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multiple "monomer" chemically bonded together are _____ and ______ chain molecules
large and long
what is polymerization?
act of forming polymers using CARBON BOND
what kind of bond is polymerization
carbon bond
what are the two types of polymerization reactions?
addition and condensation
what is the most common polymerization reaction for dental materials?
addition polymerization
what are thre three stages of addition polymerization?
initiation
propagation
termination
what opens the bond between carbon atoms of the monomer?
free radicals
what effect do free radicals have on the monomer?
opens bond between carbon atoms
what does the polymerization process produce
HEAT
too high of heat can cause the monomer to vaporize what does this cause?
porosity
liquid monomer mixed with small polymer powder =??
polymerization
what does PMMA stand for?
poly methyl methacrylate
what is a polymerized resin called?
poly methyl methacrylate
dimensional change of acrylic resins are ______ shrinkage, __________ and ______ expansion
polymerization
watersorption
thermal expansion
the thermal expansion of acrylic resins are ____ that of composite resins
2x
chmical cured acrylic resins are _____, _____, more ____ and less color stable
WEAKER
SOFTER
POROUS
what keeps monomer of hte acrylic resin from evaporating?
pressure
how much pressure is needed for an acrylic resin in a pressure pot?
15-20 lbs of air
what three things does pressure do for an acrylic resin during processing?
denser acrylic
stronger acrylic
less porosity
t/f acryic teeth are porcelain
True
False
FALSE-they are plastic
denture teeth can be _____, _____ or _____?
acrylic, plastic or porcelain
what is the initiator of acrylic resins?
benzoyl peroxide
what is the liquid of the acrylic resins?
MMA-methylmethacrylate
chemical cure liquids have a _____ _____ as an activator
tertiary amine
what is the activator of the chemical cure liquid acrylic resins?
tertiary amine
what are the stages of polymerization reaction of acrylic resins? (know the right order)
sandy
stringy
dough
rubber
when does polyerization for chemical cured resins?
when liquid tertiary amine activates the benzoyl peroxide in the powder...then the free radicals develop
when do free radicals develop?
when polymerization occurs
where is polymerization shrinkage most evident in dentures?
palatal
what should soft liners be be cleaned with and why?
benzalkonium chloride to reduce yeasts
t/f long term soft liners do not form a good bond to new acrylic
True
False
false- to OLD acrylic
where are soft term soft liners are usually placed where?
chairside
what are short term soft liners used for?
tissue conditioners
short term soft liners are applied to the primed denture base and reseated in pts mouth for what reason?
border molding
why do dentures become loose over time?
bony ridge resorbing
t/f porcelain dentures will cause more resorbing
True
False
true-it is harder
how are plastic (acrylic) teeth bonded to the acrylic base?
Chemically
what type of attachment does porcelain teeth need?
mechanical
do plastic teeth wear opposing natural or artificial teeth or the restorations?
NO they do not!
t/f the porcelain teeth do not bond to denture acrylic they need mechanical retention
True
False
true dat
when are porcelain teeth contraindicated?
against natural teeth
why would pt have more discomfort or denture sores or accelerted ridge resportion with porcelain teeth?
transmits heavier occlusal forces
porcelain teeth are _____, _____ and _____ resistant
hard
esthetic
stain resistant
pastics are used for maxillofacial prostheses by what type of dentist?
prosthodontics
what is the process of chemical cured acrylic repair material?
sticky wax to hold pieces together
stone poured around prostheses
cut fracture line
wet and prime rougned with MONOMER
during a repair of a denture what are the pieces held together with?
sticky wax
what are used to establish proper dimension between upper and lower arches?
record bases
what type of brush should a denture be cleaned with
dneture brush
what type of cleaner should be used for at home denture care?
denture cleaner (liquid soap, mild hand soap)
how can the calculus be softened at home on the denture?
soak in 1:1 white VINEGAR and H2P (50-50)
t/f you should not use undiluted household bleach on denture
True
False
true
where will calculs accumulate on dentures?
same places as natural dentition-max molars and man incisors
in office how should dentures be cleaned?
place in zippered plastic bag with dneture cleaning solution and place in ultrasonic cleaner
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Author
cassiedh
ID
80354
Card Set
dental materials
Description
ch. 16
Updated
2011-04-18T16:02:34Z
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