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Explore various bar designs like Ovoid, Double, Rectangular, and custom milled options to enhance the stability of prostheses. Learn about Intra-Bar and Extra-Bar connections, Circum-Bar attachments, and the advantages and disadvantages of Bar Overdentures.
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Hader Spark Erosion Round Andrews Dolder Bar Designs Ovoid Custom Milled Double Bar Rectangular Branson Square
Attachments and Bars • Intra Bar • Extra Bar • Circum Bar
Extra Bar Attachment placed on the superior aspect of the bar • Increases strength of bar • Requires more interarch space
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
Circum-Bar Attachment wraps itself around the bar • Allows for rotation around bar
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
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
The Bar OverdentureDisadvantages • More costly • More technique sensitive