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ePaper created 2018-02-16, 11:17:41 | version 1.38.0
rehabilitation of edentulous maxilla industry report | Fig. 28 Fig. 29 Fig. 30 Design and milling bar The set-up, the upper model and lower model were scanned in order to design a 2° CAD bar, using the sil- icone keys indicating the volumes obtained from the teeth set-up for the correction of the third class as a reference. In this case, the vestibularisation of the bar was much more accentuated to follow the tilt pattern of the teeth set-up. In the design, three Rhein’83 threaded Micro Spheres and vertical frictional at- tachments distally were inserted. The STL file of the bar with the corresponding construction info file was inserted in the CAM with the set-up of the specific strategies for the connections and the attachments present. The bar was milled from a chrome-cobalt disk using the 5-axis dental miller Orotig Whitec 5.2 (Figs. 12–18). At the end of the milling cycle, the bar was detached from the milled wafer, the Sheffield test was per- formed, placing the bar on the model by pointing only one screw to the right and then to the left to verify the precision of the connections on the implants. The same test was performed in the oral cavity, with addi- tional fit tests using control Rx. The threaded sleeves were cemented with composite material in the appro- priate milled holes in the bar. As a result, the Rhein’83 threaded Micro Spheres attachments were screwed Fig. 31 Fig. 32 Fig. 33 CAD/CAM 4 2017 39