Basic principles of Removable Partial Denture Design Dr. Emad Hanbali

Outline Outline the edentulous areas to be restored : The classification The primary abutments The guiding planes The anterior posterior tilt

Unmodified Class III

Unmodified Class III

GP 1 Primary abutments GP 2 Unmodified Class III

AP tilt

Support Dual Uniform

Primary supporting elements GP 1 Primary supporting elements GP 2

The Introduction of : One rest = pivot Two rests = fulcrum

Basic principle of design : Cross-arch stabilization : Indirect retention Indirect support

Imaginary fulcrum line GP 1 Imaginary fulcrum line GP 2

GP 1 X GP 2 Perpendicular bisector of fulcrum line to mark the most suitable sight for setting of indirect retention rests and indirect supporting clasps. X

Short span : triangular configuration GP 1 X GP 2 X Short span : triangular configuration

Long span: trapezoidal configuration GP 1 Long span: trapezoidal configuration X GP 2 X

Connectors: Major Connector Minor Connector

Mesh Minor connector Mid palatal strap major connector

AP Palatal strap Ridged design Hygienic design Patient tolerance 6-8 mm AP Palatal strap Ridged design Hygienic design Patient tolerance

Retention : Direct retainers Clasp assembly : Minor connector Rest Retentive arm Reciprocal arm

O : Outline S : Support C : Connector A : & R : Retention OSCAR

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