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Direct Restoration > Fall Lecture 2: Amalgam Finishing and Polishing > Flashcards

Fall Lecture 2: Amalgam Finishing and Polishing Flashcards

1
Q

When do we finish the amalgam restoration?

A

same day it’s placed

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2
Q

instruments to finish amalgam:

A

discoid, cleoid, rotatory

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3
Q

Polishing:

A

smooth amalgam to high gloss/ luster

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4
Q

TF? The clinical outcome will be compromised if the amalgam is not polished.

A

F. Prognosis the same.

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5
Q

Purpose of finishing

A

no uneven areas bw amalgam and cavity prep wall, ensure contour and occlusion are correct, resto is smooth

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6
Q

Is it more important to finish high copper or low copper amalgam?

A

low copper, high copper less susceptible to tarnish and corrosion (no g2 phase)

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7
Q

When to polish amalgam:

A

at least 24h after placement

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8
Q

What can sometimes serve as a viable substitue for conventional polishing?

A

pre-carve burnishing in conjunction w post-carve burnishing

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9
Q

TF? If the amalgam restoration is not smooth after 24h and you are ready to polish, you should smooth, but you must wait another 24h’s.

A

F. Refinish, then polish

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10
Q

This will occur if there is a gap between the amalgam and the cavity prep:

A

marginal leakage

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11
Q

Effects of proper condensation:

A

red marginal leakage, Hg content in resto, and corrosion, inc strength and marginal integrity

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12
Q

Condensors for finishing, condensor for overpacking

A

smaller, larger

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13
Q

Explain the condensing strokes:

A

each condensing stroke should overlap the previous

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14
Q

How much to overpack amalgam:

A

1mm+

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15
Q

Overpacking prevents:

A

undercontouring of resto

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16
Q

General condesation time:

A

2.5 - 3.5m

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17
Q

Type of condensor for spherical amalgam:

A

large condensor (plastic, buttery consistency)

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18
Q

Type of condensor initially used for admixed amalgam:

A

small condensor, more resistant to pressure

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19
Q

condensor with 2X the diameter requires how much more pressure?

A

4X

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20
Q

Pre-carve burnishing:

A

to ensure marginal amalgam is well condensed before polishing, burnishing immediately after over packing (M-D and F-L)

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21
Q

benefits of pre-carve burnishing:

A

denser amalgam at margin, excess Hg release (?), inc marginal adaptation

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22
Q

Size of ball burnisher to choose for pre-carve burnishing:

A

head contacts cusp slope but not margin

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23
Q

When to carve amalgam:

A

immediately after pre-carve burnishing

24
Q

Best instrument for carving:

A

cleiod/ discoid carver, larger end at beginning

25
Q

Which has a sharper end, discoid or cleoid?

A

cleioid

26
Q

Instrument to use to carve CG and pit and fissure areas::

A

cleioid

27
Q

Position of discoid blade for carving:

A

edge perp to resto margin, resting on unprepped tooth, prevents overcarving amalgam, creates continuity of surface contour

28
Q

Carver should be pulled in a direction parallel to:

A

the margin of the prep

29
Q

Major issue with leaving flash:

A

chip away, damage margin, marginal leakage

30
Q

Post-carve burnishing:

A

light rubbing of surface of carved amalgam resto w burnisher (PKT3 burnisher, small burnisher) smooth, but not shiny appearance, don’t create grooves

31
Q

How to check finishing:

A

check occlusion (before and after procedure), explorer around margins (don’t scratch restoration)

32
Q

Type of contact amalgam should have (CG of molar)

A

light occlusal contact

33
Q

Appearance of heavy contact on amalgam:

A

dark area with shiny center

34
Q

How to adjust occlusion on amalgam or make a continuity of surface contour across the margin:

A

finish with different shapes of carbide burs, fine-grit white alumina stone or green carborundum stone

35
Q

Which is more aggressive, fine-grit white alumina stone or green carborundum stone

A

green

36
Q

How to blunt the tip of finishing stone:

A

diamond wheel, helps prevents alteration of the anatomical features

37
Q

Amalgam restoration is surfaced with:

A

a round finishing bur

38
Q

Position to hold the finishing stone:

A

long axis of stone or the bur’s long axis at a R angle to the margin

39
Q

Instrument to use after finishing stone or bur:

A

large, round finishing bur

40
Q

Pre-polishing step if the resto is not smooth enough yet and is already set, can’t smooth anymore:

A

rubber prophy cup w wet pumice, tin oxide in water or alcohol carrier for high luster, faster, creates luster

41
Q

Shapes of carbide finishing burs we have:

A

bullet, neumeyer, egg, long pear

42
Q

use brownie and greenie for:

A

finishing and polishing

43
Q

To polish convex surfaces:

A

Sof-Lex discs (composite or amalgam), high luster and finishing polishing, abrasive impregnated polishing cups

44
Q

To polish concave surfaces:

A

abrasive impregnated polishing tips

45
Q

Should polishing begin with the coarse rubber abrasive disc/ cup/ point on high or low speed?

A

low speed, just above “stall out” speed

46
Q

How long should amalgam w smooth surface take to shine w first, coarse disc/ cup/ point?

A

few sec, if not, refinish with finishing bur and repolish, point should get rid of all scratches (same thing w each successive, finer grit)

47
Q

3 reasons to polish at low speed, just above “stall out” speed with the presence of air-water coolant:

A
  1. point disintegrates at high speeds. 2. over-heating of resto –> pulpal damage. 3. Heat brings liquid Hg to surface, causing excessive volatilization of Hg and weaker amalgam surface.
48
Q

Appearance of amalgam when over heated:

A

cloudy, even though it may have a high polish (Hg has been brought ot surface, corrosion, loss of strength

49
Q

Purpose of wedge in Topplemeyer placement:

A

recreate embrasure

50
Q

Fxn of inner knob of Topplemeyer:

A

changes diameter of matrix band

51
Q

Ends of matrix band fit into:

A

vice

52
Q

The matrix band can go to the R or the L through the:

A

guide slots

53
Q

guide slots always face toward:

A

gingiva

54
Q

Which knob to turn to tighted the matrix band:

A

inner

55
Q

Insert wedge from buccal/lingual aspect:

A

lingual, only needed on side of missing wall

56
Q

How to take off Topplemeyer:

A

unscrew outer knob, releases the band ends

57
Q

Why remove Topplemeyer while leaving the band, initially?

A

prevent material from crumbling interproximally

Direct Restoration (23 decks)

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