CAMLOG Hybrid Restorations

72 HYBRID RESTORATIONS WITH THE CAMLOG ® IMPLANT SYSTEM For fabrication of double crowns using the electroplating technique, the manufacturer's specifications must be observed. The preparation for the cast fabrication of double crowns occurs similar to the cone-telescopic crown technique. To prevent the caps from rotating, the abutments are lightly ground in oval form. The surface must be homogeneous. The space for the tertiary framework required to receive the secondary crowns can be tested at every phase of preparation with the silicone index with the denture teeth in position. FABRICATING SECONDARY COPINGS The secondary crowns or superstructure are then fabricated. The tension- free seat of the superstructure is of paramount importance for the long- term success of an implant-prosthetic restoration. We recommend bonding the secondary copings intraorally into the tertiary framework (passive fit). NOTES Electroformed secondary copings Electroforming is conducted as specified by the manufacturer. The CAMLOG ® abutments are inserted into a CAMLOG ® lab analog of the appropriate diameter and fixed with a CAMLOG ® lab screw. The thick- ness should be 0.2–0.3 mm. The special feature of the low layer thick- ness of the electroformed components and the resulting low stability of the secondary coping prevent direct polymerization in the acrylic den- ture base. For this reason, a tertiary framework must be fabricated over the secondary copings for reinforcement. Cast secondary copings The wall thickness of the secondary copings should be approx. 0.5 mm. Fabrication is similar to standard crown and bridge technique. CAUTION Do not mix up the CAMLOG ® abutments and secondary copings! We recommend a color buccal marker on the abutment, coping and work- ing cast. For information about "Fabricating a tertiary framework for double crown restorations", "Bonding of the secondary coping intraorally" and "Insertion of the prosthetic restoration", see pages 67–68. DOUBLE CROWN RESTORATIONS