Krisztina Marton. Every denture: acrylic denture with wire clasp (spoon denture)
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Transcript of Krisztina Marton. Every denture: acrylic denture with wire clasp (spoon denture)
Krisztina Marton
The Individual Parts of the RPD1. Saddles
2. Occlusal rests and similar components3. Direct retainers
4. Connectors
SaddlesReplaces the lost alveolar tissues (flange) and
carries arteficial teeth (real saddle)Types:
BoundedFree end
Material of the fitting surfaceAcrylic 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
Connectors of the RPD
Upper archDistributes load to the
mucosa Butterfly Horseshoe Fenestrated Sceletonized Labial bar
Minor connectorsconnect small of the metal frame to the baseplate
Major connectorsconnect the two sides of the denture to eachother
• 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
Lingual bar
Direct retainers of the RPDThese 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
TypesCLASPS
Retentive clasp arms (usually incorporated in clasp units)PRECISION ATTACHEMENTS
ClaspsAs 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
ClaspTypes:
gingivally aproachingocclusally 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
clasparm
Clasp unit
Gingivally aproaching clasp
Occlusally aproaching clasp
Clasp unit