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Removable Partial Dentures > Impressions and Casts > Flashcards

Impressions and Casts Flashcards

1
Q

• Accurate reproduction of teeth &

adjacent tissues

A

Diagnostic cast

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2
Q

How are the casts mounted in RPD for Analysis of occlusion, interarch space,
over erupted teeth, tuberosity interference?

A

Facebow transfer

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3
Q 
– Analysis of contour of hard & soft tissue
– Determine path of insertion:
• Guide planes, Retentive undercut, 
Interferences, Esthetics
– Determine if abutment restorations 
required
– Determine if surgical intervention needed
– Design RPD
– Develop plan for tooth modifications
A

Survey cast

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4
Q

______ is the material of choice for impressions
– Ease of use
– Inexpensive
– Less surface detail than elastomeric
materials
– Adequate accuracy/precision for Dx cast

A

Alginate

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5
Q 
The \_\_\_\_\_ of alginate:
– Not affect accuracy
– Affect consistency
• Thinner mix for duplicating casts
– Affect strength
– Affect setting time
A

Water/powder ratio

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6
Q

If the water temp is hotter, how is the setting time affected?

A

Decreased setting time

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7
Q

HOw long is impression left in the mouth?

A

2-3 mins

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8
Q

How should the impression tray be removed from the mouth?

A

One motion “snap”

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9
Q

– Alginate sticking to teeth
• Loss of tooth pellicle
– Teeth just cleaned
– Repeated impressions
– Alginate pulling away from tray: adhesive not used
– Voids in critical areas
– Inadequate extension to soft tissue areas
– Layered impression: material on teeth/tissue set
before tray seated
– Granular impression: inadequate spatulation,
premature removal
– Contact between cusp tips & tray

A

Potential problems

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10
Q

How long after can the impression be poured into stone?

A

12 mins

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11
Q

What type of stone is used for diagnostic casts?

A

Yellow stone

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12
Q

What type of stone is used to pour the master cast?

A

Green stone

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13
Q

What pour technique is used for pouring up impressions?

A

2 step technique

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14
Q

Which step of the pour is described?
– Impression filled with dental stone
– Suspend filled tray by handle for 10-12
minutes until initial set of stone
• Water rises to surface
• Tooth & tissue surface on
bottom stronger, more dense
– If invert tray immediately, teeth & soft
tissue surface weakest, least dense.
• Cast prone to abrasion during surveying.

A

1st step

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15
Q

What step of the pour is described?

Impression with set stone inverted into base patty

A

Step 2 pour

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16
Q

How long should you wait before separating cast from impression?

A

45-60 mins

17
Q 
• Supplement oral cavity exam
–Potential problems more apparent
• Extruded teeth, tuberosity interferences, 
Interarch space, malposed teeth, 
occlusal plane problems
–Help to educate patient & aid in 
presentation of treatment plan
A

Mounted diagnostic casts

18
Q

• Relate MX cast to articulator condylar
elements at the same orientation of
maxillary teeth to patients’ condyles
– More accurate occlusion

A

Face-bow Transfer (Hanau)

19
Q

What is the preferred bite block material for taking a bite registration on bite fork?

A

Regisil PVS

20
Q

What should the condylar guidance angle be set to on the Hanau articulator?

A

30 degrees

21
Q

What should the lateral or Bennett angle be set to on the Hanau articulator?

A

15 degree

22
Q

What should the incisal table angle be set to on the Hanau articulator?

A

0 degrees

23
Q

If you have few teeth remaining, should you take a jaw relation in MIP or CR?

A

CR

24
Q

If you have numerous teeth with harmonious occlusion remaining, should you take a jaw relation in MIP or CR?

A

MIP

25
Q

Do you tripod mark on your cast jaw relation record for MIP or CR?

A

MIP

26
Q

(Extensive edentulous areas)
: adequate existing intercuspation
• Tooth-tooth contact
• Recording media on occlusion rims only

A

MIP

27
Q 
(Extensive edentulous areas)
 inadequate existing intercuspation
• Musculo-skeletal position: no tooth or rim contact
• Alu-wax recording media
• Registration VPS
A

CR:

Removable Partial Dentures (20 decks)

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