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71 Cards in this Set

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What's the term for a removable prosthesis intended to replace teeth and associated oral structures
denture
When all the teeth in an arch are replaced, it's a (complete/partial) denture
complete
When only some of the teeth in the arch are replaced, it's a (complete/partial) denture
partial
The part of the denture that do not replicate teeth is called the denture __
base
T of F, dentures should be low density
T
T or F, dentures should absorb oral fluid
F
What are the 4 methods of denture base processing?
heat-activated
chemically-activated
light-activated
microwave energy-activated
What are the two types of heat activated denture base resins and which is MOST common?
compression-molding (most common)
injection-molding
What are the two types of chemically-activated resins
compression-molding
fluid resin
The powder in heat-activated denture base resin contains:

prepolymerized spheres of ___

< 0.1% __ peroxide initiator

TiO2 as a ____
PMMA, benzoyl, opacifier
The following are the liquid components of heat-activated denture base resin:

(pre/un)polymerized methyl methacrylate

< 0.00_% hydroquinone inhibitor

1-2 vol% glycol dimethacrylate for __-linking
un, 6, cross
What is the polymer:monomer ratio by volume?
3:1
polymer and monomer interact for form dough-like stage in less than how many minutes?
10
Name the 5 phases of consistency that the polymer/monomer mix goes through
sandy
stringy
dough-like
rubbery or elastic
stiff
The time required for resin mix to reach dough-like stage should be LESS than __ min according to ADA spec # __. But most products are less than __ min
40, 12, 10
The working time is defined as the time that a resin mix remains in the __ stage. This should be at least 5 min
dough-like
T or F, working time is unaffected by ambient temperature
F
Resin dough should be stored in a (cold/warm) environment and allowed to return to room temp before working
cold
What is the activator in heat-activated resins?
heat
Above __C, benzoyl peroxide will decompose
60
T or F, heat creates free radicals and converts monomer to polymer
T
The following are the 3 polymerization cycles:

__C for 9 hrs

74C for __ hrs, then 100C for __ hr

65C for 90 min, then __C for 1 hr
74

2, 1

100
resin is a (good/poor) thermal conductor
poor
The resin curing process by heat-activation is (endo/exo)thermic, above __C the process is accelerated
exo, 70
Monomer in heat-activated resins boils at what temp?
100.8C
If temp raises above boiling in heat-activated denture base resins, what can form?
porosities
T or F, injection-molding reduce the risk of monomer vapor inhalation
T
T or F, injection-molding technique uses heat-activated resin like PMMA
T
Microwave energy-activated uses specially formulated PMAA resin and a (true/non)metallic flask in a (special/conventional) microwave
non, conventional
Microwave energy-activated denture base resins have the advantage of ___ and have comparable physical properties
speed
What is the activator in chemically-activated denture base resin?
dimethyl-para-toluidine
Degree of polymerization is (more/less) complete in chemically than heat-activated
less
How much unreacted monomer is left over in chemically activated resin and what can it do?
3-5%

tissue irritant
act like plasticizer, resulting in lower transverse strength
Chemically-activated denture base resins can be used for what 3 purposes?
denture repair
provisional crown
custom tray
Chemically-activated have (more/less) polymerization shrinkage
less
which has better color-stability, heat or chemically activated?
heat
What technique uses chemically-activated low viscosity resin?
fluid resin technique
The following are properties of fluid resin technique:

(better/worse) soft tissue adaptation
(less/more) chance to damage denture base or teeth
(harder/easier) procedure
(more/less) expensive
better, less, easier, less
Which of these is NOT a disadvantage of the fluid resin technique?

shifted teeth
air entrapment
poor teeth-base bond
technique insensitive
inferior physical properties
technique insensitive (should be SENSITIVE)
What is the matrix in light-activated resin?
UDMA, microfine silica and high Mw acrylic resin monomers, acrylic filler beads, and camphoroquinone
camphoroquinone serves what purpose in light-activated resins
initiator
T or F, special finishing and polishing is required with light-activated resin
false, conventional is fine
Polymerization shrinkage of polymerized resin is 0._% linear (6% vol shrinkage) whereas the monomer is __% vol shrinkage
5, 21
There is a slide that lists some things and I'm not clear on the significance or what he was going for so they're just listed here as the answer
high water absorption:
-by process of diffusion
-saturation in 17 days
-expansion compensates for shrinkage

porosities:
-uncontrolled heating
-inadequate mixing of powder and liquid
-insufficient material

Processing stress
-during formation of polymer
-due to thermal changes
-improper mixing
-poorly controlled heating
Denture base resins have:

(high/low) strength
(high/low) flexibility
(high/low) brittleness
(high/low) hardness
(high/low) fatigue strength
(high/low) thermal conductivity
low
high
high
low
high
low
Which is NOT recommended for dentures:

keep moist when not in mouth
don't use abrasion or heat to clean
use soft toothbrush
use clorox for metal partials
use clorox for metal partials
They now have a CAD/CAM like technology for dentures
COOL!
What % of denture teeth are made of resin?
60
resin teeth are:

tough, soft, and have (low/high) abrasion resistance
low
T or F, denture teeth have HIGHER degree of crosslinking than denture base resin
True
denture teeth bond to denture base resin via (physical/chemical) bonds
chemical
T or F, residual wax on resin teeth during processing will cause teeth to dislodge from denture base
T
Compared to porcelain teeth, denture teeth:

(easier/harder) to adjust
(more/less) impact resistance
(more/less) ductility
(more/less) resistance to thermal shock
easier, more, more, more
Compared to resin teeth, porcelain teeth:

(worse/better) dimensional stability
(increased/decreased) wear resistance
better, increased
T or F, porcelain teeth can cause damage to opposing enamel and gold surfaces
T
What absorbs some stresses produced by mastication?
soft liners
chemically-activated soft liners are considered (long/short) term
short
What are the components of chemically-activated soft liners?
poly methyl methacrylate
poly ethyl methacrylate

Liquid had 60-80% plasticizers like dibutyl phthalate
What is the plasticizer in chemically-activated soft liners and what does it do?
dibutyl phthalate
prevent polymer chain entanglement

PROBLEM: they leach out over time!
Silicone rubbers are (least/most) durable heat-activated soft liners
most
What is in the liquid of acrylic resin polymers of heat-activated soft liners?
acrylic monomer and plasticizers
Silicone rubber heat-activated soft liners have (poor/good) adhesion to denture base
poor
What is the definition for the temp at which thermal expansion coefficient increases abruptly, indicating increased molecular mobility?
Tg (actually the g is a subscript here)
Tg is also known as the __ __ temperature
glass transition
Maxillofacial prosthetic and impression materials are used at temps (above/below) their Tg values so that they are (flexible/rigid)
above, flexible
Restorative resin composites are used at temps (above/below) their Tg so they will be solid at oral temp and when subjected to hot food and fluid
below
Denture adhesives are also called denture ___ and are sold in what 4 forms?
adherents
creams, powder, wafer, strips
denture adherents are meant to be (permanent/temporary)
temporary
Denture adhesives contain polymer, ___, mineral oil, silica, polyethylene __ and trace amounts of what metal?
petroleum, oxide, zinc
Why should patients use small amounts of denture adherents?
They can cause hyperzincemia due to chronic use of excessive amounts and may have deleterious effects
What 4 materials can be used as maxillofacial prosthetics?
latexes, silicone rubber, polyurethane, vinyl plastisols