PREAT Precision Attachments

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Preci Clix Instructions for Ball Retained Overdenture Attachments

Dentist Direct Placement Technique #1293 / 1297

In one appointment, an existing removable partial denture may be converted to a Preci Clix retained overdenture.

Benefits

Economical: Inexpensive components; no lab fees.
Efficient: Simple and Easy to fabricate and service.
Small Size: 2.25mm Ø sphere -- total vertical space required is 4.0mm
Reduced Wear: easy insertion and removal with the ability to parallel the females with non-parallel males.





1227, 1228, 1229 burs	1293 Clix Male & Post	Large Tin Spacer	1251B Space Maintainer


1222 Insertion Tool	Female Retention Caps Yellow=standard White = reduced Orange = increased	Metal Housing for female retention caps	1201D Ball Analogue

Preci Clix Instructions for Ball Retained Overdenture Attachments

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Preparing the Root and Placing the Post: Following the endodontic treatment, the canal is prepared with the 1227 predrilling bur( Fig 1). The 1228 cavity bur is used next to prepare the canal for the base of the 1291 post ( Fig 2). Finally, the 1229 precision reamer is used to calibrate the canal for the diameter of the 1291 post (Fig 3). When using the burs, proceed at slow speeds.

Sandblast the Preci Clix Post prior to cementation. Cover the post and root surface with bonding composite. Seat the post. After the composite is set, polish the root surface with a fine sandpaper disk. Topical fluoride is often used to prevent decay (Fig4).

Laboratory Processing of the Female Attachments

Impression:

Accurately make an impression of the ball attachment in the mouth (1). Take 1201D analogue, and re-index into the recess (2) created in the impression material. Pour up cast.

Use the 1222 Clix insertion tool to snap the Preci Clix female into the Clix housing. Placing the metal housing upside down on a flat surface makes seating the female easier to insert (3). Place the 1251B black rubber space maintainer over the large tin spacer and Ball on the analogued model. Place the complete female unit onto the Clix ball on the model (please note the 1251B space maintainer (4). Block out any undercuts. Process the Clix female into the denture.

Processing the Female:

Important: Use the large tin spacer

The large tin spacer is used over the attachment during processing to block out excess acrylic from locking in the attachment. The main reason for using the big spacer may be understood by viewing figures A and B. A Ceka overdenture attachment is used as an example.

Ceka attachment used for example

Figure A is an overdenture fabricated without the large spacer. This eliminates all movement of the prosthesis--it is a rigid attachment. As you can see, the denture base is in direct contact with the post and attachment (arrow). Forces are directed to the post and attachment.

Figure B is the same overdenture, only this time the large spacer was used. Using the large spacer allows for movement of the prosthesis--it is now a resilient (tissue bearing) attachment. During processing, the large spacer creates a free space between the prosthesis and the post and attachment to allow this free movement, and direct forces to the tissue. The greater the area the forces are spread over, the less force that is generated on the abutment.

Remove both the large tin spacer and black rubber spacer.

Figure 5 shows the finished prosthesis. Figure 6 shows the 3 different retentions of Preci Clix females: standard retention (yellow), decreased retention (white), and increased retention (orange).

Option 2: Chairside Pick-Up of the Female Attachments

Using the Preci Clix female insertion tool, seat the Clix female in to the metal housing (FIG 1). It is easier to seat when the housing is face up on a flat surface

Place the large tin spacer over the ball and contour the pliable tin spacer around the ball and gingival area (FIG 2 ). You may need to cut a slot in the tin spacer. View Figures A & B for a graphic explanation of the importance of using the large tin spacer.

Place the black rubber space maintainer (FIG 3 ) on the ball over the tin spacer (FIG 4)

4	Seat the complete female component over both the ball and both spacers (FIG 4 ). Block out any undercuts with Perma Block.

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6 wpeB.jpg (40422 bytes)

The prosthesis is relieved, and checked to make sure that there is no contact with the attachment or abutment (FIG 5). It is recommended to cut a "vent", or small channel in the lingual side of the prosthesis to allow excess acrylic to escape. A small amount of low viscous self-cure resin is placed in the relieved area of the prosthesis (FIG 6 ).

It is recommended to pick-up all attachment females simultaneously.

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8 wpeE.jpg (42367 bytes)

The prosthesis is seated in the mouth for approximately 6 minutes (FIG 7 ). Apply finger pressure only in the area of the attachments. Do not have the patient close or bite. After the acrylic resin has set, the metal housing is fixed in the prosthesis (FIG 8 ). Remove any excess resin. Also remove the tin spacer and black rubber spacer. The female may be easily changed in the metal housing to adjust retention.

Figure 9 shows the finished prosthesis. Figure 10 shows the 3 different retentions of Preci Clix females: standard retention (yellow), decreased retention (white), and increased retention (orange).

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