Principles in metallic RPD design

11-5-2016By : Cezar LahhamSupervisors : Dr Walla’ Hamadneh Dr Mutaz Arman

Outline :

Chapter 4: Biomechanics of RemovablePartial Dentures

Chapter 10: Principles of

Removable Partial Denture Design

1- Revision : 4 min

2-

Kennedy Classification

Support Types

Totally Tissue support Tooth-tissue support Totally tooth support

Canadian dentist, in 1926 Ante's law refers to a group of proposals related to crown-to-root ratio

Support

Class I + II = Tooth-tissue Support Class III + IV = Totally tooth support or

tooth-tissue support

Ref; http://www.oxfordreference.com/view/10.1093/oi/authority.20110803095415976

RPD Components

Fulcrum Line

Lever

In RPD !!!

Rest

Connector

Lever Class 1

Video::: class 2

prosto_0001.wmvprosto 2_0001.wmv

12

Clasp

Class III :

The Design of RPD

Who draw the design of RPD ??

The Design of RPD

- Simple- Obtain good base adaptation- Use what is present (e.g. existing rest seats)- Plan for the future- Occlusion- At the end of treatment

Steps

1- determine the Class 2- Type of support 3- OSCAR

outlineSupport

Connectors

Retention

:rests + indirect retainers

Components design

Rest : Incisal,Lingual,Embrasure,occlusal,Onlay

IR: Double bar,Strap ,occlsal,…. Connectors : -Upper: 1-Full Palatal plate 2-AP.P.P 3-A P P 4-P strap -Lower :1-Lingual bar 2-Double lingual 3-L. Strap

4-Labial bar

Revision

Clasps : Supra&infralbulge1-Circlet 2–embrasure”double aker’s”3-Ring 4-reverse action “fish hock”5-Onlay6-back action7-continous

Revision

RPI system

RPA system

Combination clasp

Half and half clasp

Revision

Class I + IITooth-tissue support

Rest:Mesially

Indirect Retainer

Connectors

Clasps infra

Class III + VI

Tooth support

Rests: close to the edentulous area

No need to indirect retainer

Connectors

Clasps supra

Examples ::

References