final sg Flashcards
you want to make a CEREC crown for #31. which block would be best choice to mill the restoration from given its physical properties?
Sirona zirconia
A metal ceramic preparation on a mx incisor prepared with a path of insertion too lingual will have:
- monoplane facial reduction
- higher potential for pulp exposure
- thin incisal edge
what is NOT a provisional material?
lithium disilicate
typical thickness of opaque porcelain:
0.1-0.2 mm
you are staining a #8 PFM. hue is correct but chroma and value are high. What color (s) shoudl you use?
violet
for an all ceramic crown prep, the shoulder finish line should terminate
NOT 1 mm facial or lingual to or at proximal contact
After preparing a post space in distal root of 30 for size yellow post you notice that the post is not stable in BL or MD direction. the prep is 8 mm from readiographic apex and movemtn transcribes and arc of 3 mm, canal is straight what to do?>
increase post length by 2mm
a shade sample that matches under the operatory light, but not in natural daylight is an example of:
metamerism
what is not an acceptable finsish line for an all ceramic crown?
shoulder bevel
in the CEREC crown project, the mx antagonist image was occluded with the mn prep image using:
buccal scan
which of the following is the most common mode of post and core failure:
post loosening
the process of re-emission of radiant energy at a lower frequemcies htan it is absorbed is called:
fluorescence
sirona blocks come in the following translucencies:
opaque (O)
medium (M)
translucent (T)
which block is made of composite resin
paradigm MZ100
what cannot be directly milled with CEREC
PFM
when do you glaze a CEREC crown
- extrinsic colarant is desired
2. the restoration is milled from lithium disilicate
resin-bonded bridges shoudl be prepped in enamel to optimize bonding
auxiliary retention features such as grooves and rests are not required
T, F
the vita lumin shade guide has better coverage of the shade range of natural teeth than the vita 3D master shade guide
vita lumin is organize din 4 different lightness gorups (ABCD)
F, F
best tool to move a cusp to achieve tripodized oclusal contact on CEREC computer is
shape/anatomic/4 directional
human tooth shades are located primarily in which quadrant of the CIELAB color space?
+a, +b
which metal is most resistant to developing an oxidation layer for a given firing cycle
high noble
what i smost likely cause of as ignle poistive bubble on your die
poor syringe technique
in a doubel chored im pression technique a thinner cord is first inserted in the sulcus followed by a thicker cord on teh top: the top core is then removed and impression is made
T, T
the buccal path of insertion for a PFM crown for 8 as prepared in lab is
- tangential to facial HoC
2. halfway between the emrgence profile and the incisal 1/3
main benefit of using lentulo spiral is deliver of a void free fill of luting agent int o canal
it is importatn to run spriral in reverse
T, F
when shade selecting, squinting wil l help in seeing the VALUE of the teeth BECAUSE it restricts amoutn of ight enter eye and activated more rod cells which are photopic
T, reason F
