all ceramic crowns Flashcards
ACC or MCC has better esthetics?
ACC
rank from strongest to weakest:
glass-ceramic
porcelain/mostly glassy
glass/crystalline ceramic composite
dense sintered polycrystalline ceramics
strongest = dense sintered polycrystalline ceramics
glass/crystalline ceramic compoiste
glass-ceramic
weakest = porcelain (mostly glassy)
how to increase strength of ceramics
increase crystalline content, decrease glassy phase
increase thickness
draw back to increasing crystalline content of ceramics
opacity
draw back to increasing thickness of ceramics
take away more tooth
Y-TZP
strongest ceramic
zenostar
eMax is what type of ceramic
lithium disilicate glass-ceramic
Empress is what type of ceramic
leucite unforced glass ceramic
rank from strongest to weakest: eMax, empress, zenostar
zenostar
emax
empress
what type of ceramic should you use for premolars and molars
non silica based
(dense sintered polycrystalline ceramics, glass/crystalline ceramic composite)
zirconia!
what type of ceramic should you use for anteriors
silica based
glass ceramic
primarily glass
EMAX!!
three techniques for crown fabrication
full contour monolithic
minimal cutback
full cutback with opaque core
method of crown fabrication depends on….
translucency and strength of ceramic material ordered
do we mill or press emax
press
for minimal cutback, what sort of translucency is required
at least moderate translucency
for eMax does translucency effect strength
no
larger shade changes require…..
more opacity
tell lab desired shade and stump shade
full contour crown fabrication requires what translucency of material
must be translucent
what material is used for full contour crown fabrication
emax I think
which material shrinks by 20% when you bake it
zirconia
anterior teeth crown fabrication technique
minimal cutback zirconia
add veneer porcelain for incisal details
how to remove material from zirconia crowns
dialite zr kit (diamonds)
how to add contacts to zirconia crowns
add low fusion porcelain
what type of crowns can you add contact to
Zr and LDS
do you need silane treatment for non silica based crowns
no
what type of cement for non silica based crowns
phosphate esters based or RMGI cement
how to prepare surface of silica based crowns before cementing
HF etch surface
apply silane
what type of cement for silica based crowns
resin based
TE or SE
how to minimize surface flaws in LDS crowns
polish after adjustments
etch internal surface
DONT GRIND INTERNAL SURFACE
how to minimize surface flaws in Zr crowns
polish after adjustments
clean internal surface (dont etch)
DO NOT GRING INTERNAL SURFACE
how to minimize stress on crowns
increase thickness
caution with bruxing for any ceramic
