Definitive Impression Working Cast Pindexing

Question 1

custom trays reduce these 2 sources of error:

Answer 1

stress during removal, thermal contraction

Question 2

How does a custom try improve accuracy of impression

Answer 2

limiting the volume of material

Question 3

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

Answer 3

3-5mm

Question 4

How far fast most distal tooth should custom tray extend?

Answer 4

3mm

Question 5

Purpose of baseplate wa below custom tray:

Answer 5

to form a space

Question 6

Desired thickness of spacerP:

Answer 6

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

Question 7

os stops required in custom tray

Answer 7

4, nonfunctional unprepped teeth

Question 8

If no teeth are availabel for stops:

Answer 8

larger soft tissue stop on the crest of alveolar ridge

Question 9

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

Answer 9

photopolymerizing

Question 10

Place this between baseplate and triad:

Answer 10

MRA

Question 11

Trim Triad with this:

Answer 11

scapel blade

Question 12

Handle dimenstions:

Answer 12

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

Question 13

Cure the triad in this:

Answer 13

curing nit

Question 14

Cure Triad for __ m initially.

Answer 14

2m

Question 15

Do this bw the 2m and 6m curings:

Answer 15

apply Air Barrier Coating

Question 16

How to cure custom tray for the 2nd time

Answer 16

soft tissue side up, remove scrub clean under water

Question 17

Thickness of custom tray:

Answer 17

2-3mm

Question 18

Clearance needed bw tray and teeth:

Answer 18

2-3mm

Question 19

Type of impression material we use for definitive impressions:

Answer 19

XLV Aquasil

Question 20

What else is needed in clinic besides the definitive impression?

Answer 20

opposing alginate, FB registration, interocclusal record

Question 21

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

Answer 21

Jade Stone

Question 22

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

Answer 22

indirect technique

Question 23

Jade stone is Type:

Answer 23

5

Question 24

How to mix Jade stone

Answer 24

vaccumix

Question 25

Why use type 5 stone for orking cast:

Answer 25

minimal expansion, good strength to avoid breakage

Question 26

Prereq's to fabricating working cast:

Answer 26

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

Question 27

Thickness of working cast when first poured:

Answer 27

20-25mm above the cervical areas

Question 28

Should the palatal portion of workign cast be exposed?

Answer 28

yes

Question 29

Time for jade stone/ working cast to set

Answer 29

30m

Question 30

Dimensions of working cast:

Answer 30

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

Question 31

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

Answer 31

to allow removal of dies, prevent locking in by UC

Question 32

Degree of taper for working cast walls:

Answer 32

20'

Question 33

Pindex system is what kind of system?

Answer 33

Removable dowel system, antirotation pins prevent movement of dies

Question 34

What keeps the dies stable after repeated removal and insertion?

Answer 34

pins housd in a plastic or metal sleeve

Question 35

Pindex drill size compared to pin size:

Answer 35

exactly the same

Question 36

how is stone debris removed from pin holes:

Answer 36

air chip-blower

Question 37

do this before pouring base for the pindex:

Answer 37

suprasep

Question 38

Smaller or larger pin toward the lingual?

Answer 38

smaller

Question 39

Dies should converge toward:

Answer 39

the base

Question 40

Trimming die:

Answer 40

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

Question 41

Don't trim closer to the margin than ___mm.

Answer 41

2-3mm

Question 42

How to trim residual flash from die:

Answer 42

scalpel

Question 43

Marking the finish line:

Answer 43

red pencil, coat of die sealer, number each tooth

Question 44

Beware of this when mounting cast:

Answer 44

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

Question 45

Should you wet the cast before mounting?

Answer 45

yes (why?)