50. Fixed partial dentures with cantilevers. Bridge restorations with special retainers.
Explains cantilever bridges, where the pontic is supported on one side only, and why the abutment beside the gap acts as a fulcrum that loads the cement. It sets out the conditions that make a cantilever safer, with a diagram and typical uses such as the upper lateral incisor and spring cantilevers. It then compares special retainers and connectors in a summary table, and closes with immediate and implant-supported bridges.
Topic 50 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 283 words (3 min of reading), with 14 flashcards.
In this note
Cantilever bridges (fixed-free)
Bridges with special retainers and connectors
Immediate bridges
Implant-supported fixed bridges
Cantilever bridges (fixed-free)
In a cantilever bridge the pontic is attached to abutments on one side of the gap only; its other end is free. It saves preparing a tooth, but it is potentially destructive, because the pontic acts as a lever.
In a fixed-fixed bridge, a force on the pontic is shared by the abutments at both ends.
In a cantilever, the abutment next to the pontic becomes a fulcrum: it is pushed down and tipped toward the gap, while the far retainer is pulled away from its tooth, putting tension on the cement.
Making a cantilever work
Strong abutments with long roots and healthy periodontium; usually two splinted abutments.
Only one, small pontic, narrower than the lost tooth.
Light contact in centric occlusion and no contact in side movements.
Rigid connectors and well-retained full-coverage retainers.
Typical uses
An upper lateral incisor held by the canine (forces in front are light).
A first premolar held by splinted second premolar and first molar.
A spring cantilever: an upper central incisor carried by a long, slightly springy palatal bar from premolar or molar abutments, used where a gap (diastema) is to be kept or the neighbours mustn't be prepared.
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