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23 Fixed Prosth > 9/12 - Surveyed Crowns > Flashcards

9/12 - Surveyed Crowns Flashcards

1
Q

why is it called “surveyed” crowns

A

because we use the surveyor to make these crowns

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2
Q

when does one choose to fabricate a crown to serve as RPD abutment

A
  1. enamel modification
  2. dentin exposure
  3. restore clinical crown, occlusal, plane, provide rests, etc.
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3
Q

surveyed crown is created when correction of unacceptable tooth contours cannot be achieved thru ___

A

enamel modification

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4
Q

surveyed crown is created when correction of unacceptable tooth contours can lead to dentin exposure making and abutment tooth susceptible to ___ and ___

A

sensitivity and caries

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5
Q

can you resposition the occlusal plane with surveyed crown? example?

A

YES - e.g., supraerupted teeth

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6
Q

surveyed crowns can be used to provide proper rests, particulary with what?

A

anterior teeth and retentive undercuts

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7
Q

kratochvil vs. krol

A

Kratochvil:
- length of tooth guide planes
- 2-3 mm tissue coverage high polish
Krol
- guide planes: 2-3 mm
- 2-3 mm tissue coverage

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8
Q

what is the greatest point of convexity while surveyed

A

HOC

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9
Q

where are retainers placed

A

2/3rds above HOC or 1/3 below HOC

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10
Q

what burs to use for cingulum rests?

A

inverted diamon, 876, or 1172

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11
Q

where are cingulum rests placed

A

anterior teeth

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12
Q

you must be careful to not do what when creating cingulum rest

A

careful of creating undercut

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13
Q

T/F: cingulum should be touched when creating cingulum rest

A

FALSE! do not touch cingulum to maintain positivity

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14
Q

cingulum rests are concave from ___ view and convex from ___

A

mesial/distal; lingual

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15
Q

cingulum rests should be low or high on the tooth from the mesial/distal view?

A

low

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16
Q

when is surveyed crown needed

A
  1. broken-down tooth is critical abutment tooth for PRDP
  2. abutment tooth cannot be altered to provide desired contours (support, stability, retention)
  3. occlusal plane discrepancy needs to be corrected
17
Q

sequence of creating partial

A
  1. diagnosis
  2. design
  3. fixed restoration
  4. removable restoration
18
Q

what is done during appointment 1

A

diagnostic impressions

19
Q

what is done between appt 1 and 2

A
  • draw design
  • prep cast
  • custom tray
20
Q

what is done during appt 2

A
  • tooth prep
  • final impression
  • index accuracy
21
Q

what is done between appt 2 and 3

A
  • master cast readied
  • work authorization
22
Q

what is done during appointment 3

A

framework try-in

23
Q

what is done during appt 3 and 4

A

record base fabrication

24
Q

what is done during apointment 4

A
  • records
  • altered cast
  • tooth selection
25
Q

what is done btwn appt 4 and 5

A

articulate and set teeth

26
Q

what is done during appointment 5

A

tooth tryy in

27
Q

what is done during appointment 5 and 6

A

esthetic wax up

28
Q

what is done during appointment 6

A

checks (24 hour and 1 week)

29
Q

how should diagnostic casts be articulated? what is mostly used downstairs?

A

centric relation or max intercuspation

mostly use MI in clinic

30
Q

surveyed crown fabrications (this is long)

A
  1. articulate diagnostic casts
  2. surveye diagnostic wax up with appropriate design features
  3. duplicate diagnostic wax up for stone cast
  4. preparation guides fabricated
  5. prepare and provisionalize abutment
  6. final full arch impression
  7. records accordingly
  8. survey full contoured wax up with design principles
  9. wax cut back of metal or metal ceramic
  10. cast, fit to die, metal try in to verify fit of casting, occlusion if applciable
  11. ceramic bisque survery try in
  12. glaze and final cementation
  13. refinement of other PRDP abutments and final impression
  14. finish PRDP in traditional manner
31
Q

do you send the whole pindex to lab

A

yes and they send the whole thing back to you when they make the crown for you to check

aPpARrantLY

32
Q

advantages of using survey crown

A
  • easier to do guide planes, rests, etc.
  • hard to see angle and undercuts on natural teeth
33
Q

surveyed crown path of insertion should match what

A

insertion path of RPD (for the most part)

34
Q

you should be cautious of using surveyed crowns on what teeth? why?

A
  1. endodontically treated teeth
  2. teeth w/ post restorations

because will likely lose teeth

35
Q

extra reduction is needed in areas of rests, clasps, or guide planes for NATURAL TEETH or SURVEYED CROWNSS?

A

surveyed crown

36
Q

what is the panograph used with

A

articulator for records

guy in picture looked like –▭–▭–

37
Q

do you have to get wax up signed off

A

yes

38
Q

if patient has existing RDP and survey crown breaks, what do you do? what is easier

A
  • attempt to make a new survey crown
  • EASIER: make new RDP after making new crown
39
Q

what are the ways you can attempt to fix survey crown with an existing RDP

A
  1. make impression w/ partial in place, syringe around tooth and make impression, partial remains in impression. make another impression without partial. both impressions with RPD and without are sent to lab. adjust and cement crown and hope it fits

OR

  1. place GC pattern impression coping directly made on tooth over prep and inbetween the partial. send the pattern resin to lab and they include this into their wax up. this requires a lot of adjustments and sometimes doesn’t work

23 Fixed Prosth (21 decks)

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