CAMLOG Hybrid Restorations

66 HYBRID RESTORATIONS WITH THE CAMLOG ® IMPLANT SYSTEM PROCESSING THE CAMLOG ® ABUTMENTS EXAMPLE OF THE CAMLOG ® UNIVERSAL ABUTMENT After fabricating the cast, the CAMLOG ® universal abutments are inserted into the CAMLOG ® lab analogs and fixed with the CAMLOG ® lab screw. A previously prepared silicone index is used to mark the height and axis alignments. The height of the abutments is first adjusted. The height of the circular func- tional surface must not fall below 5 mm, otherwise sufficient retention strength of the construction cannot be achieved. The uniform insertion direction is then determined and the abutments are machined with suitable abrasives in the parallelometer. The specified speeds of each abrasive used for titanium machining must be observed. Overheating the titanium leads to a very hard surface (alpha case layer) and should be avoided. For fabrication of double crowns using the electroplating technique, the manufacturer's specifications must be observed. Cast fabrication of double crowns are prepared similar to the cone telescopic crown technique. To pre- vent 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 THE SECONDARY CROWNS 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 in 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 denture 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. Check of the space conditions with the silicone index on the working cast DOUBLE CROWN RESTORATIONS