quiz questions Flashcards
which type of margin is NOT recommended on the root of teeth?
-shoulder (chamfer, knife edge, feather are ok)
How much reduction is recommended on the facial of anterior teeth?
1.2 mm
when should a putty matrix be made?
before you start the preparation
how much occlusal reduction is needed for a CVC prep on #30?
1.2-1.5 mm
centric relation
-the mandible is in a physiologic position
the most (or one of the most) important retention factor in a preparation is…
having parallel walls, for anterior teeth, most of the forces are in the BL direction, so these are the walls that need to be parallel
the ideal crown to root ratio for an abutment is:
2/3
for a five unit bridge, what type of connector?
non-ridig connector
does the literature clearly state the longevity of crowns and fpds?
no
The facial surface of a maxillary anterior tooth prepared for a metal-ceramic crown must be prepared in 2 planes. If only one plane is reduced
opaque porcelain may show through, labial surface may be overcontoured, pulp may be encroached upon
Four mechanisms have been described to explain the bond between the ceramic veneer and the metal substructure of a metal-ceramic restoration. The mechanism of chemical bonding is
– the formation of an oxide layer on the metal by firing the metal coping in an oxidizing atmosphere
The occlusal contacts of a metal-ceramic restoration should occur on
-and the porcelain-metal junction placed _ from the occlusal contacts
- metal whenever possible
- 1 mm
Ceramic is contraindicated on which teeth?
molars
What is the strongest ceramic material?
Zirconia
What is the strongest ceramic material?
CAD/CAM
