1. Planning the design for removable partial dentures
. Prof Dr.Ahlam El-Sharkawy
Head of prosthodontic Department
Pharos university in Alexandria

2. Principles and planning of removable partial denture designing
First stage– Outlining the saddle area.
Second stage—The support of the saddles
Third stage – The Retention.
Fourth stage –Joining the saddles and retainer units.
Fifth stage –Indirect retention.
Sixth stage– Bracing of the saddles.
Seventh stage– Resistance to anteroposterior movement

4. OUTLINING THE SADDLE AREA

5. OUTLINING THE SADDLE AREA Extension
1-In free end saddle
2-In bounded sad

7. In free end saddle comes from:
Type of support
wide mucosal coverage
greater number of occulsal rest
In free end saddle comes from:
abutment tooth by occulsal rest
Onlays
embrasure hooks.
In bounded saddle
comes from:

8. Position of rest:- Free end saddle Away from the saddle
Bounded saddle Near the saddle

9. saucer shape preparation
Shape of the rest
Free end saddle
saucer shape preparation
Bounded saddle
Box shape
preparation

11. RETENSION
Clasping configuration

12. Distribution of clasps.

13. Distribution of clasps.

14. Distribution of clasps.

15. Occlusally Approaching Clasps
Aker Clasp
Reversed Aker clasp
RPA clasp
Back-Action clasp
Ring Clasp
Compound Clasp
Multiple Clasp
Extended-Arm Clasp

16. Gingivally-Approaching Clasps
The T-Shape
The U-Shape
The L-Shape
The C-Shape
RPI Clasp

17. The functional elements of the clasp
1-The Retentive arm
2-The Reciprocal arm
3-The Occlusal rest
4-The Minor connector

18. CLASPS USED WITH BOUNDED SADDLES
1-Ring clasp
2-Gingivally approach
3- Aker clasp

19. Clasps used with free end saddles.
1.Reversed Aker clasp

20. Clasps used with free end saddles
2.Back-action clasp

22. Clasps used with free end saddles
3.R P I CLASP R Mesial rest P Proximal plate I I- bar retentive arm

23. Clasps used with free end saddles
4.Gingivally Approaching Clasp.

24. Clasps used with free end saddles
5.Combination clasp