Prosthetics 4 - Saddles and Connectors Flashcards
acrylic denture - 2 advantages?
- low cost
- easily modified
acrylic denture - indications?
- where life expectancy of denture is short
- if additions are likely to happen
- where there are few remaining teeth
cobalt chromium based dentures - advantages?
- strong and rigid in thin section
- less bulky
- more hygienic if properly designed (covers less tissue)
cobalt chromium based dentures - disadvantages?
- more expensive
- difficult to add to
- requires accurate impression
general aim of prosthodontic treatment?
construct an appliance which is:
- stable
- retentive
- does not damage oral tissues
what is a saddle and what does it carry?
it is part of the partial denture which carries the artificial teeth and replaces lost tissue
what is a free-ended saddle?
a saddle with a single abutment tooth at the mesial end of the saddle
what is a critical abutment tooth? (what happens when it is lost?)
a tooth that turns a bounded saddle into a free-ended one if lost e.g. lone posterior molar
design of saddles:
extension - what does it allow?
allows the spread of the load onto the mucosal surfaces
design of saddles:
shape of polished surface - what happens if it’s bulbous or when it’s concave?
bulbous polished surface: not retentive
concave polished surface: allows cheek and tongue to rest properly
design of saddles:
what are the types of flange designs?
- full
- part
- flangeless
implications of flangeless denture?
it is gum fitted, therefore the tooth sits directly on the ridge
this will cause it to lose its retention properties
what is a connector? what are the 2 general types?
a part of the partial denture which unites other components
- can be major or minor
what is a major connector?
what are the materials it can be made of?
a plate or bar which:
- unites partial denture saddles
- provides bracing
- provides indirect retention
- acts as a splint: holds things in place
can be made of acrylic, cobalt chromium, gold (rarely)
what are some major connectors for lower partial dentures?
- lingual plate (co/cr)
- dental bar
- lingual bar
- split lingual plate (for when there are gaps in teeth)
- swinglock denture
major connectors for upper partial dentures?
- base plate: maximum palatal coverage. can be acrylic or co/cr
- spoon denture/t-denture
- anterior palatal bar (can have horseshoe connector)
- mid palatal bar
- posterior palatal bar
what will be required when there is a free-ended and bounded saddle in one denture?
more extensive coverage: needs more palatal coverage and support
sectional maxillary dentures: what is the safety issue?
it is a tiny denture that replaces one missing tooth; therefore there is a risk that it be inhaled or swallowed by patient
what is a minor connector?
the connecting component between the major connector or base of a partial denture and other units such as clasps and rests
what needs to be considered for connector design?
occlusion needs to be considered; articulated casts required, shows how upper & lower jaw meet together
what needs to be done if the space for occlusion is tight? what is an example of this?
- modifications need to be carried out, such as the placement of a striking plate; can be cast to fit patient’s mouth
