Fundamentals of RPD Design Flashcards

1
Q

which kennedy classification cannot have a modification space?

A

four

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

tooth tissue supported (2)

A

kennedy class 1
kennedy class 2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

tooth supported (2)

A

kennedy class 3
kennedy class 4 (single edentulous area crossing the midline)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

whats next (4)

A

survey the cast and draw/carve orientation (tripod) lines
draw heights of contour
evaluate possible guide planes
identify undercuts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

what is opposing (2)

A

natural teeth or denture
super erupted teeth

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

lets take this info and make an RPD (6)

A

Major Connectors
* Minor Connectors
* Rests
* Retentive Clasps
* Reciprocal clasps/plates
* Indirect retainers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

mandibular RPD major connectors (2)

A

lingual plate
lingual bar

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

5 reasons to lingual plate

A
  • Opposing a maxillary denture
  • Inadequate space for a bar (8mm needed)
  • Anticipate loss of additional teeth
  • Mandibular tori
  • Aid in lateral and rotational stability
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

maxillary major connectors (4)

A

palatal strap
AP strap
anterior palatal strap
full palatal coverage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

if the major connector is not plating the lingual surfaces of the max teeth the frame needs to be at least

A

6 mm away from the gingival margin

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

minor connectors

A

portion of the RPD framework that connects the major connector to
-the clasp assembly
-indirect retainer
-denture base

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

in a kennedy class 3 RPD the rests of the RPD are located….
A. Away from the edentulous area on the on the teeth adjacent to the edentulous area
B. Toward the edentulous area on the teeth adjacent to the edentulous area
C. As far away from the edentulous area as possible
D. Rest seats should not be located on the teeth next to the edentulous area.

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

RPD Rests
* Need approx – mm of inter-occlusal clearance
* – the buccal/lingual width
* Edentulous area bordered by teeth on anterior and posterior
- Rests located — the edentulous space
* Free end distal extension
- Rest located — from the edentulous area

A

1.5
1/3
toward
away

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

How many retentive clasps would typically be utilized in a kennedy class 1 RPD design?2
3
4
5

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Number of clasps Necessary (4)

A

1: 2 clasps
2: 3 clasps
3 & 4: 4 calsps

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

of clasps =

A

kennedy class + 1 with a max of 4 clasps

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

how to alter the retentiveness of a clasp? (6)

A
  • Clasp length
  • Clasp diameter
  • Clasp taper
  • ½ round or round
  • Material
  • Amount of undercut engaged
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

retentive clasps (2)

A

infrabuldge
suprabuldge

19
Q

infrabuldge
(3)
suprabuldge
(2)

A

I bar clasp
T and 1/2 T clasp
Y clasp

cast circumferential clasp (1/2 round and round)
wrought wire (combination clasp)

20
Q

Infrabuldge clasps
advantages (2)
contraindications (3)

A

esthetic
more retentive

  • Excessive soft tissue undercut
  • Lack of vestibular depth (min 4 mm)
  • Inability to place the terminus at the gingival 1/3
21
Q

infrabuldge clasps

A

best utilized on a sound abutment tooth adjacent to a free end edentulous area provided the tooth is tall enough and provides relief (undercut( gingival to the distal guide plate

22
Q

suprabuldge clasps
* Circumferential
* 1/2 round or round cast
* Best utilized
* ½ round -
* round -

A

Tooth supported RPDs
Tooth/Tissue supported RPDs

23
Q

Wrought Wire Clasps (Combination)


A

Best used on Tooth/Tissue Supported RPDs when the abutment tooth is compromised and an ideal guide plane is not present
THE REST SEAT IN THIS SENARIO WILL BE TOWARD THE FREE END DISTAL EXTENSION

24
Q

what if i dont have any undercut (3)

A

surveyed crown
place a divot
place a composite

25
When an RPD is completely seated, what is the function of the reciprocal clasp? A. To aid in retention by applying force from the lingual B. To counter-balance the force applied by the retentive clasp when it is in the designated undercut C. It serves no purpose when fully seated
26
reciprocal clasps * The reciprocal clasp is utilized to ... * The "Action Distance of Stern" is that distance that the in which the ... - Approx --mm * Located on all teeth that have a retentive clasp
counterbalance the forces applied by the retentive clasp as it passes over the height of contour retentive clasp is reciprocated. 3-5
27
which kennedy class will never have an indirect retainer?
28
Indirect Retainer * Occlusal, incisal, or cingulum * Located on ... * Located --- to the primary fulcrum line which extend through the most posterior abutments * Resists the RPD's tendency to move or rotate in an --- direction
tooth-tissue supported RPDS (Class | and Il) anterior occlusal
29
RPD IMPRESSION TECHNIQUES * --- Impressions * --- impressions * NOTE: PDL of abutment has a vertical displacement of -- mm and the gingival tissue on the residual ridge has a vertical displacement of approx -- mm.
Static Functional 0.25 2
30
RPD impression methods (3)
metal stock ttray w alginate (never plastic) custom tray, bolder mold, PVS impression corrected (altered) cast impression -only on mandibular kennedy class 1 or 2
31
when to consider * Mandibular distal extensions (Class | & Il) * Extensive edentulous spans * Any case where the periphery is distorted & needs correction (overextended ridge area * Framework --- doesn't make contact with the ridge intraorally * Not used in the maxilla due to major connector contact with the palate
tissue stop
32
impression technique framework must fit the mout hand be passive add tray to framework -- mm wax relief
1
33
check seating on cast and in mouth after tray is added (2)
rests must be fully seated also the major connector no resistance to seating
34
check peripheries * tray must be -- mm short of the vestibular extent * No displacement when: - -
2-3 Pulling on the cheeks and lips Patient activates the tongue
35
border molding
same techniques as for a complete denture
36
corrected cast impression (2)
remove wax spacer coat tray with adhesive
37
corrected cast impression * Use --- body impression material * Carefully load tray -no material under rests, guide planes, major connector * Seat with pressure ONLY over the ---, NOT on the ---
light rests saddle
38
no pressure over tray will cause
tissue compression
39
remove and inspect impression no material under --- - remove excess material if present impression detail is correct
rests or minor connectors
40
lab steps (4)
* Section cast-remove extensions * Place retentive grooves or holes in the master cast * Ensure no contact between impression material /tray& cast * Sticky wax framework in place against the teeth
41
box the master cast with the
RPD framework/impression attached and pour the new edentulous ridges in yellow stone
42
add --- to the framework if the metal stops dont contact the cast
duralay tissue stops
43
potential problems with the corrected cast technique (2)
* A framework not seated either during the impression (material under rest, plate) or when being poured will result in an RPD that won't fit properly on teeth/tissues *Stone leaking over teeth during pouring makes articulation impossible
44