1. Removable Partial Dentures
Krisztina Marton

6. Every denture: acrylic denture with wire clasp (spoon denture)

10. Designing Removable Partial Dentures

14. The Individual Parts of the RPD
1. Saddles
2. Occlusal rests and similar components
3. Direct retainers
4. Connectors

15. Saddles
Replaces the lost alveolar tissues (flange) and carries arteficial teeth (real saddle)
Types:
Bounded
Free end
Material of the fitting surface
Acrylic resin
Disadvantageous to the health of the underlaying mucosa and the gingival margin of the remaining teeth
Metal, or metal-acrylic combination
Provides better health of the mucosa because of the metal’s highly polished surface, acrylic can provide acceptable esthetics

17. Connectors of the RPD Lower arch Upper arch
Minor connectors
connect small of the metal frame to the baseplate
Major connectors
connect the two sides of the denture to eachother
Upper arch
Distributes load to the mucosa
Butterfly
Horseshoe
Fenestrated
Sceletonized
Labial bar
Lower arch
Not distributes load to the mucosa
Lingual plate
”finger type” lingual plate
Lingual bar
Lingual bar with continuous clasp (Kennedy bar)
Sublingual bar
Dental plate
Labial (or buccal) bar

18. Lingual bar

19. Lower connectors

20. Lower connectors 2

23. Direct retainers of the RPD
These provide resistance to movement of the denture along the path of displacement and/or path of insertion and withdrawal during any function (hindering its removal of its supporting tissues
Types
CLASPS
Retentive clasp arms (usually incorporated in clasp units)
PRECISION ATTACHEMENTS

24. Clasps
As the denture is inserted, the flexible tip of the retentive arm passes over the maximum bulbosity (the prosthetic equator) of a tooth and enters an undercut area.
Once the denture is fully seated, the clasp sits passively in its place , just contacting the tooth surface without forcing on it.
As the denture is subjected to displacing forces during function , the tip of the clasparm is drawn back towards the maximum bulbosity of the tooth . If the displacing forces do not exceed the level of lifting the clasp arm over the survey line the denture will stay in position

25. Clasp Material: Types: gingivally aproaching occlusally aproaching
Rigid: Cast metal (usually cast together with the baseplate)
Gold alloys
Silver palladium alloys
Cobalt cromium alloys
Stainless steel
Titanium
Elastic: Wrought wire (later adapted to the flange)
Gold

26. Clasp unit
clasparm

27. Gingivally aproaching clasp

28. Occlusally aproaching clasp

29. Clasp unit