ch 6 dental materials
Card Set Information
ch 6 dental materials
ch 6 dental materials
is quartz radiopaque?
no! remember...it doesnt end in IUM
what is not radiopaque, sometimes used as a filler for composites in the anterior teeth because it has good optical properties that enhance the color match to the tooth?
t/f composites are used in all classes of restorations from class I through class VI. what classifications are these?
true. G.V. Bliggity BLACK mans classifications
t/f composites are used for anterior, posterior, provisional restorations, core-buildups, fiber reinforced posts, onlays and bridges (lab fabricaated non-porcelain)
true i am too lazy to think otherwise
are anterior or posterior restorative concerns chosen for materials to match the color of teeth and achieve a high polish for non-bearing stress areas as a composite of choice?
what three types of composites are well suited for anterior resins for esthetic appearance and non-bearing stress areas?
microfills, microhybrids, nanohybrids
which type of composite should be considered for incisal edge restorations?
microhybrids or nanohybrids
why is a hybrid chosen over a packable composite for anterior resin choice?
hybrids can be polished to a smooth, shiny surface
t/f a shade should be taken after the rubber dam is on and so the teeth are isolated and able to see better
false! before they are isolated and before they are dehydrated
t/f you should check in different lights for a shade check in fluorescent, sunshine.
t/f a dry tooth before rubber dam isolation is when a shade should be matched
FALSE! a WET tooth
t/f a custom shade guide can be made with composite to be more accurate than a stock shade guide
true! who'da thunk that!
when can microhybrids and hybrids be a good choice as a composite resin?
for anterior (incisal), and posterior stress bearing areas
a posterior clV should be filled with ________ or ________ composite
flowable or microfilled (for flexibility!)
the cervical portion of the tooth is closest to the ______ color
incremental layers bond to each other _______ if no _________ occurs
chemically! (resin to resin)
the color of the body area (mid tooth) results of a light interacting with both ______ and ______
enamel and dentin
the incisal edges are "______" in color
posterior cusp tips are _____ than body or cervical areas
where should extra composite be stored?
in a refridgerator
what is the average shelf life of composite? ____-____ years
light-cure composites come in ________ compules or syringes
t/f compules are unidose applications of composite
true (although dentists are cheap and use them on several patients if they can!)
what is something to consider with syringe flowable?
watch for infection control
what should you do with a screw-type despensing composite material?
despense and cover to keep out of the light!
where should the flowable delivery tips be dispensed?
in the sharps container (what the....)
when is a mylar (clear plastic strip) used? (what classes of restorations)
CLIII or CLIV
where is a tofflemire used with a metal band?
on class II posterior teeth
can the metal be used for circumfrential or sectional when restoring a posterior CLII?
after curing the composite and taking off the tofflemire and metal band, what should be done next?
cure from the lingual and facial
what are 2 purposes of the wedge?
seal gingival margin
separate teeth-more thickness composite for tighter contacts
t/f the dentist can perform a mock up on the etched tooth to better match the composite to the tooth
FALSE! on an UNetched tooth
what is the hybrid zone or layer?
etched enamel/dentin plus bonding agents
resin to resin is a ______ bond
what is the air inhibited layer after polymerization?
the unpolymerized resin on the surface
contact with o2 _______ the cure due to the air inhibited layer
what should be done after sealants or composite is adjusted and polished?
wipe of with a 2x2 (gauze or cotton)
t/f dentin should be moist when bonded to resin
what happens if after the flowable is place, it gets contaminated? what needs to be done?
remove contaminant, re-etch 10-15 seconds
t/f use alcohol to wet composite instrument
do NOT! it will weaken the composite
why should you refrigerate composite to reduce sticking?
so it doesn't stick to the instrument. hey, maybe that works with frosting a cake and a knife!
why should liners or bases with eugenol not be used during composite restorations?
it inhibits the set of resin
how close should the light be when curing?
as close as possible without touching
thin layers should be cured in ___-___ seconds
thick, dar, distant (deep interproximal box) resins should be cured for ___ seconds
t/f scalpal blades can be used for small excess of resin for removal interproximally
what do surface sealers do?
reseal polymerization shrinkage margins
t/f an unfilled resin wears off in about a year, leaving an improperly polished surface
true again and again
what fils in surface porosities uncovered during finishing of a resin composite?
what needs to be done when using a surface sealer?
rinse, dry, etch enamel 15 seconds
thin layer unfilled resin placed and thinned with air
cure 20 seconds
what curing light has a fiber optic bundle in tip, and disposable cover
what is PAC and how long?
Plasma Arc Curing. 10 seconds
what is the most popular curing light?
LED (light emitting diode)
how often should a curing light be checked for proper light output?
t/f an operatory light can cause a premature set of composite before using the curing light
what can happen if you stare into the pretty blue light
say good by to your retina....you will have damage
t/f the curing light and composite emit heat which can lead to pulp damage
what are self cured, tooth colored, fl2 releasing, and bond to tooth WITHOUT addition of bonding agent?
t/f a glass ionomer needs to be biocompatible with tissues, tooth, and pulp
______ ____ binding maintain a seal better than composite
calcium ion (dont forget it!)
glass ionomers are fl2 releasing which means they ____and ___ fl2
absorb and release
the solubility of a glass ionomer is high in the first ___ hours (need varnish to cover them) they are sensitive to _______ uptake
when is the solubility set for fl2 releasing agents like glass ionomers?
after 24 hr set
t/f the thermal expansion of glass ionomer is greater than tooth
false! its the same...gotcha
is thermal protection of glass ionomers good?
where should glass ionomers NOT be used?
in stress bearing areas
which wears faster, GIC or composites?
which material gets rougher over time?
which material cannot be polished smooth?
which is more radiopaque, dentin or GIC?
which is more opaque, composites or GIC?
which is the most popular GIC?
what four reasons would you use a GIC for?
non-carious cervical lesions
anterior CLIII(no color problem area)
core build up with tooth support
can gic's be used for sealants
sure why not
what are liners and bases (vitrebond) for?
rebuild missing dentin
what is the lamination or sandwich technique?
interproximal box on root
what hybrid (resin-modified) ionomer component is added to improve physical properties?
HEMA (hydroxylethyl methacrylate)
resins are more stronger, polishable, more wear resistant, protect from exp to moisture if what is in the ionomer?
its a hybrid (resin-modified) ionomer
hybrid ionomers are fl2 releasing
just read it...there is not question or answer, just a fact. its bedtime
when is hybrid ionomer used?
in primary teeth( excessive wear ok too)
glass ionomers chemically bond to ________ in dentin and enamel
no not use _______ ______ with glass ionomer cements
what acid is used with GIC?
10% polyacrylic acid for 10 second to dentin
can GIC be readily shaped before set ?
how is the final shaping of GIC done?
with finishing burs or diamonds under h2o spray
t/f light cured hybrid GICs can be finished immediately
why should you stop manipulating when initial gel set starts of GIC?
loss of sheen
compomers are composite resins modified with _______
what contains fluoride but not fluoride releasing?!??!?! (it just has fl2 in the material) tricky tricky