Border Molding Flashcards
(33 cards)
The custom tray should extend to ____ mm short of the depth of the vestibule.
2
Which area is typically under-recorded in the impression?
lingual frenum
Over-extension of the impression will result in ______.
overextended flanges and sore spots
What should the patient do with their tongue during the impression?
Raise it to the roof of the mouth, then stick in out in all directions
How do you mark frenums in the patient’s mouth?
with an indelible transfer stick
….indelible? something that will not be removed easily
If using green compound (we used PVS), you must ____ the compound over a broad area.
Heat
After heating the compound, how do you place it into the custom tray?
allow it to “sag into the tray”
-do HALF THE MOUTH at a time-
Before inserting the tray with compound into the patient’s mouth, what should you do?
TEMPER the compound to ensure that is just above the fusion temperature (140 degrees)
What is the fusion temperature of green compound?
140 degrees F
When inserting the tray, you should stand at ____o’clock and pull the lips up/over the tray.
7
What do you look for when inspecting the tray/compound?
no show-throughs
adequate thickness
trim away any excess after border-molding is complete
True or False: Compound will not stick to a wet tray.
True
Before trimming excess compound, you must _____ it.
chill
After trimming: heat compound with torch, temper in hot water, and then ________.
reinsert in the mouth….chill…dry
What do you do after border molding?
- apply adhesive to custom tray
2. take the final impression
How do you prepare the impression material (if you’re not using PVS material)?
3 strips of base + 3 strips of catalyst
- use three tongue blades
- use the tip of the blade and swirl the base and catalyst
- toss the first blade
- fill the custom tray from one side to the other, avoid air bubbles by adding small increments and pushing the material in front of the blade (not dragging it)
True or False: you must hold the tray firmly in place during the entire impression.
True
What does “tray movement” cause?
folds and flash
What is impregum?
the polyether tray impression material
-we used medium body for the border and light body for the impression
When making the custom tray, how many layers of base plate wax did we place?
two
What goes on top of the wax?
- First Triad model releasing agent (vaseline)
- Then Triad Material
The triad material should be trimmed to _______.
match the wax beneath it
Place a _______ handle for the mandibular tray.
vertical
How thick should the custom tray be?
1.0-1.5 mm thick all the way around and 1.0-2.0 mm short of the depth of the vestibule
