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operative (morning) > 9+ > Flashcards

9+ Flashcards

1
Q

steps of amalgam placement

A 
activation
trituration
placement
condensation
carving
finishing
polishing
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2
Q

what’s the setting time of GREY and GREEN capped capsules?

A

grey: slow set
green: extended carving time

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3
Q

how is amalgam activated?

A

Hg is introduced to alloy

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4
Q

definition of trituration

A

trituration = mixing of amalgam = amalgamation

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5
Q

Undertrituration

A

incomplete amalgamation
poor wrking quality
granular and crumbly
decreases final strength

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6
Q

overtrituration

A

overly warm and shiny
decreases working time
decreases final strength

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7
Q

how long do we have for placement of amalgam?

A

2 mins

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8
Q

which direction do we go when condensing overfilled amalgam?

A

amalgam to tooth

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9
Q

discoid-cleoid

A

descoid is the round end

cleoid is the point end

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10
Q

which direction do we go when we carve?

A

two directions:

  1. parallel to margin
  2. from tooth to amalgam
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11
Q

what’s the problems with deep occlusal grooves?

A

thins amalgam at margins
prone to chipping
weakens the restoration

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12
Q

when do we get a submarginal amalgam?

A

underfilled

overcarved

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13
Q

when do we get a flash?

A

overfilled

undercarved

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14
Q

different matrix bands?

A 
No 1 (what we used)
No 2 (if going down to gingiva)
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15
Q

purpose of matrix bands?

A
  1. provides a wall against which we can condense amalgam
  2. re-establish proximal contact of restoration w/ adjacent tooth
  3. aids in isolation of preparation during the fill
  4. provides containment of the amalgam
  5. aids in prevention of voids
  6. helps to shape the proximal contours
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16
Q

what are the 2 spinning pars of tofflemire retainer and what are their purposes?

A

rotating spindle: changes the diameter of matrix band

set screw: attaches band to retainer

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17
Q

functions of the wedge

A
  1. prevent flash at the gingival cavosurface
  2. separates the teeth to compensate for the thickness of the band
  3. helps stabilize the matrix band
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18
Q

what’s the purpose of trituration?

A
  • to remove the oxide coating

- wet each particle of alloy w/ mercury

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19
Q

what’s the pressure that needs to be applied when condensing?

A

5-10 lbs

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20
Q

what’s the purpose of anatomical burnisher?

A
  1. final condensation
  2. remove mercury rich excess at surface
  3. begin development of occlusal grooves and fossae
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21
Q

when do we use anatomical burnisher? band on or off?

A

when amalgam is still soft

-band on

22
Q

Define quadrant dentistry

A

treating all the affected teeth in 1 quadrant / sextant during same visit

23
Q

what do we have to have balanced when doing quadrant dentistry?

A

productivity and quality of work

24
Q

advantages of quadrant dentistry

A

patient: less # of apptment, less discomfort (less injections)
dentist: more efficiency and productivity

25
Q

disadvantages of quadrant dentistry

A

increase in chairside time

26
Q

what are the sequence of treatment in quadrant dentistry?

A

phase I: emergency Tx (drain abcess)
phase II: eliminate active disease (caries and periodisease)
phase III: final prosthesis

27
Q

what are the indications to quadrant dentistry?

A

multiple carious lesions:

  • kissing cavities (adjacent interproximal caries)
  • multiple faulty restorations

patients indicated for general anesthesia/sedation
common in pediatric dentistry
medically compromised patients like severe chronic heart failure and mental disability

28
Q

what are the contraindications of quadrant dentistry?

A
  • lack of dentist experience
  • patient w/ TMJ disfunction syndrome
  • patient who can’t stay reclined for too long
29
Q

how does low copper causes marginal fracture?

A

it has gamma 2. So 2 things can happen

  1. corrosion prone: pitted appearance => marginal fracture
  2. high creep (gamma 2 doesn’t prevent gamma 1 grains from sliding against each other) => marginal fracture
30
Q

what’s the copper component of high copper and low copper amalgam?

A

low copper: 6% Cu

31
Q

what composition minimizes creep and marginal breakdown of high copper?

A

n’ (it bonds gamma 1 grains together)

32
Q

lathe cut amalgam: do we get tighter contact or open contact? why?

A

tighter contact, bzc:
lathe cut amalgam has low packing density: more porous
so, higher condensation force is required
so we get tighter contact

33
Q

spherical amalgam: do we get tighter contact or open contact? why?

A

open contact:
packs more efficiently
difficult to achieve proximal contact (bcz large diameter condensor is used for proper condensation pressure)

34
Q

what’s one disadvantage of lathe cut amalgam?

A

higher surface area: more Hg and more expansion

35
Q

composition of Permite C at OSU

A 
high copper amalgam
admixed type (spherical and lathe-cut)
Zn containing (0.2%)
36
Q

what happens if Zn is contaminated with moisture?

A

delayed expansion

37
Q

what do caps and plunger color mean?

A

caps: working time
plunger: spill size (mg of alloy)

38
Q

in quadrant do we do one tooth at a time? or do we prep all teeth first and then place amalgam for all of them?

A
  • use one bur before picking the next

- prep all teeth first and then put amalgam after

39
Q

why do we polish after “24 hrs”? (why we can’t do it right away?)

A

bcz amalgam needs to set up:

-amalgam needs to crystalize completely

40
Q

in back to back amalgam preparation, do we do conventional or quadrant dentistry? why?

A

we do conventional. because:

  1. adjacent intact tooth structure is used as a guide for restoring the other tooth’s marginal ridge
  2. contact position MD is maintained
41
Q

in quadrant dentistry, how do we do multiple adjacent class II preps when they are back to back?

A

we restore 2 non adjacent teeth at a time.

ex: if we are doing #1 (MO), #2 (MOD), #3 (DO), #4 (DO). Then we do 1 and 3 first and then we do B and D next

42
Q

difference btwn finishing and polishing?

A

finishing:

  • enhances and REDEFINES material
  • corrects minor marginal overhangs
  • eliminates roughness

polishing:

  • removes scratches and imparts a LUSTER or shine
  • creates a smooth, more easily cleaned surface
43
Q

T/F: finishing and polishing improves corrosion resistance

A

TRUE

44
Q

what are armamentation of finishing and polishing?

A

finishing: basic setup + finishing burs
polishing: rubber disks, points, and cups (Shofu set) OR rubber cup and pumice followed by high luster agent

45
Q

how can you tell the difference btwn finishing bur and regular bur?

A

finishing burs have yellow shaft

46
Q

what color are the finishing and polishing disks?

A

finishing disks: yellow to red color

polishing disks: black or dark blue

47
Q

what color stones can we find in the shofu kit and what’s the sequence of using them?

A

we go in this order:

green stone –> white stone –> brownies –> greenies –> super greenies

48
Q

steps of finishing

A
  1. create proper anatomic contours (burs/stone)
  2. remove pitted or rough surfaces (green stone)
  3. correct marginal discrepancies (white stone)
    - for interproximal area use (burs or disks)
  4. maintain proximal contact (finishing strips)
49
Q

when finishing and polishing do we use highspeed or low speed?

A

low speed

50
Q

when finishing, do we go from tooth to amalgam or the other way?

A

finishing: tooth to amalgam

operative (morning) (3 decks)

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