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ePaper created 2017-08-25, 17:58:13 | version 1.38.0
use of CBCT and CAD/CAM cone beam supplement | Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 5: Design of the framework visible from the palatal side. Visible abutments prior to the placement of telescopic crowns at the frontal section with abutments to be attached by means of screws at the lateral section. – Fig. 6: Design of the telescopic crowns placed onto the abutments at the frontal section. – Fig. 7: Project of the construction with transparency mode on. – Fig. 8: Ready-made construction on a virtual model. – Fig. 9: A planted scan of a temporary prosthesis (blue colour) on the construction design. – Fig. 10: Ready-made project of the supra-structure visible from the intragingival side. In order to prepare the bridge, a model was scanned and transferred onto a computer using software to design the bar (Fig. 1). The bar was designed by using special software in such a way that the whole design was transparent in the first phase so that the location of abutments and the position of the telescopic abut- ments at the frontal section could be visible (Fig. 2). The next phase involved the planning of the size and shape of the final teeth, which, as porcelain crowns, will be glued onto the construction (Fig. 4). For that purpose, it is very helpful if on the design of the bar, a scan of the patient's temporary model prosthesis can be planted. Having planned the proper shape and location of pillars for the porcelain crowns, the transparency was switched off (Fig. 3). The patient must first approve the wax-up, in aes- thetical and functional terms (Fig. 4). A computer pro- gramme for designing such constructions provides us with the possibility of viewing and designing the bar Fig. 11: Suprastructure cut out and transferred onto the model. Fig. 12: Test of the construction within the oral cavity—visible opening for screws. CAD/CAM 3 2017 51 Fig. 11 Fig. 12