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39 Cards in this Set
- Front
- Back
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what 3 factors is designing fixed restorations dependent on?
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bio
mechanical esthetics |
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Intracoronal restorations get their retention from internal tooth surfaces, extracoronal restorations get their retention/resistance from...
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external tooth surface
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in extracoronal restorations..
the tooth supports the restoration the restoration supports the tooth whicch is true? |
BOTH
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All metal restorations have the advantage of ____, with a disadvantage of _____. They are used especially on _____. 3 choices are _____
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strength/durability
bad looks mandib 1st/2nd molars yellow or low gold or base metal |
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PFM has the advantage of _____. It is the most (common/popular) and its drawback is....
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metal strength w/ ceramic esthetics
common porcelain wear on opposing tooth |
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All ceramic is currently the most (popular/common) and has the advantage of _____. Its disadvantage is ______ and_____. The high strength ones are ______based, used for _____s.
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popular
esthetics strength wear on opposing tooth zirconium FPD |
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Retention is the resistance of displacement in the ____direction.
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insertion/removal
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resistance is the resistance of disaplacement in the _____direction.
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the non-insertion/removal path
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What degree taper is the ideal one?
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6
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What is the realistic goal for degree of taper?
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10(14) -20
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w/ increasing taper, retention_____.s
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decreases
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taper is greater on (ant/post) teeth
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post
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what are the 5 situations of greater taper?
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posterior
mandibular Multiple teeth tipped teeth B-L |
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more surface area of prep = _____ retention
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more
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Boxes and grooves in the prep are more helpful for (retention/resistance)
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resistance
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Boxes/grooves greatly help to resist rotaion in the ____direction
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M-D
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Boxes and grooves have the stipulation that they must be....
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on sound tooth
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A major factor of _____is the H/D ratio of the prep, which should be a minimum of ____.
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Resistance
.4 |
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4 things to do for resistance if you have short teeth
1. E.... 2. C.... 3. O.... 4. B.... |
extend sub-gingival
crown lengthen Ortho extrusion Box/groove |
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Metal Prep
Functional cusp... Non-functional cusp.... Axial.... Margin.... Margin design... |
funct - 1.5
non-funct - 1.0 axial - 1.0 margin - .5 margin - chamfer |
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funct - 1.5
non-funct - 1.0 axial - 1.0 margin - .5 margin - chamfer |
All metal OR metal ceramic w/ metal occlusal
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Metal ceramic - porcelain occlusal
coping thickness - porcelain thickness - reduction @ margin... |
.3-.5mm - coping thick
1.0 mm porcelain recution - 1.2-1.5mm @ margin |
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.3-.5mm - coping thick
1.0 mm porcelain recution - 1.2-1.5mm @ margin |
metal ceramic - porcelain occlusal
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metal ceramic - metal occlusal
Functional cusp... Non-functional cusp.... Axial.... Margin.... Margin design... |
funct - 1.5
non-funct - 1.0 axial - 1.0 margin - .5 margin - chamfer |
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All ceramic
Incisal - Axial - Margin - margin design |
1.5-2.0 mm incisal
1-1.5 axial 1-1.5 @ margin shoulder |
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1.5-2.0 mm incisal
1-1.5 axial 1-1.5 @ margin shoulder |
all ceramic
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What type of margin is this?
Easy to prepare less trauma infrequent used |
supragingival
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What type of margin is this?
more difficult trauma perio response |
subgingival
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Can a crown be placed to prevent caries?
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NO - must have other reasons in addition
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Chamfer is defined w/ ____mm, and is obtained via a ______bur.These are ideal for____.
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.5
round ended all metal |
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J-margin created by going-_____
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>1/2 diamter of bur
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Heavy chamfer is defined by ______.mm, created via _____. Ideal for_____
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1.2-1.5 mm
large round-end bur for PFM |
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Shoulder is best for ______.
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pfm/ceramics
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Advantage to knife-edge margin_____, disadvantage_____.
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easy
lack of bulk or overcontour |
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Which types (1-4) of gold are used for full coverage?
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3/4
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How much thickness of material should be on....
Occlusal functional? Occlusal non-funcitonal? Copings? |
1.5
1 .3-.5 |
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Occlusal contacts must be ____from finish lines
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1-1.5 mm away
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in a PFM, you need ___mm of porcelain to block out the metal
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.2mm
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Inadequate reduction for a PFM gives the _____
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headlight effect
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