RPD Support Flashcards
What is meant by the term ‘support’?
Resistance of denture to occlusal load
What does a Kennedy Classification describe?
Number and distribution of edentulous areas present
What are the Kennedy Classifications?
I. Bilateral free end saddle
II. Unilateral free end saddle
III. Unilateral bounded
IV. Anterior bounded (crossing midline)
What does a Craddock Classification describe?
Type of support for an RPD
What are the Craddock Classifications?
I. Tooth-borne
II. Mucosa-borne
III. Tooth and mucosa borne
POST CRADDOCK
IV. Implant-borne
V. Impland and mucosa borne
How does a tooth supported RPD function?
FIRST choice for RPD
- Transmit load via PDL
- Allows denture to feel like natural dentition
- More comfortable
- Protects trauma of soft tissue
How does a mucosa supported RPD function?
- Covers as large an area as possible
- Allows denture to move slight (poss gingival margin trauma)
What types of rests are there?
- Occlusal
- Cingulum
- Incisal
- Onlay
- Overlay
- Ledge
- Ring
What is the purpose of a rest?
- Support RPD against vertical loading (direct load via long axis of root)
- Indirect retention
Where are rests ideally placed?
Immediately adjacent to saddle
–> RPI placed MESIAL
Give examples of mucosa bone RPDs (Craddock II)
- Every
- Spoon
- Modified spoon
What is the compressive difference between tooth and mucosa?
Tooth (i.e. periodontium) = 0.1mm
Mucosa = 0.2mm
–> RPI system to reduce this discrepancy
