Fixed Moveable Fixed Partial Denture
Fixed Moveable Fixed Partial Denture, as we define before, is a partial denture (bridge) with a rigid connector usually at the distal end of the pontic and a moveable connector that allows some vertical movement of the mesial abutment tooth. The movable connector (precision or semi-precision attachment) resists both separation of the pontic from the retainer and lateral movement of the pontic.
The fixed and movable connectors can be reversed. But there are reasons why it should be fixed on the distal abutment and movable on mesial abutment. The retainer with the movable connector is smaller so it’s better in the more anterior tooth. Unseating of movable connector due to mesial drifting is also resisted if it’s on the mesial abutment.
The movable connector can be separated before the fixed movable bridge is cemented. It can be cemented as one unit or separately. If the FPD is cemented separately, the attachment should be protected from excess cement going into it.
It does not need full occlusal protection. Occlusal forces applied to the tooth surface not covered by the retainer will depress the tooth in its socket and there will be movement at the movable joint rather than rupturing of the cement.
There is also a design where the movable connector is in the pontic of the dental bridge and is usually a through and through pin and tube. This type of fixed movable bridge design is not commonly used because it is difficult to clean.
Jesus Lecitona, DMD
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