Basic principles of Removable Partial Denture Design

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
GP 1
Primary
supporting
elements
GP 2
The Introduction of :
One rest = pivot
Two rests = fulcrum
Basic principle of design :
Cross-arch stabilization :
A) Indirect retention
B) Indirect support
GP 1
Imaginar
y fulcrum
line
GP 2
GP 1
X
X
Perpendicular bisector
of fulcrum line to
mark the most suitable
sight for setting of
indirect retention rests
and indirect
GP 2
GP 1
X
GP 2
X
Short span :
triangular
configuration
GP 1
X
X
Long span:
trapezoidal
configuration
GP 2
Connectors:
A)
B)
Major Connector
Minor Connector
Mesh
Minor connector
Mid palatal strap
major connector
6-8 mm
AP Palatal strap
Ridged design
Hygienic design
Retention : Direct retainers
Clasp assembly :
1. Minor connector
2. Rest
3. Retentive arm
4. Reciprocal arm
O : Outline
S : Support
C : Connector
A:&
R : Retention
OSCAR
E
N
J
O
Y