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88 Cards in this Set
- Front
- Back
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What is the component forming the main structure of the set material?
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base
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What is a component of the reaction that speeds up the setting reaction and is similar to the catalyst?
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accelerator
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What is a component that initiates the setting reaction, but usually does not become part of the final product?
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catalyst
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What is the lightly cross-linked material having elastic behavior after setting?
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elastomer
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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?
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monophase
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What is the time-dependent pseudoplastic behavior of materials characterized by the gradual decrease of viscosity under a constant applied shear rate?
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Thixotropic
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What is the characteristic behavior or a material that behaves intermediate to an elastic solid (spring) and a viscous fluid (dashpot)
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viscoelastic behavior
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ADA/ANSI spec #__ divides elastomeric impression materials into 3 types based on what?
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19, selected elastic properties and dimensional change of set material
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There are four classes in each of the three types of elastomeric materials... these 4 types are based on what?
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viscosity
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The alternate classification of elastomeric impression material divides them into 4 types (instead of 3) based on what?
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chemical composition
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Elastomeric impression materials are (chain/cross)linked polymeric (1/2/3/4/5) paste materials that set be (reversible/irreversible) chemical reaction
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cross, 2, irreversible
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Elastomers are used to obtain (very/not very) accurate impressions for indirectly-fabricated restorations
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very
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Elastomers (do/do not) require tray adhesive
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do
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Polymerization shrinkage of elastomers should be (towards/away from) the tray
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towards
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Elastomers are removed using (slow/rapid) removal
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rapid
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What type of metal is used in a polysulfide?
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Titanium (TiO2)
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Which component of the polysulfide contains lead dioxide?
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catalyst
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The polymer (for polysulfide) is contained in the:
A white base paste B brown reactor/accelerator paste |
A. white base paste
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What are the retarders in polysulfide?
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oleic/stearic acid
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Groups of _H in base polymer are cross-linked with lead dioxide
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S
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lead dioxide is a(n) (oxidizing/reducing) agent
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oxidizing
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lead dioxide is what color?
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brown
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In the setting reaction of Polysulfide, the polysulfide is created. What else is formed?
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Water
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Polymer is hydro(phobic/philic) in nature (in polysulfide)
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hydrophobic
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polysulfide must be left to set for how many minutes?
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10
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What is the process called that forms disulfide bonds and lengthens chains in the polysulfide setting reaction?
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vulcanization
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polysulfide has the (highest/lowest) tear resistance of ALL impression material
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highest
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polysulfide should be removed (quickly/slowly)
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slowly (NOTE: all others removed quickly up to this point!)
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polysulfide has the (quickest/slowest) elastic strain recovery and (most/least) permanent deformation after compressive strain
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slowest, most
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polysulfide should be poured within __ min but is better if poured immediately
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30
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polysulfide has what % setting shrinkage?
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0.3-0.4%
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True or False, polysulfide requires a custom tray
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True
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What happens if lead dioxide gets on clothing?
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stains it
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polysulfide is used for what?
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preparing crowns, bridges, inlays, onlays, and denture fabrication
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How should you disinfect polysulfide?
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soak in 2% gluteraldehyde for 10-15 min
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What is the reinforcing agent added to silicone impression materials?
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silica (drrrrr...)
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addition silicone impression materials forms (volatile/non-volatile) by products
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non-volatile
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Early versions of silicone impression materials released what element?
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hydrogen
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What is the base in condensation silicone impression materials?
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alpha-omega-hydroxy-terminated polydimethyl siloxane with colloidal silica or metal oxide filler (what did I just type...)
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What is the accelerator in silicone impression materials?
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tri or tetra functional alkyl silicates and stannous or tin-octoate
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In silicone impression materials, silicone is created along with what other byproduct?
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ethanol
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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?
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putty-wash
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True or False, custom trays must be used with the putty-wash technique
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False, stock trays are fine
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(condensation/addition) silicones release volatile by-products
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condensation
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condensation silicone products have what % shrinkage?
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0.03-0.06%
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condensation silicone impression materials are hydro(phobic/philic) and need a (dry/wet) environment
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hydrophobic, dry
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condensation silicone impression materials are (easy/hard) to pour without getting bubbles
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hard
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condensation silicone impression materials need to be poured within __ min but after the __ has evaporated
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30, ethanol
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condensation silicone impression materials have (good/poor) working time and (high/low) tear strength
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good, low
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(Condensation/Addition) silicone impression materials are more commonly used
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addition
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condensation silicone impression materials have (good/poor) dimensional stability
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poor
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What are two names for addition silicone materials?
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polyvinyl soiloxane, vinyl polysiloxane
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The following describes the (base/catalyst) of addition silicone materials:
polymethyl hydrogen siloxane and reinforcing filler |
base
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The following describes the (base/catalyst) of addition silicone materials:
divinyl polydimethyl siloxane, reinforcing filler and chloroplantinic acid |
catalyst
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What volatile byproduct is formed with addition silicone materials?
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None! sometimes H2 can be released but this is technically not a by-product
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addition silicone materials set when there is addition polymerization with cross-linking of ___ silicone groups to hydride groups
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vinyl
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What can be added to absorb H2 so that pouring can begin sooner?
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Pt/Pd (either of these metals)
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What is the shrinkage % of addition silicone materials?
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0.05-0.16%
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True or False, addition silicone materials can only be used once
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False, can be poured repeatedly
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True or False, no custom tray is needed with addition silicone materials
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True
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addition silicone materials are hyrdo(phobic/philic)
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hydrophobic
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What is added to some addition silicone materials to make it more hydrophilic?
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surfactant
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You should wait __min before pouring in addition silicone materials to permit release of H2
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60min (aka 1 hour)
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What component of latex gloves can INHIBIT the setting of addition silicone materials?
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sulfur
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addition silicone materials have the (best/worst) dimensional stability
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best
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addition silicone materials is (cheap/expensive)
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expensive
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addition silicone materials are used for what?
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crowns, bridges, inlays, onlays, dentures
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How do you disinfect addition silicone materials?
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gluteraldehyde for 10-15 min
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What type of silicone are used as bite registration materials?
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addition silicones
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This is an example of what side group?
-C-O-C- |
ether
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addition silicone materials as bite registration materials are dispensed how?
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automixing cartridge or with a two sided bite tray
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The following describes the (base/accelerator) of polyether
polyether pre-polymer, colloidal silica filler, glycolether or phthalate plasticizer |
base
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The following describes the (base/accelerator) of polyether
sulfonate ester initiator, imine catalyst |
accelerator
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polyether has a (high/low) modulus of elasticity
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high
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polyether shrinks about __% on curing
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0.15%
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Working and setting times are (long/short) with polyether
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short
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polyether are (good/bad) for gaggers but (good/bad) for multiple preparations
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good, bad
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polyether have (high/low) tear strength
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low
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polyether are the (most/least) hydrophobic elastomers
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least
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polyethers are (easy/hard) to get good impressions in wet field and pour without bubbles
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easy
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polyether has 2 big disadvantages, they are?
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cost and bitter taste
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polyether are used for what?
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crowns, bridges, inlays, onlays, dentures (so long as there are no undercuts)
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What are 2 disinfectants that can be used for polyether impressions?
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1:10 diluted bleach or 2% gluteraldehyde
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polyether are (easy/hard) to remove from mouth
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hard
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polyethers (should/should not) be used in full arch impressions
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should not
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You need to wait __ min before pouring to allow polyethers to recover from flexing during removal
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10
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polyethers (can/ cannot) be properly used for subgingival region impressions
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cannot
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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 |
