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Preci Bar (Dolder) System
Preci Bar components
Dolder Bar by Dr. E.J.
Dolder of Switzerland. Bar and sleeve attachment for retaining removable
partial dentures and overdentures. The pear, or ovoid, shape is used for a
resilient prosthesis. The U-shape is for a rigid or non-resilient
prosthesis.
Benefits:
- The U-shaped (rigid)
is abutment supported for maximum stability and strength.
- The pear shaped
(resilient) is the most tissue-born bar available, as it allows for both
vertical and rotational movement.
The Preci Bar may be soldered to post copings,
implant abutments, or crowns of precious or semi-precious alloys. The
Plastic-Wax Preci Bar may be cast with any dental alloy, including non-precious.
The Plastic-Wax bar is cast directly with the abutments. The following
instructions detail use of the pre-fabricated precious metal Preci Bar.
Click here for use of the
Plastic-Wax Dolder Bar Patterns.
1. Complete the cast of post copings, or abutment
crowns. For
implant constructions, the implant analogues must be provided with plastic or
castable metal cylinders.
2. Try in post copings, or abutment crowns, in the
mouth. Pick up post copings or abutment crowns in a full arch impression.
3. Prepare master cast and bite rim.
4. Record the bite, and complete wax set-up and
try-in in the mouth. Return wax set-up to the master cast. Make
plaster or putty labial, buccal, and occlusal keys or indexes. Remove the
keys or indexes and the wax set-up from the master cast.
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4 |
6. Position the bar according to
the desired path of insertion and connect to the cast abutment restorations
with sticky wax or acrylic resin (FIG 4). |
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5 |
7. Invest the abutment retainers
and bar in soldering investment. Solder and polish (FIG 5).
8. Reseat bar on master cast. Position and
adjust the sleeve to the available space. Round off the sharp ends.
The perforated retention may be slightly bent to accommodate the space
available between the sleeve and the teeth. If cutting away any of the
perforated retention, exercise care not to damage its spot weld to the
sleeve.
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6 |
9. When using the pear shaped, or
resilient, bar, seat the
brass spacer between the bar and the female sleeve. Position the
sleeve so that it contacts the labial surface of the bar. No spacer is
used with the U-shaped, or rigid, bar (FIG 6). |
7 |
8 |
| 10. Fill any space
between the bar and ridge with plaster and also bring the plaster halfway up
the height of the female sleeve (FIG 7-8). Remove the plaster
after polymerization. The segments are now free for activating. |
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9a |
9b |
| 11. Reposition the plaster keys or
indexes with teeth on the master model. Prepare the wax set-up of the
prosthesis for acrylic processing. Invest, finish, and remove the
space maintainer (if used). Any retention adjustment is completed by
inserting a small instrument between the acrylic base and clean female
sleeve (FIG 9a-b). |
T0025.REV.00
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