Nylon Clip Wear Assessment in Implant

"the master stone cast is scanned with external desktop scanner to produce an STL (Standard Tesellation Language) file for a virtual model using the CAD/CAM software (Medit 500i.). The design of the multiunit abutment and bar (Rhein Bar )was selected from the library of the CAD software. The bar dimensions were selected according to the study bar design .~After the data acquisition, the STL file was imported to the CAM part of the CAD/CAM system to mill PEEK bar from biological high-performance polymer (Bio-HPP) (BreCAM. BioHPP, Bredent GmbH \& Co.KG, Senden, Germany) block PEEK type. Multi-unit abutments were screwed to the implants and the PEEK bar was screwed to the abutments ."

Co-Cr metal bar group, in the master cast , the multiunit abutment were attached to the implant analogues and plastic abutments were adjusted , prepared and then wax pattern coping was customized on each abutment and was connected to a preformed castable bar 2.4mm Height, (Rhein 83) The bar was placed to be away from the anterior ridge by about 2-3 mm for proper hygiene measures. The wax pattern was then sprued and casted into cobalt- chromium alloy.