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amalgam > intro to amalgam restorations (#30 OB powerpoint) > Flashcards

intro to amalgam restorations (#30 OB powerpoint) Flashcards

1
Q

what kind of handpieces do you need for an amalgam restoration

A 
Discoid cleoid carver
1/2 hollenbach carver
Anatomical carver
Large Condenser
Small Condenser
Amalgam Carrier
Pig Tail
Sickle explorer
Mouth mirror
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2
Q

what color is the extended carve capsul

A

green

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3
Q

Brand
Company
alloy
of our amalgam capsule

A

Permite C
SDI
Admixed(lathe and spherical particles)

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4
Q

color of fast set amalgam capsules

A

beige

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5
Q

where is the mercury in the amalgam capsule

A

in the colored cap

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6
Q

Trituration

A

the process by which mercury is allowed to react with alloy powder

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7
Q

what end of the amalgam carrier is used to place amalgam in the prep

A

the largest end that fits

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8
Q

what to do with the first increment of amalgam added to the prep

A

spread gently on the pulpal floor

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9
Q

description of proper trituration

A 
uniform consistent mass
shiny surface
smooth
optimal mech properties/compresive strength/tensile strength
optimal physical properties
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10
Q

description of overtrituration

A

soupy
difficult to remove from capsule
excess matrix
sets premature

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11
Q

description of proper mix due to trituration

A

shiny and soft, warm as removed from capsule

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12
Q

description of undertrituration

A

grainy
crumble and dull
weak
hard to handle

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13
Q

what is condensation

A

process of compressing the alloy into the tooth preparation and eliminating all voids

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14
Q

when is condensation performed

A

3-4 minutes, to avoid cracks

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15
Q

purpose of condensation

A
  1. securation adaptation of amalgam to the walls, line angles and margins
  2. maintains homogeneity and compactness of amalgam by minimizing voids
  3. expressing the residual mercury to the surface to form mercury rich matrix that will be later carved out
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16
Q

Oregon 2 condensor end sizes

A

1 and 1.5 mm

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17
Q

oregon 4 condesnor end sizes

A

2 and 2 mm

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18
Q

pressure equation

A

P=F/A

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19
Q

pressure given by large and small condensors

A

large: low
small: high

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20
Q

when to use small vs large condensor

A

small: lathe cut
Large: spherical

21
Q

when to do condensation

A

in a dry field

right after trituration

22
Q

strokes for condensation

A

vertical overlapping

pressed into all angles of the preparation

23
Q

description of proper condensation

A

shiny rich mercury phase is visible as condensation of adequate/hear a crunch

24
Q

direction to condense for 1st increment

A

added to center and condense from center to periphery

25
Q

how should the larst increment be added

A

overfilled, going beyond external outline of preparation by 1.0 mm using the large condenser

26
Q

condensation strokes

A

vertical: perpendicular to long axis or at 45 degrees
lateral: parallel of long axis or at 45 degrees

27
Q

where to use lateral condensation strokes

A

Class I with extension
Class I with narrow outline in the groove
Class 2 proximal box

28
Q

why overfill

A

extract mercury rich matrix to the surface

seal margins

29
Q

extended carving time (condensation time and carving time

A

condensation: 5min

Carving time: 7 min

30
Q

how should amaglam feel during carving

A

offer some resistance

31
Q

purpose of carving

A

reproduce the tooth anatomy and contours

remove the mercury rich matrix

32
Q

shape of discoid cleoid

A

discoid: round
Cleoid: pointed claw shape

33
Q

carving instruments used

A

discoid-cleoid
Hollenback
Interproximal carver

34
Q

how to do a pull stroke

A

gentle light pressure, moving carver parallel to the margin
rest of tooth and on amalgam
tip in the central goove
NO fulcrum on the cavosurface margin (submarginal or undercontour then

35
Q

when to do a push stroke

A

to define the developmental gooves

36
Q

direction of a push stroke

A

tooth structure to amalgam

37
Q

How to evaluate a restoration

A

Check cavosurface margin for flash, underfilling, or voids
Check anatomy
check centric oclusion with acufilm
check excursive movements
run tip of exploere along Cavosurface margin from tooth to amalgam and vice versa

38
Q

what is ideal carving

A

restores anatomy
outline looks like the prepared cavosurface margin
junction of external tooth strucutre should be flush with no excess or deficiencies

39
Q

errors in tooth filling

A

Open margin
Submarginal
Flash

40
Q

open margin

A

break between tooth and amalgam restoration
traps food and allows passage for microbes
must be redone

41
Q

submarginal

A

seal between amalgam and the enamal not broken.

less than .2mm, then left, and do enameloplasty

42
Q

problem with flash

A

if patients bites, it may break and leave a marginal discrepancy

43
Q

treating flash

A

removed during carving

44
Q

cause of open margin

A

marginal voids due to inadequate condensation

Carving from amalgam to tooth

45
Q

treating an open margin

A

replace

46
Q

cause of submarginal area

A

carving amalgam to tooth

47
Q

detecting submarginal area

A

explorer catches from amalgam to tooth, but not if tooth to amalgam

48
Q

result of overcarving

A

submarginal defects

no occlusion

49
Q

result of undercarving

A

flash remains

poor occlusal anatomy

amalgam (5 decks)

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