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63 Cards in this Set

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When all of the teeth in the dental arch are to be replaced it is called ________. When some, but not all, teeth in the arch are to be replaced, it is called _________.
complete dentures

partial dentures
Ideal denture bases have several criteria including: (high/low) strength, (high/low) density, (easy/difficult) to manipulate, (good/moderate/poor) thermal conductivity, (difficult/easy) to repair and (good/poor) resistance to absorption of oral fluid.
High
Low
Easy
Moderate
Easy
Good
Name the four different types of dentures.
Removable Dentures
Fixed Dentures
Fixed/removable Dentures
Implanted-supported Dentures
What are the four methods of denture base processing?
Heat-activated resins
Chemically-activated resins
Light-activated resins
Microwave energy-activated resins
What are the two techniques that fall under heat-activated resins and which one is the more commonly used method?
Injection-molding technique

Compression-molding technique (MORE COMMONLY USED METHOD)
___________ technique and ___________ technique are both examples of denture base processing methods used with chemically-activated resins.
Compression-molding

fluid resin
The _________ technique uses heat-activated resin like PMMA or thermoplastic polystyrene resin.
injection-molding
The injection-molding technique may provide slightly improved ____________ and a reduced risk of ___________.
clinical accuracy

monomer vapor inhalation
What are the stages of polymer-monomer interaction?
1) Sandy
2) Stringy
3) Doughlike
4) Rubbery or elastic
5) Stiff
The microwave energy-activated resins use specially-formulated _______ and a ______ in conventional microwave.
PMMA resin

nonmetallic flask
Microwave energy-activated resins have the advantage of _______ and comparable ______________.
speed

physical properties
In chemically-activated denture base resins, _______ is the activator.
dimethyl-para-toluidine in the liquid
____________ is not as complete as in heat-activated resins which can cause it to be a tissue _________ and can cause it to act like a _____, resulting in what?
Degree of polymerization
irritant
plasticizer
will result in decreased transverse strength
What is the degree of polymerization of chemically-activated denture base resins?
3-5%
What are the uses of chemically-activated denture base resins?
Denture Repair
Provisional Crowns
Custom Trays
Chemically-activated denture base resins have (less/more) polymerization shrinkage (< ____ % linear) and (superior/inferior) color-stability than heat-activated resins.
less
(<1% linear)
inferior
Fluid resin technique uses _____-activated, (high/low) viscosity resin.
chemically
low
What are the advantages of the fluid resin technique?
Better soft tissue adaptation
Lesser chance of damage to denture base or teeth
Simpler procedure
Cheaper
What are the disadvantages of the fluid resin technique?
Shifted teeth
Air entrapment
Poor teeth-base bond
Technique sensitivity
Inferior physical properties
Light-activated denture base resin is a composite with a matrix of ______, ________ and _______, ________, and ______ as an initiator
UDMA
microfine silica
high Mw acrylic resin monomers
acrylic filler beads
camphoroquinone (initiator)
Processing stresses occur due to what?
During the formation of the polymer

Thermal changes

Improper mixing

Poorly controlled heating
Porosities occur due to:
Uncontrolled heating

Inadequate mixing of powder and liquid

Insufficient material
High water absorption occurs due to:
Expansion compensates for the shrinkage

Saturation in 17 days

By the process of diffusion
Polymerization shrinkage of polymerized resin in approximately _____ % linear shrinkage ( _____ % vol shrinkage) whereas shrinkage of monomer is ____ % vol shrinkage.
0.5%

6%

21%
Diluted Clorox solution is NOT recommended for what?
metal partial dentures
Suggestions to patients in reference to care of dentures should be:

(do/do not) use abrasive dentrifices or hot water to clean dentures

(do/do not) use a soft brush and/or denture cleansers

(do/do not) keep dentures moist when not in mouth
do NOT

DO

DO
____ % of all denture teeth are made of resin.
60%
______ absorb some of the stresses produced by mastication.
Soft liners
Denture adhesives are also called what?
Denture adherents
Denture adhesives are typically sold as ______, _______, _______ or ______ that are used as temporary measure to hold dentures firmly in place.
creams
powders
wafers
strips
What are the components of denture adhesives?
polymer, petroleum, mineral oil, silica, polyethylene oxide, and/or trace amounts of zinc
________ can result due to chronic use of excess amounts of denture adhesives with trace amounts of zinc and may cause deleterious effects.
Hyperzincemia
When you know that your patient is using denture adhesives, it is important that you caution that patient to do what?
Use SMALL amounts of the denture adhesive
Chemically-activated soft liner liquid contains ___ - ____% plasticizers like _________. Plasticizers prevent and ________ over time.
60-80%

dibutyl phthalate

polymer chain entanglement

leach out
Chemically-activated soft liners are considered (long/short) term while heat-activated soft liners are considered (long/short) term.
SHORT (chemically activated)

LONG (heat-activated)
Concerning heat-activated soft liners, __________ are the most durable and adhesion to denture base is (poor/good).
silicone rubbers

POOR
Heat-activated soft liners are acrylic resin polymers where the liquid contains _______ and ________.
acrylic monomer
plasticizers
Resin denture teeth are (easier/more difficult) to adjust, have (less/more) impact resistance, (less/more) ductility, and (less/more) thermal shock resistance than porcelain denture teeth.
EASIER
MORE
MORE
MORE

(Apparently resin denture teeth are the caddys of the denture teeth world!)
Porcelain denture teeth have (better/worse) dimensional stability and (decreased/increased) wear resistance than resin teeth.
BETTER
INCREASED
Porcelain teeth can cause wear of ______ and _______.
opposing enamel
gold surfaces
The wear that porcelain teeth can produce to gold surfaces is specifically due to _________.
abrasive damage
Glass transition temperature is the temperature which __________ increases abruptly, indicating what?
THERMAL EXPANSION COEFFICIENT increases indicating INCREASED MOLECULAR MOBILITY.
Glass transition temperature is characteristic of what?
glassy structures

(DUH, DUDE!)
What are used at temps above their glass transition temperature values and what is the purpose of going beyond this temp?
MAXILLOFACIAL PROSTHETIC - AND IMPRESSION-MATERIALS

For the purpose of FLEXIBILTIY
What is used at temps below their glass transition temperature values and what is the purpose of not reaching this temp?
RESTORATIVE COMPOSITE RESINS

For the purpose of being solid at oral temperatures and when subjected to hot foods/fluids
Resin denture teeth are:

(weak/tough)

(soft/hard)

(low/high) abrasion resistance

(lower/higher) degree of cross-linking than denture base resin

(chemically/mechanically) bond to denture base resin
TOUGH
SOFT
LOW
HIGHER
CHEMICALLY
Residual wax on resin denture teeth during processing can cause what?
Teeth to be dislodged from denture base
What is dough-forming time?
Time required for resin matrix to reach dough-like stage should be LESS THAN 40 MINUTES (according to ADA Spec No. 12)
Though the dough forming time requires that the resin mix reach the dough-like stage within no more than 40 minutes, typically it takes < _____ minutes for most products.
LESS THAN 10 MINUTES
Working time is the time that a resin mix remains in the ___________ stage and should be at least ______ minutes.
dough-like
at least 5 minutes
Working time is affected by what and what can you do to prevent these effects?
ambient temperature which can be avoided by storing in an airtight container in refrigerator and permitted to return to room temp before use
What is the activator in the polymerization procedure?
HEAT
During the polymerization procedure, if ________ is heated above 60 C it will decompose.
benzoyl peroxide
During the polymerization procedure, ______ are released and ______ are converted to _______.
FREE RADICALS

MONOMERS

POLYMERS
What are the powder components of heat-activated denture base resins?
prepolymerized spheres of PMMA

< 0.1% benzoyl peroxide initiator

TiO2 opacifier
What are the liquid components of heat-activated denture base resins?
Unpolymerized methyl methacrylate

<0.006% hydroquinone inhibitor

1-2 vol % glycol dimethacrylate for crosslinking
What component of heat-activated denture base resins is for crosslinking and is it apart of the powder or liquid?
1-2 vol % gycol dimethacrylate

LIQUID
What component of heat-activated denture base resins is the inhibitor and is it apart of the powder or liquid?
<0.006% hydroquinone

LIQUID
What component of the heat-activated denture base resins is that initiator and is it apart of the powder or liquid?
<0.1% benzoyl peroxide

POWDER
What component of heat-activated denture base resins is the opacifier and is it in the powder or liquid?
TiO2

POWDER
For heat-activated denture base resins the polymerization cycles are:

____°C for 9 hours OR

____°C for 2 hours, then _____°C for 1 hour OR

____°C for 90 minutes, the ____°C for 1 hour FOLLOWED BY:

allowing resin and plaster/stone to do what?
74°C

74°C, 100 °C

65°C, 100 °C

allowed to reach a stable temperature
During the temperature rise of the polymerization of heat-activated denture base resin, the process is (exothermic/endothermic) AND above ____°C the process is accelerated.
EXOTHERMIC

70°C
During polymerization of heat-activated denture base resin temperature rise, monomer boils at _____ °C and in thick portions of denture base, temperature of resin may rise above boiling causing what?
100.8°C

POROSITIES