The Four Basic Bridge Designs
Fixed-fixed bridge.
Fixed-movable bridge.
Cantilever bridge.
Spring cantilever bridge.
A) Fixed-fixed Bridge
A fixed-fixed bridge has a rigid connector at both ends of the pontic. The abutment teeth are therefore rigidly splinted together, and for a conventional bridge must be prepared parallel to each other so that the bridge, which is a minimum of three units, can be cemented in one piece.
The retainers should have approximately the same retention as each other to reduce the risk that forces applied to the bridge will dislodge one retainer from its abutment, leaving the bridge suspended from the other abutment.
To minimize this risk, it is also important for the entire occluding surface of all the abutment teeth for a conventional bridge to be covered by the retainers.
The opposing teeth cannot then contact the surface of an abutment tooth, depress it in its socket and break the cement lute.
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30 июн 2024
