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Horix/Hader Bar Instructions
| The Hader Bar may be utilized for a one piece casting (FIG
1a-b) or placed between implants (FIG
1c).
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A wax try-in is done first to determine the best
esthetic and functional placement of the bar and clips (FIG
2).
Determine the path of insertion of the prosthesis.
Wax up the post-copings, or crowns.
Reduce the bar in height and length to assure a proper
fit between abutments. Grind the "skirt", or gingival part
of the bar, to relieve the papilla.
The minimum height of a Hader Bar is 2.5mm. Use the
Paralleling Mandrel for
constructions with multiple small bar sections. |
2 |
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3 Plastic-Wax |
4 Plastic |
| The Hader Bar is available in Plasti-Wax (FIG
3) and also
Plastic (FIG 4). The Plastic-Wax is very pliable and easy to contour to fit the
case (place in warm water to adapt), burns out much cleaner, and works well with fast set investments.
If necessary, fill up the space between the model
and bar with wax to provide for a pontic-like gingival contact. Attach
the bar to the abutments.. |
5 |
When spruing a Hader bar, it is recommended to sprue to either the
gingival of the bar, or outside the functioning area of the bar
(FIG 5). Spruing the occlusal of the
bar will necessitate rubber wheeling the retention part of the bar, thus
altering the size and fit.
Invest, burn-out, and cast. The bar is cast in any alloy of choice. |
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5a |
5b |
Finish and thoroughly polish the bar.
Do not remove too much material from the bar as this will considerably
reduce retention. After try in and a pickup of the bar in a new
impression, place the bar on the model (FIG 5a-b).
Place the Hader
Processing spacers over the bar. |
6 |
7 |
| Fully
seat the green processing spacers on the bar, and trim the spacers to the vertical height of the Hader Bar
(FIG 6-7). |
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Why use the Processing Spacers?
The width of the "tail" of the green processing spacers matches the widest
part of a Hader clip. This allows easy insertion and removal of the actual clip, and
more importantly provides a "tunnel" that is
wide enough for removal and insertion of the
prosthesis.
The left side of this picture shows the tunnel created using the processing spacer.
The flange of the clip has room to flex out over
the height of contour and engage
the Hader Bar.
The right side of this picture shows
the problems that may be encountered when not using the processing
spacer--the clip is locked in acrylic; the flanges of the clip are pressed
inward making clip wear very possible, and insertion very difficult or
even impossible without breakage. This clip can not
expand, or flex outward while going over the height of contour of the bar. |
8 |
9 |
| With the processing spacers in place on the bar, use
blockout wax, plaster, or blockout material of choice to blockout
the undercuts of the bar. Remember to cover the
upper free areas of the bar and abutments. Leave the processing
spacers free of any blockout material (FIG 8-9). |
10 |
11 |
| The Hader Metal housing (0.2mm thin) allows for an
accurate seating of the Hader clip along with easy clip insertion, removal, and
replacement (FIG 10). Seat the Metal Housings on to the green processing spacers
(FIG 11). Process the acrylic resin, and
finish the prosthesis as normal. After
polymerization, cut out the green processing spacers. Insert the final
Hader Clips with the Insertion
Tool. The clips must snap in audibly. |
12 |
13 |
| This cross-section clearly shows the function of the Metal
Housings (FIG 12). The Hader Clip, or female rider, is authentic Hader as can be seen by the
word "HADER" on the end. The yellow clip is normal retention, orange is
increased retention, and white is reduced retention (FIG
13).
Would you rather process over an analogue bar? Click here for
Reline/New Prosthesis instructions |
14 |
The finished prosthesis
Please note the tunnel provided by the green processing spacers and the easy insertion
of the clips due to the placement of the metal housings (FIG
14). |
T0024.REV.01
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