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OSCE CRAM > RPD Cram > Flashcards

RPD Cram Flashcards

1
Q

SDA occlusal units

A

3-5 provide satisfactory function

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2
Q

RPD design components

A

Saddles
Support
Retention
Reciprocation/bracing
Major connector
Indirect retention

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3
Q

How is support achieved?

A

Rests

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4
Q

How is retention achieved?

A

Clasps

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5
Q

Define the Kennedy Classifications

A

I - bilateral free end saddle
II - unilateral free end saddle
III - Unilateral bounded posterior
IV - Anterior bounded

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6
Q

Define the Craddock Classifications

A

Tooth borne
- Resistance to occlusal load Via PDL

Mucosa borne
- Resistance to occlusal load via mucosal coverage

Tooth + mucosa
- Combo
- In free end saddles

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7
Q

Define support

A

Resistance to vertical movement towards the mucosa

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8
Q

Define retention

A

Resistance to vertical displacement forces away from the mucosa

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9
Q

Define Stability

A

Resistance to horizontal movement

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10
Q

Define indirect retention

A

Resistance to rotational displacement of denture

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11
Q

Define reciprocation

A

Each clasp unit has an opposing element to retentive clasp arm to prevent pressure from clasp acting on the tooth

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12
Q

Function of rests

A

Resistance of movement towards mucosa
Distribute load
Prevents OE of unopposed

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13
Q

Advantages of an every denture design

A

Less harmful mucosa borne
Doesn’t cover gingival margins

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14
Q

Cocr/gold/SS mm

A

0.25mm
0.5mm
0.75

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15
Q

Where are clasps placed?

A

Below the bulbous part of the tooth - undercut
Identified with surveyor

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16
Q

What is the minimum clasp length for CoCr

A

15mm

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17
Q

Define the RPI system

A

Stress relieving system in free end saddles to prevent stress on last abutment tooth
R - mesial
P - proximal plate
I - gingivally approaching

18
Q

Mechanism of an RPI system

A

Rotation of denture at mesial rest
I bar clasp rotate down + mesially to disengage and prevent torque

19
Q

Examples of maxillary connectors

A

AP strap
AP ring
Mid palatal strap
Horseshoe

20
Q

Examples of mandibular connectors

A

Lingual bar
Lingual plate
Dental bar

21
Q

List advantages + disadvantages of Lingual bar

A

ADV
- Perio compromised teeth
- Free from gingival margin

DISADV
- Can’t add teeth
- Less comfortable
- Less rigid
- Not for tori

22
Q

List advantages + disadvantages of lingual plate

A

ADV
- Can add teeth
- Good indirect retention

DISADV
- Covers gingival margin
- Bad for perio/caries

23
Q

List advantages + disadvantages of AP ring

A

ADV
- Good for tori
- Little coverage
- Wide relief of gingival margin
- Rigid
- Palate sensation

DISADV
- Less support to free end saddles across HP
- Uncomfortable
- Greater cross sectional thickness

24
Q

List advantages + disadvantages of plate

A

ADV
- Rigid
- Wide relief
- Support across HP to free end saddles
- Thinner cross section

DISADV
- Mucosal tissue covered
- No sensation/speech

25
Q

RPD clinical stages

A

Primary imps + ask for preliminary record block if required
Master imps
FW trial +/- jaw reg
Tooth trial
Delivery
Review

26
Q

Complete denture stages

A

Primary imps
Master imps
Jaw regi
Tooth trial
Delivery
Review

27
Q

When do you need a preliminary record block

A

If you can’t hand articulate the casts because there are free end saddles
This will allow the occlusion to be recorded and lab can mount casts to this registration

28
Q

Materials to take RPD master imp in

A

Medium bodied PVS - Extrude
Polyether - Impregum
Alginate

29
Q

Lab card info for primary imps

A

Please pour up primary imps in 50:50 plaster + stone and construct light cured acrylic special tray w spacer and with E/O handle
IF NON HAND ARTICULATED
Please also provide preliminary record block on light cured base for registration

30
Q

What must be completed before visit 2?

A

Survey
Decide rest seats + design

31
Q

Lad card info for master imps

A

COCR
Please pour up master imps in improved stone and construct chrome FW per design

ACRYLIC
Please pour up master imps in 100% dental stone and provide record block shellac base for jaw registration

32
Q

Lad card info for FW trial

A

Please construct wax record blocks on FW

33
Q

Lab card info for jaw reg

A

Please articulate casts to regi provided on average value articulator
Please set teeth for tooth trial shade + mould

34
Q

Lab card info for delivery

A

Please take to finish in acrylic

35
Q

How do we do a retrial?

A

Remove teeth + re-record occlusion
When occlusion discrepancy too great/bite propped open

36
Q

What to check on delivery

A

Pin on table
Occlusion
Extensions

In mouth
Retention extension stability occlusion adjusted with acrylic bur

37
Q

Advantages of CoCr

A

Increased:
Strength
Comfort (thinner + greater temp conductivity)
Retention
Accuracy (metal prevents warping during processing)
OH - less porous

38
Q

Disadvantages of CoCr

A

Difficult to make additions
Difficult to repair
Cost
Allergy to Ni Chromium

39
Q

Advantages of Acrylic RPD

A

Cost
Good for perio
Easier to modify + add teeth
Easier to repair

40
Q

Disadvantages of Acrylic RPD

A

Decreased:
Strength
Comfort (thicker to compensate for lower impact strength, more palatal coverage for support)
Accuracy
OH - more porous

OSCE CRAM (40 decks)

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