Bar Designs

1
Hader
Spark Erosion
Round
Andrews
Dolder
Bar Designs
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
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 OverdentureAdvantages

• 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 OverdentureDisadvantages

• More costly
• More technique sensitive