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1. At the time of implant uncovering, place a non-shouldered abutment and allow the soft tissue to heal around the hemispherical base of the abutment for 6 weeks. Choose the widest non-shouldered abutment that will support the interdental papillae without encroaching upon them.
2. Use a sharp #1557 carbide bur to modify the abutment, if necessary. Use irrigation when preparing the abutments intra-orally to prevent heating and potential damage to the bone.
3. Make a direct impression of the modified or unmodified abutment with conventional impression materials and pour a conventional stone model. The laboratory procedures are the same as for the fabrication of crowns or fixed bridges for natural teeth. Use a knife or feathered edge margin.
4. A try-in of the casting prior to the porcelain application is advised to assure a passive seating.
5. After any needed occlusal, interproximal, or aesthetic contouring, cement the crown conventionally with minimal cement only at the cervical aspect of the crown to avoid adverse hydraulic forces. Care must be taken to remove all extraneous cement.
6. Recheck the occlusion after cementation.
Note: Use irrigation when preparing the abutment intra-orally to prevent heating and potential damage to the bone.
A try-in of the casting prior to the porcelain application is advised to assure a passive seating.
A knife or feathered-edge margin is employed at the most apical portion of the die. The margin need not be at the abutment’s height of contour.
Statistically, a 2.0mm diameter abutment post will move 0.1mm into the well of an implant from its initial insertion to its being definitively seated, and a 3.0mm abutment will move 0.25mm.
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