Direct retainers and clasps for removable partial dentures. Elements of the direct retainer. Theory of the clasp-parts and function Flashcards Preview

Prosthetics > Direct retainers and clasps for removable partial dentures. Elements of the direct retainer. Theory of the clasp-parts and function > Flashcards

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

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