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Hader Spark Erosion Round Andrews Ovoid Dolder Bar Designs Double Bar Branson Custom Milled Rectangular 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 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 The Bar Overdenture Disadvantages • More costly • More technique sensitive
