Direct Retainers Flashcards
1
Q
Circumferential Clasp
A
Class III RPDs
2
Q
Embrasure Clasp
A
Retainer in dentate area
- Class II and III w/no modification space
- Class IV
3
Q
Ring Clasp
A
ML tipped mandibular distal molar in class III RPD
4
Q
Back Action Clasp
A
None
5
Q
Reverse Action Clasp (Hairpin)
A
Retentive undercut adjacent to edentulous area
When tissue undercut present (1/2 T or T-bar contraindicated)
6
Q
Half-and-Half Clasp
A
Retentive undercut away from edentulous area (None)
7
Q
Multiple Clasp
A
On dentulous side
8
Q
Combination Clasp
A
- Distal Extension RPD (Class I and II)
- Mesial rest not possible, must use distal rest
- Mesiofacial undercut
- Mesial inclination of abutment distal surface
9
Q
RPC (RPA)
A
- 2nd choice for distal extension RPDs (Class I and II)
- Mesiofacial undercut
10
Q
Reverse Circumferential Clasp
A
- Distofacial undercut adjacent to edentulous space
- 1/2 T-clasp contraindicated (e.g. tissue undercut)
11
Q
Bar Clasp
A
- Distal Extension RPD
- Tooth-supported RPD where esthetics a factor
12
Q
T-bar clasp
A
None
13
Q
1/2 T-bar
A
- Distofacial undercut adjacent to edentulous area
- Bar clasp desired but esthetics not important
14
Q
RPI
A
1st choice for distal extension RPDs
15
Q
I-bar
A
Esthetic concerns
