RPD Cram

Question 1

SDA occlusal units

Answer 1

3-5 provide satisfactory function

Question 2

RPD design components

Answer 2

Saddles
Support
Retention
Reciprocation/bracing
Major connector
Indirect retention

Question 3

How is support achieved?

Answer 3

Rests

Question 4

How is retention achieved?

Answer 4

Clasps, guideplanes

Question 5

Define the Kennedy Classifications

Answer 5

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

Question 6

Define the Craddock Classifications

Answer 6

Tooth borne
- Resistance to occlusal load Via PDL

Mucosa borne
- Resistance to occlusal load via mucosal coverage

Tooth + mucosa
- Combo
- In free end saddles

Question 7

Define support

Answer 7

Resistance to vertical movement towards the mucosa

Question 8

Define retention

Answer 8

Resistance to vertical displacement forces away from the mucosa

Question 9

Define Stability

Answer 9

Resistance to horizontal movement

Question 10

Define indirect retention

Answer 10

Resistance to rotational displacement of denture

Question 11

Define reciprocation

Answer 11

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

Question 12

Function of rests

Answer 12

Resistance of movement towards mucosa
Distribute load
Prevents OE of unopposed

Question 13

Cocr/gold/SS mm

Answer 13

0.25mm
0.5mm
0.75

Question 14

Where are clasps placed?

Answer 14

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

Question 15

What is the minimum clasp length for CoCr

Answer 15

15mm

Question 16

Define the RPI system

Answer 16

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

Question 17

Mechanism of an RPI system

Answer 17

Rotation of denture at mesial rest
I bar clasp rotate down
Torque avoided

Question 18

Examples of maxillary connectors

Answer 18

AP strap
AP ring
Mid palatal strap
Horseshoe
Posterior palatal strap

Question 19

Examples of mandibular connectors

Answer 19

Lingual bar
Lingual plate
Sublingual bar

Question 20

RPD clinical stages

Answer 20

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

Question 21

When do you need a preliminary record block

Answer 21

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

Question 22

Materials to take RPD master imp in

Answer 22

Medium bodied PVS - Extrude
Polyether - Impregum
Alginate

Question 23

Lab card info for primary imps

Answer 23

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

Question 24

What must be completed before visit 2?

Answer 24

Survey
Decide rest seats + design

Question 25

Lad card info for master imps

Answer 25

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

Question 26

Lad card info for FW trial

Answer 26

Please construct wax record blocks on FW

Question 27

Lab card info for jaw reg

Answer 27

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

Question 28

Lab card info for delivery

Answer 28

Please take to finish in acrylic

Question 29

How do we do a retrial?

Answer 29

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

Question 30

What to check on delivery

Answer 30

Pin on table Occlusion Extensions In mouth Retention extension stability occlusion adjusted with acrylic bur