planning the design for removable partial dentures (part 2). prof dr.ahlam el-sharkawy pharos...

PLANNING THE DESIGN FOR REMOVABLE PARTIAL DENTURES (PART 2)

.Prof Dr.Ahlam El-Sharkawy Pharos university in

Alexandria

4- Joining the saddles and retainer units

:Joining the saddles and retainer units

Mandible1. Lingual Plate Major Connector

2. Lingual Bar Major Connector

3. Double lingual bar

Joining the saddles and retainer units

Maxilla

Ring design

Palatal horseshoe

Palatal strap

FIFTH STAGE

Indirect Retainers

Factors influencing effectiveness of indirect retainer:•1-Distence from the fulcrum line,•2-Effectiveness of tooth support.•3-Effectiveness of direct retainers.•4-Regidity of the connector supporting the indirect retainer.•5- Indirect retainer must be rigid.

Resistance: means resistance to antero-posterior movement.

In the mandibleIt come from…1. Posterior slope of retromolar area.2. Mesialy placed occlusal rest.3. Embrassure hook.

4. In Maxilla:

5. It come from…6. -------------------7. 1-Posterior placed occlusal rests.8. 2 – Anterior slop of the palate