61. Bar attachments. Prefabricated cap-post attachments.
Covers bar and stud attachments for dentures supported by a few remaining teeth, roots or implants. It compares four bar types (Dolder, Hader, round and custom milled) in a table, lists design rules for bar position and space, and sets out advantages and disadvantages of bars. It then describes prefabricated ball-and-socket cap-post stud attachments and ends with overdentures on roots or implants.
Topic 61 of 75 in the MU Sofia syllabus for Preclinics of Dental Prosthetics (Dental Medicine, Year 2). The free AceMed note covers it in 4 sections, about 286 words (3 min of reading), with 15 flashcards.
In this note
Introduction
Bar attachments
Stud (cap-post) attachments
Overdentures
Introduction
When only a few teeth or roots remain, or implants are placed, bar and stud attachments let a denture rest on them for support, retention and stability, while the mucosa still carries part of the load.
Bar attachments
A metal bar is soldered or cast between two or more copings (crowns or root caps) or implant abutments. The denture holds a matching sleeve, clip or rider that snaps over the bar. Bars can be rigid (no movement: the denture is held firmly) or resilient (the denture can rotate or sink around the bar, sparing the abutments).
Design rules
The bar is straight between abutments and as close to perpendicular to the line bisecting the arch as possible, so the denture can rotate evenly.
Enough space under the bar to clean, without pressing on the mucosa.
Enough vertical space in the denture for bar plus sleeve plus teeth: shape of the ridge and available room decide the bar shape.
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