ch 6 dental materials
Card Set Information
ch 6 dental materials
dental materials ch 6
what are the most common filler ("feel her") particles in composite? (3)
silicates, quartz, or glass (kiss my "glass" you "sili" "quarter" of a man!)
what is added to composite for radiopacity to show up on an x-ray?
.....IUM ......IUM! THINK ......IUM! barium, strontium, lithium (also zirconium or yttrium)
10-100 um (marshmellows) represent:
1-10 um (jelly beans) represents _______ composite
midifill (my "mid" section "feels" like jelly beans)
.1-1 um (red hots) represents _______ composite
minifill (you are so mini, your pants are a size .1-1 and that is red hot!)
.01-.1 um (nerds) represents _______ composite
.001um (sugar) represents _______ composite
glass ionomer cement (hybrid ionomer), and
are _________ - ________ esthetic materials.
________ is a mixture of two or more materials with properties superior to any single component
composite resin is mainly composed of an _______ resin (polymer) matrix and ________ (silica) filler particles
organic resin (polymer)
inorganic resin (silica)
what adheres the silica and polymers to the matrix?
silane coupling agent
what is the size range of hybrid composite?
.6-3.5 um (jelly beans and nerds)
nanofilled micro hybrid is a blend of _____, _____, and nanofill particles (jelly beans, nerds, and sugar)
micro, midi, and nanofill
what composite is popular due to high polishability and ease of handling, but requires tooth support?
name to reasons why hybrids are popular.
strength and beauty
nanofills ______ polish ability but add ___ compressive strength
INCREASE polish but add NO compressive strength
nanofills ____ surface area and _____ strength to resin or composite
a light cured (_______) mix of composites is _____ porus than self cured (_______)
light cured (UNmixed)
less ("Light Less")
self cured (Mixed) (I'll just MIX it mySELF)
composite contains polish with ___ ____ or diamond polishing paste, not coarse ______
what helps reduce shrinkage when the resin matrix polymerizes or sets?
filler particles! (if you "fill" his "particle" he wont shrink)
how would you detect a composite overhang?
with an explorer
porcelain is a direct or indirect restorative material? which one?
INdirect (sent to the lab)
type of material chosen depends on what four factors?
damage to tooth
stresses placed on restoration
what is the most commonly used resin for the matrix of composites?
what is the most commonly used filler?
the higher the filler content, the _________ the restoration and the more _____ _______
what are two important factors for the durability of the composite resin?
size of filler particles
ratio or weight of the filler to the matrix
composition of composite is _____ resin (polymer) matrix, inorganic ______ filler particles, ________ coupling agent
INorganic SILICA filler particles
SILANE coupling agent
what does the silane coupling agent do?
adheres particles to the matrix
provides stronger bond between filler and resin
T/F composite composition includes an initiator, accelerator, and pigment
T/F filler particles help control handling characteristics
filler particles make organic resin _______, more wear _______, ______ handling characteristics, and reduce polymerization _______
what three things are composite wear related to?
filler particle size
amount of filler in resin
amount of resin between filler
is it better to have smaller or larger particles of composite on the surface?
higher filler content = ____ and _____ wear resistant
does smaller or larger particles of filler have more surface area?
what does a coupling agent do?
provides stronger bond between organic fillers and resin matrix
what allows organic matrix and inorganic filler to adhere?
good adhesion of both organic matrix and inorganic filler is necessary and it minimizes the loss of _______ ________, as well as reducing _____
are pigments organic or inorganic?
what approximate basic colors of teeth?
________ join together to create ________, usually hydrogen for composite polymerization
chemical reaction ( ____ + ____)
base plus catalyst
which filler particles are more easily plucked (get pulled) large or small?
which size of particles are not as easily plucked and cause fewer voids that contribute to wear?
T/F the smaller the particles, the smoother the surface of the composite after finishing and polishing
BASE = ______ + composite
catalyst = ______ + composite
composite resins can be cured by _____ or _____ activation or a combination of the two (___)
chemical or light
during polymerization for both chemical or light, an _____ molecule forms _____ _____
what are free radicals?
highly charged molecules that have unpaired electrons
what is the activator for polymerization? (2)
chemical or light
the monomers ( _________; e.g. bis GMA) have carbon to carbon double bond functional groups
what do free radicals do to carbon to carbon bonds?
break on of the double bonds to form a single bond and another free radical
free radicals during polymerization can cause the same reaction (break C=C bond) with another monomer to add to the _____ chain (called addition polymerization)
when monomers link together into chains, the volume of the resin ________, so the net result is ________
polymer to polymer is a " cross-link " to form _______ bonds
what is stronger and stiffer material? (what to what)
polymer to polymer
benzoyl peroxide is an ________ base
tertiary amine is an ________
what is the most common type of polymerization of composite?
what is diketone?
blue light wavelength activator
if composite is too thick will the bottom cure all the way?
what mm of increments should composite be placed in?
less than or equal to 2mm
with a chemical cure (self-cure) how long does the operator have to place the restoration before it becomes too stiff?
what will happen if the self-cure material initial set occurs and the material is manipulated?
properties of the restoration will be degraded
t/f two pastes must be manually mixed, air can be incorporated into the material causing voids or porosity in the restoration