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Removable partial denture
The document discusses removable partial dentures (RPD), detailing their parts, functions, and design principles aimed at restoring aesthetics and function for partially edentulous patients. It categorizes different types of RPDs, including acrylic and cast partial dentures, and describes key components such as major and minor connectors, rests, direct and indirect retainers. The design principles focus on biological and mechanical considerations essential for effective support, retention, and stability of the prosthetic appliance.
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Removable partial denture
- 1. REMOVABLE PARTIAL DENTURE – Parts,Functions,Principlesof design Dr. AlmasMuhammad Arshad House Officer Prosthodontic Department
- 2. OBJECTIVESOF PROSTHODONTIC REPLACEMENT • Restorationof esthetics • Restoration of function • Preservation of health
- 3. REMOVABLEPARTIALDENTURE: “A removable prosthesisthat replaces missing teeth in a partially dentate arch, and can be removed or replaced by the patient himself.”
- 4. TYPES 1. Acrylic partialdenture Temporary dentures 2. Cast partial denture
- 5. • Interim denture •Enhance the esthetics, stabilization and/or function for a limited time • Later replaced by definitive prosthesis • Transitional denture • An interim denture in which artificial teeth are added as natural teeth lost • Treatment denture • Used for the purpose of treatment or conditioning of tissue • Post surgery TEMPORARYREMOVABLEPARTIALDENTURES
- 6. PARTSOFRPD: Removable partial denture Connectors Major Minor RestRetainers Direct Indirect Denture Base
- 7. MAJORCONNECTORS Unification Distribution of appliedforces •Provides cross-arch stability to help resist the displacement by functional stresses.
- 8. MANDIBULAR MAJOR CONNECTORS: •Lingual Bar (All situations where min 8mm space coverage is req) • Sub-lingual bar (Distance of floor or mouth to gingival margin is < 6mm)
- 9. • Continuous Bar(Wide diastema) • Labial Bar (Severe lingual inclinations)
- 10. MAXILLARY MAJOR CONNECTORS: •Single palatal strap (Bilateral short span edentulous spaces) • Single palatal bar (Interim partial dentures) • Anterior posterior palatal strap (All Kennedy situations, Multiple saddle areas)
- 11. • Anterior posteriorpalatal bars (Kennedy Class II and IV) • Complete Palatal plate (Distal extension conditions, Cleft palate, Heavy occlusal forces) • U shaped (Inoperable tori, Least suitable design)
- 12. MINORCONNECTORS • Functions • Transfersfunctional stresses to abutment teeth • Maintain a path of insertion Base Other Components (Clasps, rests, Indirect retainers)
- 13. RESTSANDRESTSEAT • Provides verticalsupport • Transfers the forces along the long axis of teeth • Positional maintenance • Rest Seat: • The prepared surface on the abutment teeth to receive the rest
- 14. •Types: • Occlusal • Incisal •Cingulum
- 15. DIRECTRETAINERS Component of RPDthat functions to retain and prevent the dislodgement of the denture Intracoronal Precision Semi precision Extracoronal Clasps Prefabricated attachments
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- 18. INDIRECTRETAINERS Stabilization Prevents the rotationaldisplacement of rpd Functions through lever action on opposite side of the fulcrum line
- 19. FULCRUMLINE An imaginary linearound which the denture tends to rotate.
- 22. DENTUREBASE • Support, retention,stress distribution, esthetics • Maxillary denture base Maxillary Tuberosity area • Mandibular denture base Retromolar pad
- 23. ARTIFICIALTEETH • Types ofartificial teeth: • Acrylic • Porcelain • Metal Tube teeth
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- 26. • Design ofremovable partial denture should be 1.Simple 2.Comfortable 3.Harmless to the remaining teeth PRINCIPLESOFRPDDESIGN
- 27. BIOLOGICALCONSIDERATION •Teeth and periodontaltissue •Inclination of abutment •Status of residual ridge •Types of edentulous ridge •Occlusion
- 28. Good Support but poor stability PoorSupport Poor Stability Poor support and poor to fair stability
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- 30. 1.How the RPDis supported? •Tooth Supported • Kennedy class 3 and 4 • Tooth – Tissue Supported • Kennedy Class 1 and 2 • Away from abutment Tissue Support • Adjacent to edentulous area Tooth support • Quality of Ridge and accuracy of impression is the key
- 31. 2. Connecting thetooth and tissue support units •Major Connector – Rigid for proper distribution of load •Minor connector •SUPPORT
- 32. 3. How theRPD is to be retained • Natural Sources • Frictional resistance • Interfacial surface tension • Palatal vault • Occlusion • Clasp assembly (avoiding torqueing forces) • Splinting • RETENTION
- 33. 4.Connecting the Retentionunits to the supporting units Indirect Retainers - STABILIZATION 5.Outlining and joining the edentulous area to already established design
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- 35. References •McCraken’s Removable partial prosthodonticsA.B Carr David T Brown 12th edition
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