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Tit for Tat, D for Mat

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lunalovegood's version from 2016-12-10 16:14

Section 1

Question Answer
1 softinlays (YS <140)
2 mediuminlays & onlays (YS 140-200)
3 hardcrowns (YS 201-340)
4 EXTRA hardRPD & long span bridges (YS >341)
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Section 2

Question Answer
Easily burnished1
Pontics2, 3
Inlays subject to stress2
Short FPD3
Thin 3/4 crown3
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Section 3

Question Answer
Titanium alloy = >___% 85% titanium
High noble = >___% gold with >___% gold + platinum group40% gold, 60% gold + platinum
Noble = >___% gold + platinum25%
Predominately base = <___% gold + platinum25%
Platinum, palladium, rhodium, iridium, osmium, rutheniumPlatinum group metals
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Section 4

Question Answer
Resist tarnish + corrosion, ductility, high specific gravity, colorgold
Resist corrosion, hardens, raises melting ptplatinum
Resist corrosion in Ag alloys, strength, white color, less $$$ than platinumpalladium
Grain size refinementIridium & Ruthenium
Hardens, whitens, less $$$, CORRODESSilver
Oxygen scavenger, improves castabilityZinc
Resist corrosion, hardens, strength, reddish color, age hardeningCopper (increased dislocation pile ups by distorting gold structure)
Decrease thermal expansion coefficientMolybdenum & Tungsten
Increase potential of metal surfaces to form oxidesIron, Indium, Tin
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Section 5

Question Answer
Porcelain to metal bondoxide layer
Oxide layer should be...thin and light color
Co-efficient of thermal expansion you want ___ bigger.metal > porcelain, w/n 0.5
Co-efficient of thermal expansion within ___ 0.5
Lower nobility =more corrosion
Multiple phases =more corrosion
Soldering = <____ Celsius<425 degrees Celsius (no diffusion)
Brazing = > ____ Celsius> 425 degrees Celsius (no diffusion)
Soft solder = ___ systemeutectic
Hard solder = ____ systemnon-eutectic (solid solution)
Finenessgold content in solder
Caratdescribes metal onto which solder is to be used
Why no Pt or Pd in solder?increase melting temperature
High fineness = ___ tensile str, ___ flow, ___ corrosion, ____ brittlenesslow, low, low, low
Ideal gap size0.1-0.3mm (business card)
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