Please activate JavaScript!
Please install Adobe Flash Player, click here for download
ePaper created 2018-01-31, 10:01:59 | version 1.38.0
industry report | Fig. 12 Fig. 13 Fig. 14 Figs. 12–14: The implant model for manufacturing the final restoration (transverse screwed bridge). Manufacture of the final restoration The postoperative progress was free of problems. The patient was able to participate in social activities without restriction during the healing phase. Osseo integrated im- plants and stable hard- and soft-tissue conditions were seen after three months. Following a pick-up impres- sion, the temporary restoration was removed and the im- plant situations were modelled using an individual tray (Figs. 12–14). A screwed restoration was also planned for the final dental prosthesis. The framework made from non-precious-metal alloy (NEM) should be veneered us- ing a high-quality composite material. In order to give the aesthetic design ample space, transverse screwing (bolt- ing) of the dental prosthesis with the implants was con- sidered. In principle, a restoration screwed onto implants places a high demand on the framework fit. In complex restorations of this type, this involves a considerable chal- lenge in the production procedure. Due to the implant’s rigid bond with the bone, even a low amount of force can cause considerable dis placement of the implants. The highest level of precision is required from both the dentist and the dental technician. Digital manufacturing technologies come into play here. These offer a perfect framework fit and a high material quality—the icing on the cake is that production is also efficient. In the CAD soft- ware, the data relating to the pick-up impression is super- imposed on the data relating to the implant master model (matching) and a framework is constructed in a smaller anatomical crown shape. In the software, the bonding el- ements for the transverse bolting were integrated in the framework (Figs. 15–17). CAM milling of the NEM frame- work was carried out in the laboratory’s own high-per- formance milling machine. The thread for the transverse bolting was then incorporated within the cavity incorpo- rated in the bridge framework (Fig. 18). A framework try-in in the mouth confirmed that this was the perfect fit. The individual veneering of the restoration was carried out using pre-fabricated veneers (novo.lign, bredent medical). The veneers were fixed to the frame- work with a dual-hardening adhesive and the individual fine touches were added with a veneer plastic (crea.lign, bredent medical). The multiple-layer veneers (high-im- pact PMMA composite) and the light- curing composites support the simple manufacture and the individual, aes- thetic characterisation. In order to achieve efficient pro- gress, the cushioning properties against chewing pres- sure of the composite are combined, which are important to consider, particularly in implant prostheses. Fig. 15 Fig. 16 Fig. 17 Fig. 15: CAD construction with the bonding elements for the transverse bolting. Fig. 16: Digitalised set-up. Fig. 17: Construction of the framework in a smaller, anatomical crown shape. CAD/CAM 1 2018 29