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t/f with admix you use less condensation pressure because it has little resistance
True
False
FALSE! spherical!!!!
which establishes a contact easier admix or spherical?
ADMIX
what must be done to get a contact with spherical?
Heavy wedging
t/f admix uses more mercury
True
False
true
t/f spherical has high early compressive strength (1 to 24 hours)
True
False
true
t/f spherical uses 10% more mercury
True
False
FALSE, 10% LESS
which has a slower set admix or spherical..think about it, I am going to make you think...pause pause pause
admix-it has a longer working time
t/f spherical has a faster set time?
True
False
true dat mhm
at 24 hours both admixed and spherical ____ copper amalgams shrink slightly whereas ____ copper amalgmas expand
HIGH
low
____ is the mixing of powder and mercury
triturating
what is the appearance of a properly triturated capsule?
SATIN appearance
what is the appearance of an UNDER triturated amalgam
dry crumbly and sets too quickly=weak filling
t/f an under triturated amalgam results in a weak filling
True
False
true
if the amalgam is dry crumbly and sets quickly is it:
A. properly triturated
B. over triturated
C. under triturated
C. under triturated
what is the appearnace of an OVER triturated amalgam
too wet, sets too quckly and is a weak filling
t/f amalgam that is too wet and sets quickly is under triturated
True
False
false OVER triturated
why should you overfilll a cavity prep with amalgam?
to allow enough material to carve contours and remove excess mercury that is forced to the surface by condensation
t/f carving amalgam after set starts will damage the margins
True
False
true
how long must the pt wait to eat on an amalgam restoration?
8 hours
what % of strength does the amalgam have at 8 hours?
80%
what % of strength is the amalgam at after 1 hour of set up?
50%
what % of strenght is the amalgam after 24 hours of set up?
100% DING DING DING all done!
when should an amalgam be polished?
24 hours after placement
t/f polishing should not be done earlier than 24 hours after placement
True
False
true
____, _____ copper alloys need no polishing
Modern, High
t/f Modern, high copper alloys are dull and need to be polished to shine
True
False
FALSE, the are shiny and need no polishing
How is polishing of an amalgam done? (hint what must you use 2 things...man I am so thirsty think I will go drink me a little WATER)
H20
Light Touch
what three things retain amalgams in preparation?
parallel walls
under cut walls
irregularities in tooth wall
what is the process if amalgams are bonded into the preparation?
etched iwth phosphoric acid
one or two bonding resins placed
Amalgam applied to WET chemical cured resin
t/f when amalgams are bonded in the amalgam is condensed onto a dry chemical cured resin
True
False
FALSE...Wet chemical cured resin (go get Jade she is good at getting Analey wet she can help here..wait...oops)
what must be used when placing an amalgam to help minimize swallowing amalgam particlees or inhaling released amalgam vapors? 2
Rubber Dam
high volume evacuation
what is the OSHA acceptable mercury exposure level?
.0005 mg/m3 for 40 hr work week
t/f most dental offices are close to exceeding OSHA acceptable mercury exposure levels
True
False
FALSE! most are far BELOW recommened levels
what degree is mercury vapors released?
80 degrees C
how is scrap mercury stored?
under water in airtight container
t/f you operatories should have no carpet or tiled floors for mercury safety
True
False
True true
T/F mercury free amalgam is no longer used in USA
True
False
True..but why? read the paragraph it will tell you!
Author
cassiedh
ID
70351
Card Set
Dental Materials
Description
dental amalgams STARTS AT HANDLING CHARACTERISTICS
Updated
2011-03-23T18:31:32Z
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