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

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

OUTLINING THE SADDLE AREA

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

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:

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

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

RETENSION Clasping configuration

Distribution of clasps.

Distribution of clasps.

Distribution of clasps.

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

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

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

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

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

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

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

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

Clasps used with free end saddles 5.Combination clasp