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23 Fixed Prosth > 6/5 - Facebow/Protrusive Registration, #19 PVS Impression Boxing and Pour, #19 Interocclusal Bite Registration, 291-298, 307-320, 40-41, 63-70 > Flashcards

6/5 - Facebow/Protrusive Registration, #19 PVS Impression Boxing and Pour, #19 Interocclusal Bite Registration, 291-298, 307-320, 40-41, 63-70 Flashcards

1
Q

when condylar angle is too SHALLOW, the __ lift out of record. when the inclination is too STEEP, the ___ lift out of record.

A

anterior; posterior

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2
Q

what are the components of Hanau Spring-Bow

A
  1. facebow with orbital pointer
  2. bite fork
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3
Q

the empty bite fork clamp faces what side?

A

right (operator’s view) or patient’s left

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4
Q

the orbital pointer to be rotated where to on the patient?

A

infraorbital notch (orbitale)

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5
Q

before the facebow is attached to the articulator, what should the condylar inclination and bennett angle be set to?

A

condylar is 30 degrees
bennet is 30 degrees and beginning of ppt but says 15 at end of ppt idk

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6
Q

do we need to index the cast prior to mounting maxillary cast

A

YES

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7
Q

T/F: you should articulate the mandibular casst by wristulation

A

TRUE

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8
Q

what type of record should we use to set condylar inclination?

A

protrusive interocclusal record

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9
Q

what shape should the pink wax be when preparing it to take a protrusive registration record

A

trapezoid

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10
Q

how many thickness of baseplate wax for protrusive registration

A

two thicknesses

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11
Q

how many mm of protrusive movement

A

5-7 mm

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12
Q

T/F: you should captuure every tooth when recording protrusive registration

A

FALSE. you don’t have to capture it all

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13
Q

do you place the baseplate wax on the maxillary or mandibular arch when recording protrusiv registrationi

A

MANDIBULAR!

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14
Q

about how many mm of indentation do you need on baseplate for protrusive record

A

~1 mm

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15
Q

should the stem of the bite fork be to the patient’s left or right?

A

LEFT

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16
Q

since we are taking facebow records on the manikin, where should you place the ear bow?

A

15 mm below the division of the top half and bottom half of manikin

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17
Q

since we are taking facebow records on manikin, where should the orbital pointer be placed?

A

superior to ala of nose (infraorbital notch)

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18
Q

which end of the incisal pin should be used for fixed work

A

rounded end (pencil)

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19
Q

what supplies needed for FCC #19 impression

A
  1. custom tray
  2. adhesive
  3. Light body
  4. PVS
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20
Q

before putting adhesive on custom tray, what must you do?

A

try the tray in pt mouth

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21
Q

how much adhesive do you need for custom tray

A

as much that covers the dappen dish

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22
Q

how should you cover the custom tray with adhesive

A

coat the inside and just outside the tray

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23
Q

prior to taking PVS impression, what must you do

A

check patient’s mouth for undercuts before the impression

24
Q

what areas should you block out with rope wax? why?

A

all anterior interproximals and all potential undercuts. this is because you don’t want the PVS to lock in

25
Q

work time and final sett for aquasil monophase

A

work time: 1 min, 10 seconds
final set: 5 minutes

26
Q

prior to placing PVS into mouth or tray, should you express a little on a paper towel to make sure everything is working correctly?

A

YES

27
Q

how much PVS should you put in custom tray?

A

fill it to the top

28
Q

where should you place light body inside the pt mouth?

A

syringe around prepped teeth and thru the central grooves and incisal edges of remaining teeth

29
Q

how far should you push the custom tray in the pt mouth?

A

until tissue stops hit teeth

30
Q

what should you do with the excess material that flows out of custom tray when taking impression? is there a difference between manikin and live patient?

A

lap up some of the excess over the edge of the tray with cement spatula. in a live patient, you would just border mold the cheek against the tray

31
Q

when is the PVS material set

A

hard rubber feel

32
Q

can tray break when taking impression of typodont?

A

YES! so BE CAREFUL! use buffalo knife to help wedge it out

33
Q

what MUST be present when examining your impression after taking typodont out? what must not be present

A

MARGINS. bubbles on margin must bot be present

34
Q

after capturing impression, what must you do in pt mouth?

A

remove excess impression material between teeth (make sure to lightly block out these areas also)

35
Q

when cutting around the impression and preparing it to be boxed, what should you use to cut?

A

Bard-Parker with #25 blade or buffalo knife

36
Q

what should be flowed around the outside the skirt of the tooth? why?

A

baseplate wax

this allows for easier die trimming at later stage

37
Q

T/F: flow baseplate wax INSIDE the margins of impression?

A

FALSE! place on outside of margins

38
Q

how many times can you reuse a PVS impression?

A

3-4 times, but only if baseplate wax was placed around to prevent tearing of margin

39
Q

order of waxes used to box impression

A
  1. stick wax around custom tray
  2. rope wax on sticky wax (sear to tray on both sides)
  3. boxing wax on rope wax (sear to rope wax on both sides)
40
Q

what type of stone to use for #19 PVS impression

A

hardrock stone (2 bags)

41
Q

what should you place on custom tray prior to pouring stone

A

Smoothex to help stone flow

42
Q

what does it mean to wristulate cast

A

put in most interdigitated position

43
Q

when creating regisil interocclusal bite registration, should we wristulate cast?

A

YES

44
Q

how should patient bite when taking bite registration

A

max intercuspation (tell pt to bite on back teeth)

45
Q

T/F: bite registration should include/touch adjacent teeth

A

FALSE! only need a small dollop on the one tooth working on. don’t want it to touch adjacent teeth

46
Q

describe the trim of an interocclusal bite registration

A
  1. shows only cusp tips
  2. no tissue contact
  3. able to see that registration seats completely
47
Q

impressions for a cast restoration should meet what requirements

A
  1. exact duplication of prepared teeth
  2. other teeth and tissue adjacent to the prepared tooth must be accurately reproduced
  3. must be free of bubbles
48
Q

it has been reported that impression sen to laboratories have more than __% of the preparation finish line not discernible

A

50%

49
Q

the choice of what type of impression material to use it based on what?

A

personal preference, ease of manipulation, and economics

50
Q

is accuracy a consideration in choice amongst materials? why?

A

no because there is not clinically significant difference

51
Q

what are examples of impression materials

A
  1. reversible hydrocolloid
  2. polysulfide
  3. condensation silicone
  4. polyvinyl siloxane (PVS)
  5. polyether
52
Q

a material that exhibits the property of becoming more fluid when the shear rate is increased by deforming or disturbing is called ___

A

thixotropic

53
Q

custom tray should be painted with adhesive at least __ minutes before impression is to be made

A

15 minutes

54
Q

how long to hold tray in place when using light body and medium or heavy body material

A

7 minutes from start of mixing

55
Q

casts that are to be used for fabrication of restorations for small portion of occlusion are attached in articulator in position of ___

A

max intercuspation

56
Q

how thick should max intercuspation record be

A

4 mm

23 Fixed Prosth (21 decks)

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