Connnectors in FPD.pptx

Connnectors in FPD

1. Connectors in Fixed Partial Dentures DR SRINIVAS REDDY MDS DEPT OF PROSTHODONTICS NAVODAYA DENTAL COLLEGE

2. Connectors are the components of a fixed partial dental prosthesis or splints that join the individual retainers and pontics together.

3. Classification: Rigid Connectors Non Rigid Connectors Tenon mortise Connectors Loop Connectors Split Pontic Connectors Cross pin and wing Connectors

4. RIGID CONNECTORS

5. Rigid Connectors in metal can be made by C asting, Soldering Welding

6. Cast Connectors They are shaped in wax as a multiunit wax pattern. Advantages: Convenient and minimize the number of steps involved in lab fabrication. Disadvantages: Fit of individual retainers may be adversely affected due to distortion of wax pattern

7. Soldered Connectors They use an intermediate metal alloy whose melting temperature is lower than that of parent metal. Indications - there is distortion in a single-piece fixed partial denture casting Disadvantages: Due to dirt or surface oxides the solder does not flow at the solder joint making it weak.

8. Welding method Here connection is created by melting adjacent surfaces with heat or pressure.

9. Soldering The filler metal has a melting point below 450 deg C (842 deg F). Brazing The filler metal has a melting point above 450 deg C (842 deg F).

10. NON RIGID CONNECTORS

11. Indications In cases where single path of insertion cannot be achieved due to non parallel abutments. These connectors allow limited movement between retainer and pontic .

12. Tenon Mortise Connectors It consists of tenon (male component) prepared within the contours of the retainer and a mortise (female component) attached to the pontic . Placement: Mortise is placed on the distalaspect of the pier abutment

13. Design of mortise (Female component): Accurate alignment of the dovetail or cylindrically shaped mortise is crucial. It must be parallel to the path of placement of the distal retainer. Paralleling can be achieved by dental surveyor.

14. Design of Tenon (Male Component): Fabricated by autopolymerising resin and attached to the pontic . Prefabricated plastic component of the mortise and tenon of a non rigid connector.

15. Loop Connectors Indications: When an existing diastema is to be maintainted in a planned FPD. Consists of a loop on the lingual aspect of the prosthesis that connects adjacent retainers or pontics . Design : Cast from platinum gold palladium alloy wire.

16. Split Pontic Connectors Indications: Used in cases with pier abutment. Design : Connector is incorporated within the pontic . T he pontic is split into mesial and distal segments. Each of these are attached to their respective retainers.

17. Design : The mesial segment is fabricated with a shoe/key. The distal segment is fabricated with a key way to fit over the shoe. The two components are designed by aligning in a surveyor.

18. Cross Pin and Wing Connectors Indications: Used in cases with tilted abutments. Design : The wing is attached to the distal retainer. The wing along with the distal retainer are termed as the retainer wing component .

19. Design : The pontic is attached to the mesial retainer and is designed to fit to the wing in the retainer wing component. The pontic along with the mesial retainer is termed as Retainer Pontic Component.

20. Design : After fabricating the retainer wing and retainer pontic components, they are aligned on the working cast and the 0.7 mm pin hole is drilled across the wing and pontic using a drill.

21. Thank You