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indirect Restoration > Definitive Impression Working Cast Pindexing > Flashcards

Definitive Impression Working Cast Pindexing Flashcards

1
Q

custom trays reduce these 2 sources of error:

A

stress during removal, thermal contraction

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2
Q

How does a custom try improve accuracy of impression

A

limiting the volume of material

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3
Q

How far from gingival margin should custom try outline be placed?

A

3-5mm

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4
Q

How far fast most distal tooth should custom tray extend?

A

3mm

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5
Q

Purpose of baseplate wa below custom tray:

A

to form a space

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6
Q

Desired thickness of spacerP:

A

2-3mm, trim back till pencil line is barely visible

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7
Q

os stops required in custom tray

A

4, nonfunctional unprepped teeth

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8
Q

If no teeth are availabel for stops:

A

larger soft tissue stop on the crest of alveolar ridge

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9
Q

What type of material is the Triad that we mack custom trays with?

A

photopolymerizing

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10
Q

Place this between baseplate and triad:

A

MRA

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11
Q

Trim Triad with this:

A

scapel blade

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12
Q

Handle dimenstions:

A

15-20mm high, 20-25mm wide, 25-30 from proximal view, 45’ angle

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13
Q

Cure the triad in this:

A

curing nit

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14
Q

Cure Triad for __ m initially.

A

2m

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15
Q

Do this bw the 2m and 6m curings:

A

apply Air Barrier Coating

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16
Q

How to cure custom tray for the 2nd time

A

soft tissue side up, remove scrub clean under water

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17
Q

Thickness of custom tray:

A

2-3mm

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18
Q

Clearance needed bw tray and teeth:

A

2-3mm

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19
Q

Type of impression material we use for definitive impressions:

A

XLV Aquasil

20
Q

What else is needed in clinic besides the definitive impression?

A

opposing alginate, FB registration, interocclusal record

21
Q

The definitive (working/ final) cast is poured with this type of stone:

A

Jade Stone

22
Q

Technique used to fabricate indirect restos and prostheses using the working cast:

A

indirect technique

23
Q

Jade stone is Type:

A

5

24
Q

How to mix Jade stone

A

vaccumix

25
Q

Why use type 5 stone for orking cast:

A

minimal expansion, good strength to avoid breakage

26
Q

Prereq’s to fabricating working cast:

A

prepped and unprepped tooth surfaces, adjacent unprepped teeth free of voids, teeth in anterior guidance complete, all occlusal surfaces accurate, all relevant soft tissue

27
Q

Thickness of working cast when first poured:

A

20-25mm above the cervical areas

28
Q

Should the palatal portion of workign cast be exposed?

A

yes

29
Q

Time for jade stone/ working cast to set

A

30m

30
Q

Dimensions of working cast:

A

100mm thick above cervical areas, base parallel to occlusal plane

31
Q

Why do we taper the B and L folds of the working cast:

A

to allow removal of dies, prevent locking in by UC

32
Q

Degree of taper for working cast walls:

A

20’

33
Q

Pindex system is what kind of system?

A

Removable dowel system, antirotation pins prevent movement of dies

34
Q

What keeps the dies stable after repeated removal and insertion?

A

pins housd in a plastic or metal sleeve

35
Q

Pindex drill size compared to pin size:

A

exactly the same

36
Q

how is stone debris removed from pin holes:

A

air chip-blower

37
Q

do this before pouring base for the pindex:

A

suprasep

38
Q

Smaller or larger pin toward the lingual?

A

smaller

39
Q

Dies should converge toward:

A

the base

40
Q

Trimming die:

A

adequate marginal access needed, should show 0.5mm to 1mm of unprepared tooth beyond margin

41
Q

Don’t trim closer to the margin than ___mm.

A

2-3mm

42
Q

How to trim residual flash from die:

A

scalpel

43
Q

Marking the finish line:

A

red pencil, coat of die sealer, number each tooth

44
Q

Beware of this when mounting cast:

A

put wax in place of the red pin stpppers that were removed to separate the dowels from the mounting stone

45
Q

Should you wet the cast before mounting?

A

yes (why?)

indirect Restoration (54 decks)

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