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29 Cards in this Set
- Front
- Back
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cutting and grinding are _____processes, whereas polishing is a ____process.
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MACROSCOPIC - cut and grind
MICRO - polishing |
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Brittle materials have what types of deformation to failure?
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elastic only
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ductile materials have what types of deformation to failure?
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elastic then inelastic
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as the number of flutes increases, it influences...
depth of cut/flue rate of material removal tool stability vibration all of the above |
all of the aobve
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Chips in ductile material are common with what speed?
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low/medium
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T or F
Using low speed causes ductile material to behave more like brittle material. |
F
using high or ultra |
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Burs have a ____rake angle, and with wear they become _____, and the clearance angle
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negative
more negative clearance decreases |
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When there is wear...
rake angle increases rake angle decreases no change |
decreases(more negative)
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Abrasive tools are most effective for
hard/brittle materials soft/ductile materials both |
hard/brittle materials
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worn tools cause...
a. change in geo (rake angle more neg) b. change in cutting mechanism c. reduced efficiency d. temperature rise |
ALL
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Which ceramics are made by presisng?
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Empress 1 or 2
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More crystals of a ceramic does what 2 things?
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stronger
more opaque |
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What,when added to a ceramic, makes it stronger and more opaque(has a positive corrleation)
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crystals
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Aluminus porcelain relation to empress?
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stronger and more opaque
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what ceramic has the highest fracture toughness?
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zirconia
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Zirconia
empress alumina porcelain which is good for posterior/long bridges? |
zirconia
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PFM is to core as Ceramic is to
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coping
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2 goals of luting?
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retention and sealing
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What type of cement is put on cold/chilled glas slab?
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Zinc Phosphate
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retention and sealing are the 2 goals of?
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luting
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Poly Carbox Cement (PCC) setitng reaction creates what type of reaction product?
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zn poly acrylate gel
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zn poly acrylate gel is a reaction produce of the setting reaction of what?
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Poly carbox cement (PCC)
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Setting reaction for zinc phosphate leads to...
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tertiary zn phosphate
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how is aliumina porcelain made?
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scanning procera
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scanning procera is how you make...
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alumina porcelain
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types of tissue scaffolds
salt leached freeform hydrogel nanofiber freezedried ceramic metal |
all
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what is false about ceramic scaffolds?
typically used for tissue engineering osteoconductive enhance osteogenesis high modulus like bone are of CALCIUM PHOSPHATE CEMENT (CPC) sets fto form hyddroxyapatite mixes with porogen yields pores |
all true
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which is false of a static culture?
Can develop necrotic core if cells density is too high due to inadequate transport of waste/nutrient put in plastic dish of static growht medium works for immature tissue/shorter times ger around necrotic by using bioreactor |
all tru
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what is true of bioreactors?
Enhance perfusion of scaffold generate larger tissue constructs higher cell density all of the above |
all
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