Summarizes parts of RPD, their functions and principles of how to design an rpd. Dr. Almas Muhammad Arshad

1. REMOVABLE
PARTIAL DENTURE
–
Parts,Functions,Principlesof
design
Dr. Almas Muhammad
Arshad
House Officer
Prosthodontic Department

2. OBJECTIVESOF PROSTHODONTIC
REPLACEMENT
• Restoration of esthetics
• Restoration of function
• Preservation of health

3. REMOVABLEPARTIALDENTURE:
“A removable prosthesis that
replaces missing teeth in a
partially dentate arch, and can
be removed or replaced by the
patient himself.”

4. TYPES
1. Acrylic partial denture
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
Rest Retainers
Direct
Indirect
Denture Base

7. MAJORCONNECTORS
Unification
Distribution of applied forces
•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 posterior palatal 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
• Transfers functional stresses to abutment teeth
• Maintain a path of insertion
Base
Other Components
(Clasps, rests,
Indirect retainers)

13. RESTSANDRESTSEAT
• Provides vertical support
• 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 RPD that functions to retain
and prevent the dislodgement of the
denture
Intracoronal
Precision
Semi
precision
Extracoronal
Clasps
Prefabricated
attachments

16. TYPESOFCLASP:
Cast circumferential clasp Bar Clasp

17. PREFABRICATED
ATTACHMENTS

18. INDIRECTRETAINERS
Stabilization
Prevents the rotational displacement
of rpd
Functions through lever action on
opposite side of the fulcrum line

19. FULCRUMLINE
An imaginary line around 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 of artificial teeth:
• Acrylic
• Porcelain
• Metal
Tube teeth

25. PRINCIPLESOFRPD
DESIGN

26. • Design of removable partial
denture should be
1.Simple
2.Comfortable
3.Harmless to the remaining teeth
PRINCIPLESOFRPDDESIGN

27. BIOLOGICALCONSIDERATION
•Teeth and periodontal tissue
•Inclination of abutment
•Status of residual ridge
•Types of edentulous ridge
•Occlusion

28. Good Support
but poor
stability
Poor Support
Poor Stability
Poor
support
and poor
to fair
stability

29. MECHANICALCONSIDERATION
•Retention
•Stability
•Support

30. 1.How the RPD is 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 the tooth and tissue
support units
•Major Connector – Rigid for
proper distribution of load
•Minor connector
•SUPPORT

32. 3. How the RPD 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 Retention units to
the supporting units
Indirect Retainers - STABILIZATION
5.Outlining and joining the
edentulous area to already
established design

34. SEQUENCEOFDESIGN
Retainers
Minor
connector
Major
connector
Rests

35. References
•McCraken’s Removable partial
prosthodontics A.B Carr David T
Brown 12th edition

36. THANKYOU