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Removable Spring > 5. Impressions > Flashcards

5. Impressions Flashcards

1
Q

What is the ideal thickness of alginate in a tray

A

5mm

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2
Q

What is the ideal thickness of elastomeric impression material in a tray

A

3mm

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3
Q

Compare the goals of obtaining an impression of a dentate arch compared to a partially edentulous arch

A

Dentate

  • Capture teeth
  • More tolerant to impression errors

Partially edentulous

  • Capture all teeth (esp abutments)
  • Surrounding tissue
  • Edentulous areas
  • Less error tolerant
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4
Q

Poor fit for stock trays is typically expected where

A

edentulous areas

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5
Q

regions where the stock tray is often under-extended is where

A
  • Hard palate height
  • Post dam distal edge of maxilla (hamular notch)
  • Lingual extent of mandibular tray (FOM)
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6
Q

Where should you use your finger to wipe alginate

A
  • Occlusal surfaces of teeth
  • Proximal surfaces of teeth adjacent to edentulous areas
  • Retromylohyoid fossa (syringe)
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7
Q

Correct W:P ratio for alginate is

A

dimensional accuracy

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8
Q

Dx casts are used to

A
  • Evaluate occlusion and available space
  • RPD survey and framework design
  • Dx wax up if needed
  • Construction of custom tray for secondary impression
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9
Q

What direction should the cast be moved on a survey table to alter the angulation of the guide planes

A

-anteroposteriorly

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10
Q

What direction should the cast be moved on a survey table to alter the angulation of the retentive areas

A

laterally

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11
Q

Latticework should extend how far buccally

A

1-2 mm beyond the crest of the ridge

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12
Q

Finish lines extend onto

A

proximal plates

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13
Q

Lateicwork joins the lingual bar where

A

at the midpoint

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14
Q

Minor connectors are _ to the major connector

A

pependicular (90 degrees)

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15
Q

The distance between the approach arm for an infrabuldge clasp and the gingival margin is

A

4mm

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16
Q

Retentive clasps are how wide… reciprocal

A

-1.5mm taper to 1mm when engaging the undercut …1.5 mm

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17
Q

Sequence for tooth mods

A
  • guide planes
  • HOC (acial surfaces aka B and L)
  • Rest preps
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18
Q

How is a custom tray made for a partial denture

A
  • 1 layer of wax over the edentulous regions and 2 over the teeth
  • 1 layer over hypermobile tissue, thin and narrow crest of alveolar ridge (alternative is just 1 layer of wax over entire edentulous area)
19
Q

Overall thickness of the custom tray should be

A

2-3 mm

20
Q

Why should you vent the tray and where should you do it

A
  • Why= relief area

- Primary v.s secondary support area (do in regions of tissue compressibility, sensitivity and resistance to resorption)

21
Q

Hard prominent areas to relief on the maxilla

A
  • median palatine raphe

- torus palatinus

22
Q

Hard prominent areas to relieve on the mandible

A
  • Torus mandibularis
  • Genial tubercles (if prominent)
  • Prominent mylohyoid ridge
23
Q

Sensitive areas on the maxilla that require relieving

A
  • Incisive papilla
  • Rugae
  • Flabby ridge
  • Sharp bony spicules
24
Q

Sensitive areas on the mandible to relieve

A
  • Mental forame in resorbed ridges
  • Flabby tissue
  • Sharp bony spicule
25
Q

T/F You don’t need to boarder mold an impression for a partial

A

f- need to boarder mold the edentulous areas, abutment areas, and lingual bar/plate area

26
Q

The depth of the FOM should be verified how

A

measuring intraorally with a perio probe

27
Q

How much wax due to place for relief

A

1 layer

28
Q

What are the maxillary and mandibular primary support areas

A

Maxillary

  • Hard palate
  • Tuberosities

Mandibular

  • Buccal shelf
  • Retromolar pad
29
Q

What are the maxillary and mandibular secondary support areas

A

Residual ridges!!

+ maxillary rugae

30
Q

Will the custom tray have retention? why or why not

A

no because there are teeth

31
Q

Temperature for green stick compound

A

135-140 degrees F (5 min water bath)

32
Q

Where can’t you blockout undercuts

A

any partial RDP framework area

33
Q

What can be used to block out undercuts

A
  • Teflon tape
  • OraSeal Putty
  • Wax
34
Q

Characteristics of polysulfide impression material

A
  • Highest tear strength
  • Less rigid than PVS
  • Easier to recover (cautious of deformation)
  • Ideal thickness= 3 mm
  • Working time= 8-10 mins
  • Pour 15-30 min after removal from mouth
  • Can’t be re-poured
35
Q

Characteristics of PVS

A
  • Very accurate
  • Very dimensionally stable (can pour 1 week after removal)
  • Can re-pour
  • 3-5 min working time
  • Ideal material thickness= 3 mm
  • Better recovery from deformation than polysulfide
36
Q

What should you do after placing in the tray to take the secondary impression

A

boarder movements

37
Q

How can you prevent fracture of the cast during separation

A
  • Cast should be damp
  • Heat tray to soften (torch)
  • Cut tray if necessary
38
Q

Which is done first the survey crown prep or rest preps

A

rest preps

39
Q

T/F The impression used for the survey crown impression can be used for the RPD framework fabrication as well

A

f- need 2 impressions

40
Q

What should you do before cementing a survey crown

A

survey it make sure the contours are what you want

41
Q

What must you do to your pindex for your survey crown

A

tripod it

42
Q

What is drawn in red for the framework drawning

A
  • finishlines
  • retentive clasps
  • tripod marks
43
Q

What is required to submit to the lab when a post is desired

A

matric

Removable Spring (8 decks)

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