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Tip > Amalgam > Flashcards

Amalgam Flashcards

1
Q

What’s the cavosurface angle of an amalgam

A

70-75 degrees

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2
Q

Name retention methods of an amalgam

A

Slots , grooves , adhesion and amalgam pins

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3
Q

Why are dentine pins not used any more (5)

A
  • Increased risk of pulpal or periodontal perforations
  • Increases risk of crazing and cracking- (often the pin is wider than the pin channel causing fine cracks)
  • Amalgam pins can create the same resistance retention form
  • Need to ensure at least 2mm of amalgam to cover the pin
  • Dentine pins weaken the amalgam
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4
Q

What are the dimensions of an amalgam pin

A

2mm down 0.5-1mm wide
Placed in the middle of the lost cusp
1mm in from adj

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5
Q

What are the dimensions of an amalgam slot

A

1mm down 2mm wide

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6
Q

When should pins be placed

A

When cusps are lost (1pin per cusp )

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7
Q

Why should you aneal a matrix band

A

Removes elastic memory creates more predictable restoration

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8
Q

How are wedges placed

A

From the lingual for lowers buccal for uppers

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9
Q

Who carried our research on dentine pin

A

Stanley and Caputo - top in stress analysis

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10
Q

Best situation for nayyar core

A

Poor moisture control
Divergent canals

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11
Q

In an Nayyar core how far should the amalgam be placed into the canal

A

3-5mm

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12
Q

Why seal amalgam

A

Reduced risk of microleakage
Reduced risk of sensitivity

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13
Q

Dentine sealer can be

A

4,5,7th gen dentine adhesive. The amalgam is then bonded to the sealed resin

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14
Q

What are the etching times when placing an amalgam

A

20secs dentine
30secs enamel

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15
Q

What can be used to rehydrate dentine when placing an amalgam

A

Tublicid 20-30 secs a disinfectant
Or water

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16
Q

Name dentine adhesive when placing amalgam

A

4 (3stage) ,5th gen (two stage )
Resilute, panavia, amalgabond resinomer or gic cement

17
Q

What is the difference between the dentine sealer and dentine adhesive

A

The sealer cleans the dentine and provides resin tags for the dentine adhesive to bond on to

18
Q

Properties of a dentine adhesive when placing amalgam

A

4meta (bonds to resin on one side and amalgam on the other side)
Chemically cured
(Gic cement can be used and is cheaper than 4meta )

19
Q

What’s does Burnishing an amalgam achieve

A

Removes voids
Removes Mercury rich layer
Reduces chipping

20
Q

Amalgam can be polishing using

A

Brownies and greenness and ZnO powder

21
Q

Name two types of amalgam

A

Lathe cut more challenging to pack crumbly
Spherical cut

22
Q

Name a dentine adhesive

A

4meta
4,5 gen
Panavia , amalgabond resilite

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