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Operative 2 > Amalgam Quiz > Flashcards

Amalgam Quiz Flashcards

1
Q

What brand of amalgam do we use in lab?

A

permite c

extended carving time

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2
Q

What type of amalgam is permite c extended carving time?

A

high copper, admix (spherical + lathe cut)

Zn containing (0.2%)

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3
Q

Name the tooth surfaces of a Class V preparation

A

axial floor
gingival wall
incisal wall

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4
Q

ALL MY DEAD FERRET LOVES ONION CHIP PARTIES

A 
Axial
Mesial 
Distal
Facial
Lingual
Occlusal/Incisal
Cervical/Gingival
Pulpal
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5
Q

What is the purpose of a matrix band?

A

isolate the preparation

condense amalgal against band

restore proximal contact and contour

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6
Q

What is the purpose of a dental wedge?

A

separate teeth to allow width of matrix band (tight contact)

seal gingival margin of proximal box

prevent overhang

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7
Q

How many wedges do you use for a MOD preparation?

A

2
one distally and one mesially
bot inserted from lingual embrasure

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8
Q

How long should you wait to polish an amalgam resotration

A

wait until amalgam has fully set (24 hours after placement)

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9
Q

What is the 2-2-2-2 rule

A

for pin placement

2mm pin hole depth
2 drill diameters inwards from DEJ
2 mm pin length
2 mm amalgam above pin

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10
Q

When is it necessary to place a pin?

A

when a cusp is missing or removed due to caries

2/3rds rule applies for this^

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11
Q

When is a cusp missing or removed due to caries?

A

2/3rds rule!

if 2/3 cusp tip to cusp tip
if 2/3 from central groove to cusp tip

must do a pin placement

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12
Q

What type of pins do we use in lab?

A

minim silver
THREADED TYPE
self shearing

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13
Q

What size PIN DRILL did we use in lab?

A

0.021/0.53 inch/mm

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14
Q

What size PIN did we use in lab?

A

0.024/0.61 inch/mm

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15
Q

How should the pill drill be oriented when placing a pin channel in a tooth?

A

parallel with root surface

to prevent pulping or damage to external tooth

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16
Q

Where should pins be located?

A

2 pin diameters inward from DEJ

at the line angle associated with the missing cusp

17
Q

Mesiobuccal cusp taken off…. the pin is plcaed at the ___ line angle

A

mesiobuccal line angle

18
Q

Ideal pulpal depth is ____

A

0.5mm into DEJ (into dentin)

but need 1.5mm for adequate amalgam condensing

19
Q

Ideal axial depth for class II prep is ___

A

0.5-0.75mm into DEJ

but need at least 1.0mm to properly condense in proximal box

20
Q

Where do caries occur on the proximal surface of a posterior tooth?

A

gingival to the proximal contact

This is why we can see them radiographically and not clinically

21
Q

List sequence of materials for minimal caries

A

RDT more than 2mm

LINER (copal varnish) –> Amalgam

22
Q

List sequence of materials for moderate caries

A

RDT is 0.5 - 2mm

Base (GI) –> LINER (copal varnish) –> Amalgam

23
Q

List sequence of materials for asymptomatic deep caries

A

RDT is less than 0.5 mm

Near pulp exposure (indirect pulp capping)

Liner (Dycal, CaOH) -> Base (GI) -> Liner (copal varnish) -> Amalgam

24
Q

List sequence of materials for deep caries with questionable pulp status

A

RDT is less than 0.5mm

Liner (Dycal, CaOH) -> Conditioner -> Base (RMGI) -> Liner (copal varnish) -> Amalgam

25
Q

What is the mixing/trituration time for amalgam

A

7 seconds

26
Q

What is the working time of amalgam

A

5 minutes

27
Q

What is the carving time of amalgam

A

7 minutes

28
Q

Describe an open margin in restoration

A

catches explorer both directions

caused by overcontouring or inadequate condensing

restoration must be replaced

29
Q

Describe flash in a restoration

A

catches explorer tooth to amalgam

excess material will chip off and undermine restoration if mixed

flash must be carved flush with cavosurface margin of prep

30
Q

Describe submarginal margin in restoration

A

catches explorer amalga to tooth

caused by overcarving

if less than 0.2 mm -> enameloplasty

if more than 0.2mm -> replace restoration

31
Q

What happens if you increase trituration time of amalgam?

A

soup consistancy

sets prematurely

32
Q

What happens if you decrease trituration time of amalgam?

A

dull, grainy/crumbly appearance

difficult to work with

decreased strength

33
Q

What is the weakest phase in low copper amalgam

A

gamma 2

results in low corrosion resistance leading to marginal breakdown

Operative 2 (1 decks)

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