1. Bar Designs Hader Spark Erosion Round Andrews Dolder Ovoid
Custom Milled
Double Bar
Rectangular
Branson
Square

2. Attachments and Bars
Intra Bar
Extra Bar
Circum Bar

3. Extra Bar Attachment placed on the superior aspect of the bar
Increases strength of bar
Requires more interarch space

4. Intra-Bar
Connection between the two components directs the forces of mastication closer to the crest of the ridge
Decreases lever arm mechanics on the supporting teeth
Bar strength may be compromised

5. Circum-Bar Attachment wraps itself around the bar
Allows for rotation around bar

6. This minimizes stress on the attachments
The Milled Bar
Main Advantage
Final prosthesis is extremely stable because lateral forces are best managed by an intimately fitting primary and secondary bar
This minimizes stress on the attachments

7. The Bar Overdenture Advantages
Increased stability and retention than an attachment retained overdenture
Accomodates a wide variety of implant angulations
Bar splints implants together
Provides better resistance to lateral forces when in function
Pose less of a chance of failure at
bone-implant interface

8. The Bar Overdenture Disadvantages
More costly
More technique sensitive