RPD saddles and support

Question 1

study models are used to assess

Answer 1

1) Edentulous areas
- size and position
- which teeth are going to be replaced
2) undercut on remaining teeth that may be used for retention (POI and clasping)
3) undercut on remaining teeth that will result in a gap between RPD and tooth
4) Occlusion

Question 2

designing RPD

Answer 2

saddles
support
retention
reciprocation
bracing
connectors 
indirect retention
declutter and prep work requried

Question 3

support is

Question 4

mucosa borne RPD rules

Answer 4

make footprint large as possible
hard palate provides adequate support for upper
extend the denture above survey line for teeth which are not in contact with denture

Question 5

tooth borne dentures

Answer 5

bounded saddles
position occlusal rests either side of saddle areas
keep close as possible

Question 6

rest seats

Answer 6

for occlusal cingulum and incisal rests
- direct loading down long axis of tooth
1.5mm
sauser shaped

Question 7

tooth and mucosa borne

Answer 7

free end saddles
position occlusal rest distant to the saddle area
ensures load is transmitted down axis of tooth when denture rotates
- ensures clasps disengage from undercut under load when denture moves

Question 8

occlisal rests for saddles and free end saddles where to place

Answer 8

occlusal rests close to saddle as possible between teeth

free end saddles - move rests to opposite side of abutment tooth