PLANNING THE DESIGN FOR REMOVABLE

PARTIAL DENTURES

. Prof Dr.Ahlam El-SharkawyHead 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

saddle2-In

bounded sad

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

SHAPE OF THE REST

Free end saddle saucer shape

preparation

Bounded saddle

Box shapepreparation

RETENSIONClasping 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 CLASPR 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