Vocabulary
This is the curing reaction (change begins when the base and cataylst are mixed)
Poymerization
This heats up the hydroplastic beads/wafer to a clearish blue color.
Water bath
Which viscosity of elastomeric impression material comes in 2 containers and is kneaded by hand?
Putty
Reversible hydrocolloid should be boiled at 212F for ______ minutes.
10 minutes
can be reboiled up to 4 times
How should a hydroplastic custom tray be disinfected?
Could spray disinfect (Cavicide & let sit for 3 minutes)
OR
Immersion Disinfection: (Sodium Hypochlorite Solution- 1:10 ratio for 10 minutes)
1 oz bleach; 10 oz water
These are areas in and around the teeth
Undercuts
These are fillled with wax to prevent the tray from locking on.
___________serves as a spacer (2-3 mm) and leaves room for impression material
Base plate wax
What is the main advantage of polyether?
It doesn't have to be poured up right away
Storage Unit
150F for 5 days
Which type of elastomeric impression material must not be immersed for disinfection?
Polyether
Hydroplastic material can be boiled and reboiled therefore it is:
Remoldable
Custom trays are prepared before or after the teeth are prepared?
Before
Elastomeric (rubber base) impression material is used when:
Anatomical exactness is critical
The reversible hydrocolloid impression stays in the patient's mouth for ____minutes.
5
Which gypsum is used to pour up final impressions?
Die Stone 22/100
Are placed to prevent the tray from seating too deeply onto the arch or quadrant
Stops
Uniform thickness of about _____ of an inch is recommended throughout the tray.
1/16th
Light body elastomeric impression material is used for:
Syringe only
What has to be done to reversible hydrocolloid impression material in the tray after it is removed from tempering, and before it is placed in the patient’s mouth?
Remove the smear layer with a 2x2
When mixing, 1st coat the spatulaa in the base or catalyst?
Catalyst
Has the ability to melt with the use of heat
Thermoplastic
Hydroplastic material covers the cast ____inch from the bottom.
1/8th inch
Which of the elastomeric impression materials has high dimensional stability and low tear resistance?
Polysiloxane
The far right compartment (tempering unit) is for the tray material only. What temperature is the tempering unit and how long is the tray material tempered?
115F
5 minutes
This is used to make the die removable
dowel pin