Work Instruction COMFOUR®

41 OCCLUSALLY SCREW-RETAINED PROSTHETICS ON CAMLOG ® AND CONELOG ® BAR ABUTMENTS SOLDERING The bar elements are cut accordingly and in consideration of a joining gap that is as small as possible fitted between the bar bases. The bar compo- nents are mounted with residue-free burn-out plastic, the brown anodized lab prosthetic screws are loosened after curing and the bar lifted off the working model. Bar lab analogs (serve as soldering aids, stainless steel) are inserted in the bar bases and hand-tightened with light blue anodized and shortenable screws, hex, for bar abutments. The screws are available in different lengths. See also information on screw thread sizes M1.6 and M2.0 on page 9. With the bar prepared for soldering, a soldering model is fabricated in the conventional manner. NOTE The instruction manuals of the soldering material manufacturers must be observed! Fixated bar components Bar lab analogs (soldering aids) with bar and screws for bar abutment The soldering is carried out according to the instructions of the soldering material and solder manufacturers. To avoid possible deformation of the soldering model, we recommend preheating the soldering model in the pre- heating furnace at approx. 500–600 °C (932–1112 °F). The plastic burns uniformly by doing so. After preheating in the furnace, the embedded bar can be soldered. Then allow the soldering model to cool to room tempera- ture. The bar is devested in an ultrasonic bath and then cleaned of oxides and flux residues in an acid bath. TIP: To protect the edges when trimming/polishing, the bar bases can be attached to bar lab analogs or a polishing protection (see page 42). Fabricating the soldering model Screw, hex, for bar abutment, for open tray impression taking and soldering, can be shortened extraorally by 2.5 mm, titanium alloy (Ti6Al4V ELI) Length 10 mm 15 mm 20 mm Thread M1.6/M2.0 M1.6/M2.0 M1.6/M2.0 ART. NO. J4012.1610/2010 J4012.1615/2015 J4012.1620/2020 IMPORTANT NOTE Never use sandblasting to devest the bar; this would destroy the precise fit of the bar base on the implant shoulder!