PREAT Precision Attachments

Preci Ball Castable Male Instructions

Female

Plastic Burnout Male Pattern

Large Tin Spacer

1201 Mandrel

Activate/Deactivate Tool

1201D Analogue

Benefits:

Economical castable male pattern
Universal components
May be used for bar constructions, post and copings, or cast copings

Fabricating the coping

1	2	3
The abutment is prepared for either a post and coping (the Preci Post system is recommended), or a cast coping only. Accurate full arch impressions must be sent to the laboratory. Wax up the post-coping as low as possible (FIG 1). Use the 1201P Paralleling Mandrel to incorporate the castable sphere into the wax-up and parallel to each other(FIG 2). The occlusal surface must be at an angle of 90 degrees to the path of insertion (FIG 3).

4	5
Invest, sprue, and cast in the alloy of choice (FIG 4). Do not sandblast the casting when devesting, as this will leave a rough surface on the cast sphere. Use the Cup Bur (FIG 5) to finish the cast sphere. This bur will assure a smooth, spherical shape of the casting.

Indirect pick-up of female

6	7	8
The completed casting is sent out for try-in. The cast coping(s) should be picked up in a new impression and a new master model poured for processing the females. Take an impression with the male in place (FIG 6). The 1201D (FIG 7) analogue will index in the impression exactly where the male is in the mouth. Pour the model (FIG 8).

Processing the Female

9 post11.jpg (6570 bytes)

The ball in place in the mouth, or on a model (FIG 9). Place the large tin spacer (FIG 10) over the ball and contour the pliable tin spacer around the ball and gingival area (FIG 11) to pre-relieve the acrylic from contacting the cast coping. Be sure to use the big tin spacer.

Seat the Preci Ball female over both the ball and both spacers (shown in the mouth and model, FIG 12 and FIG 13). Use the 1211 Female Paralleling Mandrel to assure that the females are parallel.

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15 wpeB.jpg (40422 bytes)

Chairside: The prosthesis is relieved to allow room for the female component (FIG 14). Drill a "vent", or small channel in the lingual side of the prosthesis to allow excess acrylic to escape. Low viscous self-cure resin is applied (FIG 15) to pick up the female.

16 wpeD.jpg (36336 bytes)

Chairside: The prosthesis is seated in the mouth for approximately 6 minutes with finger pressure only (FIG 16). Do NOT have the patient bite into place, as this will displace tissue. The self curing or auto polymerizing acrylic resin is pressed into the cavity with a finger covered with vaseline. When the acrylic resin has set, the metal housing is fixed in the prosthesis (FIG 17). This allows the female to be easily changed.

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