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Removable Partial Dentures

Removable Partial Dentures. Krisztina Marton. Every denture: acrylic denture with wire clasp (spoon denture). Designing Removable Partial Dentures. The Individual Parts of the RPD. 1. Saddles 2. Occlusal rests and similar components 3. Direct retainers 4. Connectors. Saddles.

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Removable Partial Dentures

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  1. Removable Partial Dentures Krisztina Marton

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

  3. Designing Removable Partial Dentures

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

  5. 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

  6. Connectors of the RPD 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

  7. Lingual bar

  8. Lower connectors

  9. Lower connectors 2

  10. 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

  11. 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

  12. Clasp Types: gingivally aproaching occlusally aproaching • Material: • 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 • Stainless steel

  13. Clasp unit clasparm

  14. Gingivally aproaching clasp

  15. Occlusally aproaching clasp

  16. Clasp unit

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