Principles of Attachment Selection for Implant Supported Overdentures
| Principles of Attachment Selection for Implant Supported Overdentures | Hamid Shafie, DDS* and George Obeid, DDS** |
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| • Use directional pins to determine the relation of supporting implants with each other. Snap the 0° directional pin (i.e. reference pin) that has the best trajectory relative to the ideal path of insertion for the overdenture onto the implant.
• Use that implant as a guide to choose the directional pins that will be parallel to the reference pin. There are three color-coded directional pins similar to the directional rings. (Fig. 19A) • After achieving parallelism of all of the directional pins choose the appropriate directional rings based on the color of the selected directional pins. • If none of the implants are positioned in the correct path of insertion, make a pick-up impression and a master cast. Then use a surveyor to determine the discrepancy among the trajectory of the supporting implants. • After choosing the proper directional rings, snap a metal housing that has been pre-loaded with a black female positioning cap onto each ball attachment. Note: The directional ring covers all of the undercuts. • However, if a flap surgery has been performed and the tissue has been sutured, we recommend using a rubber dam to protect the sutures. Cut a small square of the rubber dam (½ inch X ½ inch) and punch a small hole in the middle of the square. The ball attachment and the hex of the implant should pass through the rubber dam hole. Make sure the rubber dam seats |
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Volume 19.6 |
