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