Prosthetics 5 - Support and indirect retention Flashcards Preview

ICS - REMOVABLE PROSTHETICS > Prosthetics 5 - Support and indirect retention > Flashcards

Flashcards in Prosthetics 5 - Support and indirect retention Deck (17)
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what is the definition of support?

it is the resistance to vertical load directed through the denture to the underlying mucosa.
one example of vertical load is occlusal forces during chewing.


the force transmitted through the prosthesis is ultimately resisted by?



support for the removable prosthesis can be achieved through the use of?

- teeth (tooth-borne)
- mucoperiosteum (mucosa borne)
- both teeth and mucosa (tooth/mucosa borne)


mucosal support can be gained from?

- saddles
- connectors


tooth support gained through the use of? how is the force transmitted?

- periodontal ligament.
- force is transmitted through tooth to the PDL, and ultimately to the underlying bone


tooth support can be gained from using which devices?

- occlusal or cingulum rests
- onlays
- overdenture abutments
- connectors


what is the advantage of using an overdenture abutment?

if crown is carious and removed + tooth is root treated, denture can be supported over the root. this preserves the alveolar bone and allows patients to receive feedback from the PDL


support: why should we beware of periodontally compromised teeth?

if there is less PDL left, this means that there is less support the tooth can offer. when there is less support, the increased load on the tooth may further compromise its periodontal health


saddles - what types of support do each of these provide?
1. bounded saddles
2. free ended saddles
3. large saddles

1. tooth support possible
2. tooth/mucosa borne at best
3. mucosa borne


what is indirect retention?

it is the prevention of displacement of saddle away from ridge, by extension of the denture


indirect retention: movement of one end can only occur if?

movement can only occur if the other end is free


indirect retention: if both ends are supported, e.g. in class 3 denture, movement can only occur if?

movement can only occur if there is a displacement of the central pivot, in this case the disengagement of a clasp


indirect retention: the removable prosthesis should aim to? how does it achieve its aim?

- reduce the effect of the displacing force
- can be done by placing the clasp as close as possible to the saddle, and by placing the indirect retainer as far as possible from the saddle


denture components: what do saddles provide?

retention, support, bracing


denture components:
what do connectors provide?

support, indirect retention, bracing


denture components:
what do clasps provide?

retention, support, bracing


denture components:
what do rests provide?

support and indirect retention