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23 Implants > 9/19 - Prosthodontic Procedures: Implant Impressions > Flashcards

9/19 - Prosthodontic Procedures: Implant Impressions Flashcards

1
Q

how many tabs are on the implant interface and pick-up interface of self-guiding impression copings

A

7 tabs

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2
Q

what is the purpose of implant impressions

A
  1. capture 3D position of implant in relation to adjacent teeth and soft tissue
  2. fabrication of implant restoration
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3
Q

impression copings are specific to what

A

diameter of implant

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4
Q

what are the different types of impression copings

A

transfer (closed tray) and pick-up (open tray)

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5
Q

are transfer/closed tray impression copings fixture level impressions

A

YES

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6
Q

what impression coping remains in mouth when impression material is removed

A

transfer (closed-tray)

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7
Q

what impression coping needs to be removed, attached to replica, and is repositioned into impression

A

transfer (closed tray)

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8
Q

how do transfer/closed tray impression copings introduce error

A
  1. hyperocclusion
  2. misfit of abutment/crown
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9
Q

indications for transfer/closed tray impression copings

A
  1. individual implant restorations
  2. limited vertical opening/access
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10
Q

are pick-up/open tray impression copings fixture level impressions

A

YES

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11
Q

what impression requires a hole made in tray to access and unscrew guide pin prior to removal of impression

A

pick-up (open tray)

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12
Q

what impression coping is removed from mouth with impression

A

pick-up (open tray)

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13
Q

which impression tray has improved accuracy

A

pick-up (open tray)

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14
Q

indications for pick-up (open tray)

A
  1. custom impression coping
  2. multiple implants
  3. full arch implant cases
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15
Q

examples of implant cases that indicate need for pick-up (open tray)

A
  1. splinted restorations/implant FDPs
  2. converging/diverging implants
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16
Q

you should request implant impression components ___ week(s) prior to appointment

A

at least one week

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17
Q

T/F: throat packs are dumb and aren’t needed when creating implant impressions

A

FALSE! need

18
Q

is it okay if you work slowly when removing healing abutments and then taking impressions?

A

NO! don’t want to let the tissue collapse

19
Q

what do you do with CHX when creating implant impressions

A
  1. irrigate sulcus w/ mono jet syringe
  2. cleanse healing abutments
20
Q

how do you know when closed tray impression coping is in?

A

feel it ‘drop in’ and engage slots/tabs

21
Q

do you hand tighten or use hand piece to place closed tray impression copings

A

hand tighten

22
Q

when taking radiographs of impression coping, what must be present in pic

A
  1. confirmation of components seated
  2. clear, sharp threads
  3. x-ray beam parallel to implant (BW)
  4. do not need apex, just need connection and crestal bone
23
Q

which is acceptable, which is unacceptable?

A

top = unacceptable
bottom = acceptable

24
Q

what do you place in the hex portion of implant impressions

A

red rope wax in hex

25
Q

light body PVS goes where? medium body PVS goes where?

A

light body turquoise -> gingival
medium body purple -> custom tray

26
Q

once you remove impression copings and place healing abutments back on implants by hand tightening in patient, can the patient be dismissed?

A

YES

27
Q

T/F: healing abutments should be tightened with a hand piece

A

FALSE! HAND TIGHTEN ONLY

28
Q

how should implant impression closed tray be repositioned into impression

A

spline should be in line

29
Q

what happens if spline is not aligned in closed tray

A

30 degree misfit/shift of abutment and crown will not sit

30
Q

what happens if you don’t seat impression coping fully back into impression

A

hyperocclusion of implant restoration

31
Q

what is the purpose of custom impression copings

A
  1. make an impresion coping that replicates cervical contoours
  2. communicates with lab tech (final custom abutment contours, soft tissue support simlar to provisional)
32
Q

what impression coping is used for custom impression copings

A

pick-up (open-tray)

33
Q

when creating custom impression coping, do you place the PVS around provisional in patient’s mouth or on cast?

A

on cast

34
Q

once PVS is set around custom impression coping, what do you do?

A

unscrew abutment and leave PVS material in then place open tray impression coping with hex driver

35
Q

once open tray impression coping is placed back into the hard rock cast without the provisional, what do you do? why

A

space is filled with flowable composite

so when placed in mouth, it puts pressure on the tissue the same way provisional did and tissue doesn’t collapse

36
Q

after composite is placed into provisional PVS impression, what do you do?

A

cure! make sure composite is not bonded to adjacent teeth

37
Q

what can you place in your custom tray to help guide where you drill your hole for open tray coping

A

red wax

38
Q

is adhesive needed in custom tray

A

yes

39
Q

do you unscrew the open tray impression coping BEFORE or AFTER removing custom tray?

A

BEFORE REMOVAL

40
Q

once replicas are placed back onto the impression coping in custom tray w/ PVS, what do you place around the copings? what is this for

A

GINGIVAL MASK (resilient in nature) placed around interface of coping and impression material

this is so that when you pour in stone, the two aren’t locked together

41
Q

what stone do you use for implant master cast

A

HARD STONE

42
Q

before you remove the custom tray from the hard stone, what must you do?

A

remove anterior pin w/ open tray with hex

23 Implants (9 decks)

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