surveyed crowns Flashcards

1
Q

when to make a surveyed crown

A
  • tooth extensively destroyed
  • reestablish occ plane
  • to create proper rests, contours, etc
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2
Q

when is the cast surveyed and design drawn relative to crown making

A

before crown made

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3
Q

It is essential that recontouring procedures be completed _______ crown (fixed restoration) procedures

A

t is essential that re-contouring procedures be completed
before crown (fixed restoration) procedures are begun

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4
Q

survey crown rest made of:

A

metal

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5
Q

areas engaging retentive clasp are made of

A

metal or porcelin

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6
Q

guide planes of surveyed crown made of

A

metal

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7
Q

when prepping tooth for crown what should be considered?

A

consider GP and rests: more reduction in area of rests for adequete bulk of material

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8
Q

impression for prepped crown tooth

A

req a full arch impression

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9
Q

casts for survey crown prep

A

full arch cast with a removable die is used

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10
Q

on lab work authorization form what should be indicated?
retainer/
 undercut?
 rest?
 material?
 other?

A

 Must indicate the RPD retainer selected (RPC, RPI,
etc) including height of contour details
 Indicate the desired location and amount (0.1”, 0.2”,
0.3”) undercut for retentive arm
 Indicate rest details (occlusal, cingulum, etc.)
 Indicate material for rest (metal)
 Indicate other metal ceramic requirements (shade,
occlusion, etc)

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11
Q

how are GP established for the surveyed crown

A

Guiding planes are created and refined using a wax knife in the vertical arm of a dental
surveyor.

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12
Q

surverying and adjustments for the crown

A

done on the wax pattern with the surveyor, can used carving instrument to establish proper contours

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13
Q

why would metal rests be more effective?

A

Dental ceramics are strong in compression, but weak in tension. If rest is permitted to
bind against the walls of a rest seat, wedging forces will result.
The accompanying tensile forces may result in failure of a
ceramic restoration

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14
Q

once crown is milled what should be done

A

crown should be surveyed

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