Card Set Information
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
what are the two types of polymerization reactions?
addition and condensation
what is the most common polymerization reaction for dental materials?
what are thre three stages of addition polymerization?
what opens the bond between carbon atoms of the monomer?
what effect do free radicals have on the monomer?
opens bond between carbon atoms
what does the polymerization process produce
too high of heat can cause the monomer to vaporize what does this cause?
liquid monomer mixed with small polymer powder =??
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
the thermal expansion of acrylic resins are ____ that of composite resins
chmical cured acrylic resins are _____, _____, more ____ and less color stable
what keeps monomer of hte acrylic resin from evaporating?
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?
t/f acryic teeth are porcelain
FALSE-they are plastic
denture teeth can be _____, _____ or _____?
acrylic, plastic or porcelain
what is the initiator of acrylic resins?
what is the liquid of the acrylic resins?
chemical cure liquids have a _____ _____ as an activator
what is the activator of the chemical cure liquid acrylic resins?
what are the stages of polymerization reaction of acrylic resins? (know the right order)
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?
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
false- to OLD acrylic
where are soft term soft liners are usually placed where?
what are short term soft liners used for?
short term soft liners are applied to the primed denture base and reseated in pts mouth for what reason?
why do dentures become loose over time?
bony ridge resorbing
t/f porcelain dentures will cause more resorbing
true-it is harder
how are plastic (acrylic) teeth bonded to the acrylic base?
what type of attachment does porcelain teeth need?
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
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
pastics are used for maxillofacial prostheses by what type of dentist?
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?
what are used to establish proper dimension between upper and lower arches?
what type of brush should a denture be cleaned with
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
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