Week 13 Flashcards
what are the factors that affect the selection of material
- destruction of tooth structure
- esthetics
- plaque control
- financial considerations
- retention
what is the 50% rule
if 50% of the original tooth is gone, would want to do a full crown restoration
order of resistance of removal force of 4 different types of restorations from lowest to highest
MOD onlay < 3/4 crown < 7/8 crown < all-metal crown
what are intracoronal restorations?
inside crown, inside tooth
what can be used for intracoronal restorations?
- glass ionomer
- composite resin
- simple amalgam
- complex amalgam
- metal inlay, ceramic inlay, MOD onlay
what type of glass ionomer do we use at creighton
Fuji IX
what is a semi permanent material
glass ionomer
what is a “jack-of-all-trades” material
glass ionomer
composite resin is commonly used to restore what type of lesions?
Class III and Class V (on anterior teeth per book)
Gradoville says also could be on Class I
what should you be careful not to do with composite resin?
be careful not to over-use it
simple amalgam vs complex amalgam
simple amalgam - restoration placed in MOD preparation on a molar
complex amalgam - restoration replaces missing cusp on a molar
metal inlays are synonymous with what?
gold inlays
what are the types of extracoronal restorations
- partial coverage crowns
- all-metal crown (FCC)
- metal-ceramic crown (MCC)
- all ceramic crown (ACC)
- ceramic veneer (laminate)
give an example of a partial coverage crown
a 3/4 crown seated on a molar
give example of FCC
all metal crown on a maxillary second molar
give an example of MCC
metal ceramic crown on a maxillary premolar
which molar must always used metal crowns? which must always be ceramic?
2nd molar always metal
1st can be ceramic
what restoration has the largest longevity rating
intracoronal - glass ionomer
which restorations have the smallest longevity ratings
- intracoronal - simple amalgam
- intracoronal - MOD onlay
- exracoronal - partial coverage crown
- extracoronal - all-metal crown
what type of retention do metal and ceramic inlays have
minimal retention
what type of retention do MOD onlays, and partial coverage crowns have
moderate retention
what type of retention do all-metal crowns, all-ceramic crowns, and metal-ceramic crowns have?
good retention
what type of retention do ceramic veneers have
adequate retention
how many degrees does an 856 diamond have
3.5 degrees
what provides space for adequate bulk of restorative material (metal/porcelain) in an area of heavy occlusal contact
functional cusp bevel
what also used to be referred to as porcelain-fused-to-metal (PFM), consists of a ceramic layer bonded to a thin cast metal coping that fits over prepared tooth?
MCC - metal ceramic crown
what combines the strength and accurate fit of metal with the esthetics of a ceramic crown
MCC - metal ceramic crown
what is the tooth preparation for an MCC
combination of all metal and all ceramic:
shoulder on facial, and chamfer on lingual
what is expected on anterior tooth MCC prep
- uniform reduction of 1.2 mm over entire facial surface
- two-planed facial reduction blended together
what is the area of only metal lingual on the tooth
metal coping
what material is located anteriorly on a MCC crown
ceramic
what material is located anteriorly on a MCC crown
ceramic
on posterior teeth, MCCs are best used on what teeth
maxillary first molars and premolar
can also be indicated for mandibular premolars
we should limit the use of MCC porcelain occlusal on which posterior teeth
2nd molars
what material is more abrasive than gold
glazed porcelain
what should you used for posterior MCC occlusal reduction
diamond 856 or 169
what should you use for posterior MCC functional cusp bevel
diamond 856 orr 169
what should you used for depth orientation grooves
coarse-grit flat-end tapered diamond (847)
for facial reduction for MCC prep what bur
847 coarse-grit flat-end tapered diamond
for proximal axial reduction what bur to use MCC prep
888 needle diamond
what type of MCC usage is getting reduced due to the advent of quality all-ceramic restorations
anterior MCC
when creating a putty matrix, the index should contact what?
the labial and lingual surfaces of the teeth on either side of the tooth to be prepared
when creating putty matrix for anterior MCC, how should you cut the index?
cut into a labial and lingual half
for anterior MCC, the lingual reduction must preserve what?
a retentive plane
for anterior MCC, the lingual clearance must be what?
at least 0.7 mm
when doing a lingual reduction for anterior MCC< what type of bur should you use?
coarse-grit football shaped diamond 379
how much occlusal clearance on an MCC prep?
~1.5 mm
do we want occlusal reduction or clearance for MCC prep?
CLEARANCE!!!
what should the margin of the shoulder on an MCC preparation be?
1 mm shoulder on facial
what should the margin of the chamfer on an MCC prep be?
0.5 mm chamfer on lingual
for a MCC posterior prep, what should the wall height be?
at least 3-4 mm tall
should you do a chamfer all the way around or shoulder all the way around first when doing MCC prep?
CHAMFER
what type of restoration can use an FPD abutment?
- partial coverage crown
- all metal crown
- metal ceramic crown
what type of restoration can use RFD abutment
- simple amalgam
- complex amalgam
- metal inlay
- metal onlay
- partial coverage crown
- all metal crown
- metal ceramic crown
