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indirect Restoration > May 23, 2016 > Flashcards

May 23, 2016 Flashcards

1
Q

Type of wax used when making definitive impression:

A

Boxing wax, warmed and sticky wax to hold in place

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2
Q

What do we pour up from the definitive impression?

A

Working cast

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3
Q

What needs to be captured in the working cast poured up from he definitive impression?

A

tooth surfaces, residual ridge area (?), other parts of the dental arch, facial structures used to fabricate restoration or prosthesis in the lab

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4
Q

2 other names for working cast:

A

definitive/ final cast

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5
Q

artificial crowns and fixed partial dentures are made using this technique:

A

indirect technique

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6
Q

What type of stone do we use to pour the definitive cast?

A

Jade Stone, Type V

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7
Q

Why do we want Jade stone for the working cast since it has the highest expansion within gypsum materials?

A

to compensate for the shrinkage of the metal when casting crown

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8
Q

What must be done before taking definitive impression?

A

surrounding teeth free of voids, teeth involved in anterior guidance intact, all occlusal surfaces accurate, all relevant soft tissue duplicated

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9
Q

Why do we add light body to the occlusal surfaces?

A

to ensure accurate occlusion of opposing cast

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10
Q

The working cast should be POURED to this thickness with the Jade stone:

A

20-25 mm above cervical area, leaving palatal portion as exposed as possible

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11
Q

How long does it take for Jade stone to set?

A

30min (10min to set, 30 minutes to remove)

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12
Q

How to trim the base of the working cast:

A

parallel to occlusal plane

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13
Q

Thickness to trim the working cast:

A

10mm above the cervical areas (edentulous area)

Why is it necessary to have 10-15mm extra base just to trim down? ask

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14
Q

Tools to trim the B and L folds of the working cast:

A

arbor band, cast trimmer, carbide cutter (in a lathe)

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15
Q

How should the working cast be tapered, angle?

A

at base, 20 degrees, to prevent locking in by undercut

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16
Q

What helps the working cast to come out of the base easily?

A

smoothness and taper of the way at the base

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17
Q

Positioning of the pin holes of CCC30 preparation:

A

18, 22 (cingulum), 28 (slightly lingual), 30, 31

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18
Q

Where to mark the location of the pinholes:

A

occlusal surface of each die, the adjacent teeth and the neighboring edentulous area

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19
Q

How does the Pindex system minimize the rotation of the dies?

A

anti-rotational mechanism (is this the face that there are 2 legs to each pin? ask)

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20
Q

Why do the dies remain stable after repeated removal and insertion?

A

because the pins are housed in a sleeve (plastic or metal)

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21
Q

True or False? The size of the drill should be 1 size larger than the pin.

A

F. same size

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22
Q

How are the holes drilled in the pindex system?

A

thumbs on oclusal surface of cast, lift handle with the fingers of both hands, move drill up and down or pushing the table down with the cast.

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23
Q

How do you know if you are at proper depth when drilling the pinhole?

A

the red beam will automatically shut off.

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24
Q

How to remove stone debris from the pinholes:

A

air chip-blower

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25
Q

Apply this to the heads of the pins before placing them in the pinholes:

A

cyanoacrylate adhesive

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26
Q

Steps after placement of the pins:

A

add metal sleeves and plastic caps

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27
Q

Apply this to the stone surface around the pins before placing the cast in a base former:

A

separating medium, ie Super-sep

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28
Q

Type of stone used to pour up the Pindex working cast around the pins:

A

microstone (vacumix again), add around pins before flipping into base tray

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29
Q

Allow the microstone base to dry for:

A

30 min

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30
Q

What to do after base dries for 30min:

A

trim sides, remove base former and base stopper (plastic caps)

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31
Q

What are the plastic caps called?

A

base stoppers

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32
Q

When should you grind the metal pins and sleeves with e-cutter or model trimmer?

A

never

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33
Q

How to cut out the die?

A

saw blade, “cast must pass completely through the first layer of the stone” ? just pull out, right?

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34
Q

Taper of cuts for the index working cast die:

A

converged toward base

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35
Q

True or False? It is ok if you damage the finish line when cutting out the die.

A

F. Don’t damage proximal contacts either

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36
Q

How much beyond the finish line should remain when trimming the die?

A

0.5 to 1mm of prepared tooth beyond the finish line

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37
Q

True or False? Adequate access to the finish line is imperative.

A

T

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38
Q

What stone should remain after trimming the die?

A

the critical few mm’s adjacent and critical to the finish

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39
Q

How to remove the stone that is closer to the finish line:

A

large then small carbide bur. Don’t touch finish line.

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40
Q

Does the smaller or the larger pin go toward the lingual?

A

smaller, because the lingual edge is more narrower

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41
Q

How to remove any residual flash:

A

sharp scalpel, preserve tooth structure immediately apical to finish line

42
Q

How should the die and cast be labeled before sending to the lab?

A

each die and adjacent tissues are numbered

43
Q

Why do we number each die and adjacent tissues?

A

identification during the lab procedures

44
Q

How can you protect the trimmed die after marking the finish line with a red pencil?

A

light coat of die sealer or cyanoacrylate cement that we used for pins (all surfaces)

45
Q

Do this before mounting casts on the articulator:

A

utility wax or baseplate wax over the pins/ end of the dowels (remove the red plastic capillaries) (no scoring?)

46
Q

Why do we place utility wax over the dowels/ pins?

A

to separate them from the mounting stone (articulator will be upside-down for mounting)

47
Q

Mounting working cast:

A

wooden sticks to hold in occlusion, wet cast with paper towel (no scoring?)

48
Q

How to place the wax:

A

sectionally or from #18-#30, peel off after mounting stone is smoothed

49
Q

What is used for slow speed mixing on the Vac-U-Mixer?

A

drive chuck

50
Q

Black knob on Vac-U-Mixer:

A

Vibrator

51
Q

What should be with the lid (lead) of the Vac-U-Mixer?

A

O ring

52
Q

Metal piece sticking out of lid (lead) of the Vac-U-Mixer:

A

slotted drive nut

53
Q

Before using the Vac-U-Mixer bowl, make sure:

A

it is dry

54
Q

Mix __ mL of water with the Jade Stone:

A

15.5 mL with 70g of stone

55
Q

True or False? you must mix the Jade stone before using the Vac-U-Mixer.

A

T, 20-30 seconds

56
Q

Rotate the bowl in this direction to lock the Vac-U-Mixer in place.

A

clock wise

57
Q

Why should you press the bowl and lid (lead) of the Vac-U-Mixer together?

A

to seat bowl on O ring in lid (lead)

58
Q

Connect what to what after closing the Vac-U-Mixer lid (lead)?

A

metal nozzle (at end of vacuum hose) to top of lid (lead)

59
Q

How to start the Vac-U-Mixer:

A

insert slotted drive nut into drive chuck, starts automatically

60
Q

Why do we move the manual switch to the on position during mixing?

A

so pump continues to run after the Vac-U-Mixer is disengaged Why? Ask

61
Q

The vacuum gauge of the Vac-U-Mixer should be between:

A

25 and 30

62
Q

Mixing time for plaster, stone in mixer (check): Microstone?

A

10-15

63
Q

Mixing time for die material in mixer (check): (jade stone?)

A

20-30

64
Q

What do you do after disengaging the Vac-U-Mixer?

A

move mixing bowl to vibrator (to help get lid (lead) off?)

65
Q

Steps after mixing is completed:

A

disconnect vacuum, open lid (lead), turn to “off” position, wash lid (lead), bowl, and hand spatula (sequence?)

66
Q

Which stones have lower expansion rates than Jade Stone?

A

Resin rock, Lind rock, Hard rock, then Gypsum (backward alphabetical)

67
Q

Which type of sleeves are the most stable?

A

metal

68
Q

Placement of pinholes in the anterior:

A

over cingulum

69
Q

How to trim the mounting cast:

A

1mm of microstone (around gingiva? check)

70
Q

Stone to use when pouring second pour of the definitive impression: we use the same impression?

A

Jade stone, called solid cast

71
Q

True or False? The Solid cast should be pindexed.

A

F. This cast is only for technician

72
Q

Are large/small carbide burs synonymous with e-cutters?

A

ask

73
Q

Blade strokes should be in either of these 2 directions when trimming the die:

A

O-G (G-O, right?) or horizontally

74
Q

Where to add utility wax

A

pinhole area or entire rim of cast

75
Q

Why do we want such a large space (more than the width of one piece of wax) in the anterior portion of our cast?

A

ask, this happened in one video, not the other

76
Q

Point of defining finish line in red pencil:

A

tells the lab technician EXACTLY where the finish line should be placed

77
Q

How big of a gap should you have between the base and the working cast?

A

none

78
Q

What is the vibrator used for?

A

removing the nozzle after mixing (and lead/lid?)

79
Q

How does the vibrator help to remove the lid (lead)?

A

ask

80
Q

In what shape should you trim the working cast?

A

arch

81
Q

True or False? Super-Sep should be applied to the metal pindex pins as well as the facial border of the cast.

A

F to the pins, T to the facial border

82
Q

The position of each saw cut should be:

A

parallel to the dowel with a pencil (?) so dowel should be perfectly centered BL?

83
Q

Which teeth are we making die of?

A

29, 30

84
Q

The cast must pass completely through:

A

the first layer of stone (?) just needs to lift out, right?

85
Q

How do you protect the fragile die when sawing them out?

A

with a soft cloth

86
Q

How should you trim the margins of the die?

A

don’t!

87
Q

Why does unprepared tooth structure adjacent to the tooth being prepped have to be preserved?

A

to identify contour of the tooth

88
Q

Purpose of covering the dowels with wax before mounting:

A

to separate them from the mounting stone

89
Q

% expansion of Jade stone:

A

18%

90
Q

Function of the metal sleeve and red rubber tips:

A

increase life span of model, prevents wear

91
Q

Spray the definitive impression with this before pouring up:

A

debubblizer, then remove with air syringe

92
Q

Working time when pouring up the definitive impression:

A

5-7 minutes

93
Q

How do you avoid trapping air bubbles when pouring up the definitive impression?

A

debubblizer and adding stone a little at a time

94
Q

Setting time after pouring up the definitive impression:

A

10 minutes, separate after 30 minutes

95
Q

Stone for working cast, “” “” around the pins, and “”” second pour:

A

Jade, microstone, Jade

96
Q

Pour this/these with Jade stone:

A

working cast, solid cast

97
Q

Pour this/these with microstone:

A

base for working cast

98
Q

What are dowels?

A

The ends of tube pins?

99
Q

How to speed the setting time of the cyanoacrylate when adhering the pins in the cast:

A

1 drop of PMMA monomer

100
Q

How to trim the microstore base:

A

1-2mm of land area for the base

101
Q

From which angle should you mark the finish line?

A

from the occlusal angle

102
Q

What maxillary cast are we mounting against?

A

use existing maxillary cast

indirect Restoration (54 decks)

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