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26 Cards in this Set

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percolation of oral fluids and bacteria between the tooth and restoration
microleakage
state in which two surfaces are held together by interfacial forces which may consist of valence forces or interlocking forces or both
bonding
criteria for good adhesion
1. close contact bw adhesive and tooth structure
2. surface tension of adhesive must be lower than surface energy of enamel and dentin
3. adhesive must provide strong initial bond to resist stresses of polymerization shrinkage
consequences of microleakage
stained margins, postop sensitivity, recurrent caries
To attain better adhesive bonding, which should be lower, surface energy of enamel/dentin or surface tension of adhesive?
surface tension of adhesive - better wettability
total etch technique involves what?
utilization of acid to remove the dentin smear layer and to expose the dentinal surface
does one-step plus bind better to wet or dry dentin?
wet
what is "Uni-Etch" made of?
32% phosphoric acid with benzalkonium chloride (BAC)
what is the function of BAC?
it is an antimicrobial agent - creates a residual zone of bacterial inhibition up to 7mm
Why do we use Gluma desensitizer?
provide wet dentin surface
disfection/desensitizing effects
no negative effects on bond strength of dentin bonding agents to tooth structure
What are the components of One-Step Plus?
Bephenyl dimethacrylate
Hydroxyethyl methacrylate
Acetone
Glass Frit (filler particles)
a combination of two or more chemically different materials that have a distinct interface separating them
composite
a material in which inorganic filler material has been added to an organic resin
dental restorative composite
most common resin matrix used in dental composites
bis-GMA
what causes the composite to be radiopaque on a radiograph?
addition of barium
what are the components of a two-paste form composite system?
initiator - benzoyl peroxide
accelerator - amine compound
materials which do not begin the polymerization process until exposed to an external light source
photo-cured resin composites
what is the depth of cure limit for photo-cured resin composites?
1-1.5 mm
what is considered a potential disadvantage when using self-cured systems?
amine discoloration
what do light-cured composites have to avoid amine discoloration?
photochemical initiator system, consisting of a diketone and a reducing agent
what are the components of dental composite restorative materials?
matrix, filler particles and a coupling agent
what are the 4 categories of dental composites?
large particle macrofilled, microfilled, small particle macrofilled, hybrids
New classification system of hybrid materials and sizes
macrofillers: 10-100 microns
midifillers: 1-10 microns
minifillers: 0.1-1.0 microns
microfillers: 0.01-0.1 microns
special-purpose, light-cured composites intended especially for cervical restorations
flowable hybrid composites
what characteristic of flowable composites makes them distinguishable?
low modulus of elasticity
physical characteristics of resin composites
1. polymerization shrinkage
2. high coefficient of thermal expansion
3. wear resistance
4.increased amount of filler particles: improves translucency, reduces coefficient of thermal expansion, resuces polymerization shrinkage, makes material more resistant to wear