1. Removable partial denture design

2. R.P.D design can be define as:
The strategy of selecting component parts for a partial denture to
help control movement of the prosthesis under functional load.

3. The requirements for movement control are generally functions of whether the prosthesis will be tooth supported or tooth-tissue supported.
For a tooth-supported prosthesis, the movement potential is less because resistance to functional loading is provided by the teeth.
For a tooth-tissue–supported prosthesis, the residual ridge presents with variable potential for support.

4. We have two different types of RPDs
Tooth-supported prosthesis.
Tooth-tissue–supported prosthesis.

5. certain points of difference are present between Kennedy Class I and Class II types of partial dentures on the one hand and the Class III type of partial denture on the other.

6. The first consideration is the manner in which each is supported.
Second, the method of impression registration and the jaw record required for each type.
Third, the need for some kind of indirect retention. Which are used in class I & II while in class III they not used.
Fourth, the type to base materials used.
Fifth, their requirements for direct retention.

7. Concepts of Partial Denture Design
Where the prosthesis is supported.
How the support is connected.
How the prosthesis is retained.
How the retention and support are connected.
How edentulous base support is connected.

8. Partial denture support
In an entirely tooth-supported partial denture, the most ideal location for the support units (rests) is on prepared rest seats on the occlusal, cingulum, or incisal surface of the abutment adjacent to each edentulous space.

9. For tooth support prostheses in order to evaluate the potential support that an abutment tooth can provide, consideration should be given to
Periodontal health.
Crown and root morphologies.
Crown-to-root ratio.
Bone index area.
Location of the tooth in the arch.
Relationship of the tooth to other support units (length of edentulous span).
The opposing dentition.

10. For tooth and tissue – supported partial denture, abutment teeth + the edentulous ridge areas
The quality of the residual ridge.
The extent to which the residual ridge will be covered by the denture base.
The type and accuracy of the impression registration.
The design characteristics of the component parts of the partial denture framework.
The anticipated occlusal load.

11. How the support is connected.
This connection is facilitated by designing and locating major and minor connectors, major connectors must be rigid so that forces applied to any portion of the denture can be effectively distributed to the supporting structures. Minor connectors arising from the major connector make it possible to transfer functional stress to each abutment tooth through its connection to the corresponding rest and also to transfer the effects of the retainers, rests, and stabilizing components to the remainder of the denture and throughout the dental arch.

12. How the prosthesis is retained.
Retention is accomplished by placement of mechanical retaining elements (clasps) on the abutment teeth and by the intimate relationship of the denture bases and major connectors with the underlying tissues.

13. How the retention and support are connected.
The direct and indirect retainers must be rigidly attached to the major connector.

14. How edentulous base support is connected.
Which is necessary to ensure rigidity of the base material without interfering with tooth placement.

15. Components of Partial Denture Design
Major connectors:
Minor connectors:
Direct Retainers:
Indirect Retainers:
Denture base :