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PLANNING THE DESIGN FOR REMOVABLE
PARTIAL DENTURES
. Prof Dr.Ahlam El-SharkawyHead of prosthodontic Department
Pharos university in Alexandria
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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
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OUTLINING THE SADDLE AREA
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OUTLINING THE SADDLE AREA EXTENSION
1-In free end
saddle2-In
bounded sad
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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:
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POSITION OF REST:-
Free end saddle Away
from the saddle
Bounded saddle Near the saddle
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SHAPE OF THE REST
Free end saddle saucer shape
preparation
Bounded saddle
Box shapepreparation
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RETENSIONClasping configuration
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DISTRIBUTION OF CLASPS.
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DISTRIBUTION OF CLASPS.
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DISTRIBUTION OF CLASPS.
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OCCLUSALLY APPROACHING CLASPS
Aker Clasp Reversed Aker clasp RPA clasp Back-Action clasp Ring Clasp Compound Clasp Multiple Clasp Extended-Arm Clasp
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GINGIVALLY-APPROACHING CLASPS The T-Shape The U-Shape The L-Shape The C-Shape RPI Clasp
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THE FUNCTIONAL ELEMENTS OF THE CLASP 1-The Retentive arm 2-The Reciprocal arm 3-The Occlusal rest 4-The Minor connector
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CLASPS USED WITH BOUNDED SADDLES
1-Ring clasp
2-Gingivally approach
3- Aker clasp
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CLASPS USED WITH FREE END SADDLES.
1.Reversed Aker clasp
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CLASPS USED WITH FREE END SADDLES
2.Back-action clasp
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CLASPS USED WITH FREE END SADDLES
3.R P I CLASPR Mesial rest P Proximal plate I I- bar retentive arm
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CLASPS USED WITH FREE END SADDLES
4.Gingivally Approaching Clasp.
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CLASPS USED WITH FREE END SADDLES
5.Combination clasp