

> 9%-30% copper
can almost completely eliminate the gamma 2 phase
no need to polish

A

High copper amalgam

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3
Q

Important Properties of Amalgam

A
  1. Dimensional Change
  2. Creep
  3. Tarnish & Corrosion
  4. Trituration
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4
Q

contraction or expansion of a material

A

Dimensional change

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5
Q

Increase expansiom of amalgam is related to

A
  1. Increase mercury
  2. Short trituration time
  3. Decrease condensation pressure
  4. Increase particle size
  5. Moisture contamination
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6
Q

gradual , time dependent dimensional change due to constant stress

A

Creep

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7
Q

chemical rxn between amalgam & local environment

A

Tarnish & Corrosion

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8
Q

formation of oxides

atoms disintegrates resulting to weakening of the metal

A

Corrosion

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9
Q

thin layer of corrosion at the top of the restoration . loss of luster of the amalgam

A

Tarnish

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10
Q

Corrosion byproduct of amalgam has what adv.

A

Tin sulfide

it improves the sealing properties of the amalgam to prevent secondary caries

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11
Q

dull, rough & grainy surface

low strength

A

Undertriturated

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12
Q

shiny
wet
homogenous
optimal strength

A

Properly triturated

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13
Q

wet sticky appearance

moderate strength

A

Overtriturated

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14
Q

Which do your prefer over or under triturated?

A

Overtriturated

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15
Q

What is the procedure in which the amalgam is rubbed using the first finger & thumb

A

Mullimg

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16
Q

Most common cause of amalgam chipping during carving

A

Carving after time has elapsed

17
Q

when there is ditching of amalgam restoration when it is indicated for replacement

A

0.5mm depth of ditch to make it more homogenous mixture

18
Q

Proper way of carving the amalgam

A

Resting sharp instrument on the cusp while carving

19
Q

Distance of margin of M& D wall to proximal surface must not be less tham

A

Premolars: 1.6mm
Molars: 2mm

20
Q

Marginal ridge of restoration must be of the

A

Same Level of Adjacent Tooth

21
Q

Most diff. tooth to adapt a matrix band

A

Max. 1st PM mesial due to developmental depression

22
Q

Why is matrix band extended occlusally when restoring class II cavities

A

Overfilling

23
Q

Diff. Type of Wedge

A
  1. Single Wedge
  2. Double Wedge
  3. Wedge Wedging
  4. Piggyback
24
Q

gingival recession

A

Piggyback wedging

25
Q

Hand Instruments Classification

A

Classification
Cutting
Non- cutting

26
Q

Basic Parts

A

Handle
Shank
Working end

27
Q

4 unit formula

A

Width
Angle cutting
Length
Angle degrees

28
Q

3 unit formula

A

WLA
Width
Length
Angle

29
Q

omitted in 3 unit formula because in this formula the cutting edge angle is immediately 90* or perpendicular to the blade

A

Cutting Edge Angle

RESTO (6 decks)

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