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