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88 Cards in this Set

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What is the component forming the main structure of the set material?
base
What is a component of the reaction that speeds up the setting reaction and is similar to the catalyst?
accelerator
What is a component that initiates the setting reaction, but usually does not become part of the final product?
catalyst
What is the lightly cross-linked material having elastic behavior after setting?
elastomer
What is a single-component material that is viscous enough to serve as a tray material yet serves as a syringe material after shear-thinning?
monophase
What is the time-dependent pseudoplastic behavior of materials characterized by the gradual decrease of viscosity under a constant applied shear rate?
Thixotropic
What is the characteristic behavior or a material that behaves intermediate to an elastic solid (spring) and a viscous fluid (dashpot)
viscoelastic behavior
ADA/ANSI spec #__ divides elastomeric impression materials into 3 types based on what?
19, selected elastic properties and dimensional change of set material
There are four classes in each of the three types of elastomeric materials... these 4 types are based on what?
viscosity
The alternate classification of elastomeric impression material divides them into 4 types (instead of 3) based on what?
chemical composition
Elastomeric impression materials are (chain/cross)linked polymeric (1/2/3/4/5) paste materials that set be (reversible/irreversible) chemical reaction
cross, 2, irreversible
Elastomers are used to obtain (very/not very) accurate impressions for indirectly-fabricated restorations
very
Elastomers (do/do not) require tray adhesive
do
Polymerization shrinkage of elastomers should be (towards/away from) the tray
towards
Elastomers are removed using (slow/rapid) removal
rapid
What type of metal is used in a polysulfide?
Titanium (TiO2)
Which component of the polysulfide contains lead dioxide?
catalyst
The polymer (for polysulfide) is contained in the:

A white base paste
B brown reactor/accelerator paste
A. white base paste
What are the retarders in polysulfide?
oleic/stearic acid
Groups of _H in base polymer are cross-linked with lead dioxide
S
lead dioxide is a(n) (oxidizing/reducing) agent
oxidizing
lead dioxide is what color?
brown
In the setting reaction of Polysulfide, the polysulfide is created. What else is formed?
Water
Polymer is hydro(phobic/philic) in nature (in polysulfide)
hydrophobic
polysulfide must be left to set for how many minutes?
10
What is the process called that forms disulfide bonds and lengthens chains in the polysulfide setting reaction?
vulcanization
polysulfide has the (highest/lowest) tear resistance of ALL impression material
highest
polysulfide should be removed (quickly/slowly)
slowly (NOTE: all others removed quickly up to this point!)
polysulfide has the (quickest/slowest) elastic strain recovery and (most/least) permanent deformation after compressive strain
slowest, most
polysulfide should be poured within __ min but is better if poured immediately
30
polysulfide has what % setting shrinkage?
0.3-0.4%
True or False, polysulfide requires a custom tray
True
What happens if lead dioxide gets on clothing?
stains it
polysulfide is used for what?
preparing crowns, bridges, inlays, onlays, and denture fabrication
How should you disinfect polysulfide?
soak in 2% gluteraldehyde for 10-15 min
What is the reinforcing agent added to silicone impression materials?
silica (drrrrr...)
addition silicone impression materials forms (volatile/non-volatile) by products
non-volatile
Early versions of silicone impression materials released what element?
hydrogen
What is the base in condensation silicone impression materials?
alpha-omega-hydroxy-terminated polydimethyl siloxane with colloidal silica or metal oxide filler (what did I just type...)
What is the accelerator in silicone impression materials?
tri or tetra functional alkyl silicates and stannous or tin-octoate
In silicone impression materials, silicone is created along with what other byproduct?
ethanol
What is the name for the technique where highly-filled high-viscocity putty material is used in conjunction with low-viscosity material to compensate for shrinkage of silicone impression materials?
putty-wash
True or False, custom trays must be used with the putty-wash technique
False, stock trays are fine
(condensation/addition) silicones release volatile by-products
condensation
condensation silicone products have what % shrinkage?
0.03-0.06%
condensation silicone impression materials are hydro(phobic/philic) and need a (dry/wet) environment
hydrophobic, dry
condensation silicone impression materials are (easy/hard) to pour without getting bubbles
hard
condensation silicone impression materials need to be poured within __ min but after the __ has evaporated
30, ethanol
condensation silicone impression materials have (good/poor) working time and (high/low) tear strength
good, low
(Condensation/Addition) silicone impression materials are more commonly used
addition
condensation silicone impression materials have (good/poor) dimensional stability
poor
What are two names for addition silicone materials?
polyvinyl soiloxane, vinyl polysiloxane
The following describes the (base/catalyst) of addition silicone materials:

polymethyl hydrogen siloxane and reinforcing filler
base
The following describes the (base/catalyst) of addition silicone materials:

divinyl polydimethyl siloxane, reinforcing filler and chloroplantinic acid
catalyst
What volatile byproduct is formed with addition silicone materials?
None! sometimes H2 can be released but this is technically not a by-product
addition silicone materials set when there is addition polymerization with cross-linking of ___ silicone groups to hydride groups
vinyl
What can be added to absorb H2 so that pouring can begin sooner?
Pt/Pd (either of these metals)
What is the shrinkage % of addition silicone materials?
0.05-0.16%
True or False, addition silicone materials can only be used once
False, can be poured repeatedly
True or False, no custom tray is needed with addition silicone materials
True
addition silicone materials are hyrdo(phobic/philic)
hydrophobic
What is added to some addition silicone materials to make it more hydrophilic?
surfactant
You should wait __min before pouring in addition silicone materials to permit release of H2
60min (aka 1 hour)
What component of latex gloves can INHIBIT the setting of addition silicone materials?
sulfur
addition silicone materials have the (best/worst) dimensional stability
best
addition silicone materials is (cheap/expensive)
expensive
addition silicone materials are used for what?
crowns, bridges, inlays, onlays, dentures
How do you disinfect addition silicone materials?
gluteraldehyde for 10-15 min
What type of silicone are used as bite registration materials?
addition silicones
This is an example of what side group?

-C-O-C-
ether
addition silicone materials as bite registration materials are dispensed how?
automixing cartridge or with a two sided bite tray
The following describes the (base/accelerator) of polyether

polyether pre-polymer, colloidal silica filler, glycolether or phthalate plasticizer
base
The following describes the (base/accelerator) of polyether

sulfonate ester initiator, imine catalyst
accelerator
polyether has a (high/low) modulus of elasticity
high
polyether shrinks about __% on curing
0.15%
Working and setting times are (long/short) with polyether
short
polyether are (good/bad) for gaggers but (good/bad) for multiple preparations
good, bad
polyether have (high/low) tear strength
low
polyether are the (most/least) hydrophobic elastomers
least
polyethers are (easy/hard) to get good impressions in wet field and pour without bubbles
easy
polyether has 2 big disadvantages, they are?
cost and bitter taste
polyether are used for what?
crowns, bridges, inlays, onlays, dentures (so long as there are no undercuts)
What are 2 disinfectants that can be used for polyether impressions?
1:10 diluted bleach or 2% gluteraldehyde
polyether are (easy/hard) to remove from mouth
hard
polyethers (should/should not) be used in full arch impressions
should not
You need to wait __ min before pouring to allow polyethers to recover from flexing during removal
10
polyethers (can/ cannot) be properly used for subgingival region impressions
cannot
Rank the following from least to most contraction after 24 hours:

A. condensation silicone
B. polyether
C. addition silicone
D. polysulfide
addition silicone
polyether
polysulfide
condensation silicone