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57 Cards in this Set
- Front
- Back
DC stands for what?
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degree of conversion
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DC measures the % of what?
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the % of double bonds consumed
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Fill in the missing number. DC = (1-R) x ?
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100
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What is R in the DC formula?
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ratio of unreacted methacrylate groups before and after polymerization
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Higher DC = (higher, lower) strength and wear resistance
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higher
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DC falls in about what % range for most resin?
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50-70%
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What is the 'depth of cure' for a resin? What is the average depth of cure in mm?
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the depth at which light can reach to convery a resin from monomer to polymer form; 2-3mm
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If you increase light intensity, you (shorten, lengthen) the curing time OR you (increase, decrease) the depth of cure for a given exposure time
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shorten, increase
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Overtime in QTH units the light intensity (increases, decreases, stays the same)
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trick question, could be any of these! QTH systems are unpredctable overtime
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True or False, there are specific resins for anterior and posterior portions of the teeth, as well as universal resins for all teeth
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True.
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Nano-filled resins have filler particles that are < or = to ??? Nanometers
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100
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Composite resins are classified based on their average ___ size as well as the ___ of those.
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particle, distribution
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Traditional macro-filled resins have particles in the ???-??? Micrometer range
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8 to 12
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Small particle-filled (SPF) resins have particles in the ???-??? Micrometer range
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1 to 5
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hybrid resins have particles in the ???-??? Micrometer range
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.5 to 1.0
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microfilled resin has particle sizes in the ???-??? Micrometer range
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.04-.40
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Traditional composite is 70-80wt% (or 60-__vol%) ground amorphous silica and ___ filler, which are radio(opaque, lucent)
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70, quartz, lucent
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Properties of traditional composite are (better, worse) than unfilled acrylic resin
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better
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It is better for a resin to have (high, low) thermal expantion coefficient
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low
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Small particle-filled (SPF) resin have (more, less) inorganic filler than traditional resins
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more
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Small particle-filled (SPF) resin have heavy ___ containing ___ filler for radioOPACITY
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metal, glass
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What helps adjust viscosity in small particle-filled (SPF) resins?
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colloidal silica
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Which of the 4 resin types has the most superior physical and mechanical properties?
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small particle-filled
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Microfilled composite tends to have (high, low) viscosity due to the presence of ___ silica filter
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high, pylorytic
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Microfilled composite has a very (smooth, rough) finish
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smooth
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Microfilled composite contains (pre, post)polymerized filler
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pre
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Microfilled composite are (bad, good) in stress-bearing situations
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bad
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Hybrid resins are (better, worse) at stress bearing than microfilled
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better
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Microfilled resins have (good, bad) esthetic properties
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good
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Hybrid resins have (higher, lower) filler loading than small particle-filled resins
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lower
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Flowable composites are modified with reduced filler for more flow. They are typically less filled versions of what two resins?
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hybrid, small
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What type of resin is good where access is limited?
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flowable
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What type of resin is used as a "preventive resin resotration"
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flowable
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Flowable are (more, less) suseptible to wear and have (higher, lower) polymerization shrinkage than filled
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more, higher
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Flowable composites are used for the entire filling most of the time, T of F?
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False, you should only use it to line the cavity to get into spaces
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Posterior composite resins usually contains (more, less) filler particle of a (large, small) range
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more, smaller
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Direct posterior composites are (more, less) polishable than tradiational composites
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less
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Direct posterior composites have (high, low) rates of occlusal wear
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high
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Packable composite resin is (highly, not highly) filled
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highly
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packable composite resin (should, should not) be bonded to the tooth
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should
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Which composite resin has handling properties similar to amalgam?
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packable composite resin
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Packable composite resin has (low, high) shrinkage, (low, high) wearing rates, (low, high) depth of cure and are very (flacid, stiff)
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low, low, high (5mm), stiff
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Packable composite resin has (good, bad) interproximal contacts, (good, bad) adaptation to tooth, (high, low) viscocity, (easily, not easily) polishable
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bad, bad, high, not easily
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Indirect posterior composites are made in the (lab, dental office) and then cemented to the tooth
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lab
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Direct inlay resins is where the inlay is made in ___ and indirect, the inlay is made in ___
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patient's mouth, lab
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Veneer used to be made of (bis-GMA, PMMA) but are now made of (bis-GMA, PMMA) as the matrix
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PMMA, bis-GMA
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Veneers made with composite resin are (easy, difficult) to fabricate, but have (high, low) proportional limit
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easy, low
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What causes marginal leakage in composites?
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polymerization schrinkage at gingival margins; coefficient of thermal expansion
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Composites typically (do, do not) have water sorption and have (high, low) wear resistance, in general.
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do, low
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Which have better mechanical properties, amalgam or composites?
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amalgam (but youz will getz tha mercury poizioning lolz)
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True or False, composite bonds directly to the tooth
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False, does not
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True or False, composite is considered "technique-sensitive"
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TRUE.
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What is the ability of a chemical from the environment to mimic the effect of estrogen in the body?
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estrogenicity (drrrrr)
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Something from the environment that mimics estrogen is called a what?
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xenoestrogen
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True or False, bisphenol A (BPA) has been hypothesized as a xenoestrogen
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True.
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True or False, of all components of resin, methyl methacrylate is the only one that's never been shown to be an allerginistic
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False, it DOES have allergenistic properties
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Allergic contact dermititis is (dependent, independent) upon the dose of a material
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independent
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