Flashcards in Direct retainers and clasps for removable partial dentures. Elements of the direct retainer. Theory of the clasp-parts and function Deck (11)
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1
Q
Describe the direct retainer
A
- Component of RPD that prevents dislodgement
- Consists of clasp assembly or precision attachments
2
Q
Intracoronal direct retainer
A
- Receptacle built into crown for abutment tooth
- Insert attached to RPD
3
Q
Extracoronal direct retainer function
A
Claps engage in undercuts to prevent dislodgment
4
Q
Type of clasps according to material
A
- Cast(bar-infrabulge, Circumferential)
- Wrought(circumferential)
5
Q
Type of clasps according to undercut
A
Supra bulge
Infrabulge
6
Q
Function of direct retainers
A
- Retention(dislodgement)
- Support
- Stability(horizontal forces)
- Passivity(retentive forces only —When dislodging forces prevent)
7
Q
Retentive arm function
A
Engages in undercut on abutment for retention
8
Q
Retentive arm made up of
A
- Retentive clasp arm(not flexible and located above HOC)
- Retentive terminal(Flexible and located below HOC)
9
Q
Reciprocal arm function
A
- On side of tooth opposite retentive arm
- Counteracts forces of retentive arm
- Above HOC
10
Q
Shoulder of direct retainer function
A
- Connects body to clasp terminals
- Stabilisation against horizontal displacement
11
Q
Body of direct retainer function
A
Connects rests and shoulders to minor connector