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CAD/CAM - international magazine of digital dentistry

I technique _ monolithic posterior tooth restorations _Introduction This article is written in celebration of zirconium oxide, a material which has firmly established itself in the dental laboratory over the past 15 years or so. If appropriately used, zirconium oxide restorations produce very strong and durable results. They also satisfy demanding aesthetic requirements due to their translucent properties. The following case study shows how monolithic zirconium oxide is ef- fectively incorporated into the digital manufactur- ing chain to produce highly cost-effective dental restorations without having to compromise on aes- thetics. In the case presented, a wax-up was crafted which served as a basis for fabricating a provisional restoration(TelioRCADforZenotec,WielandDental) and a permanent restoration (Zenostar Zr Translu- cent, Wieland Dental) with one digital data set and CAD/CAM milling equipment. _Preoperative situation Thepatientpresentedtothedentalpracticewitha fracturedceramicinlayrestorationintooth26which she wished to have replaced. The tooth had been re- stored many years previously. Since tooth 25 and tooth 35 were discoloured as a result of root canal treatment, they were included in the treatment plan. The existing tooth structure of tooth 26, which had been prepared to accommodate the inlay in the past, waspreservedtothebestpossibleextent.Thepatient had very high aesthetic expectations and wanted the explicit assurance that the crowns would look com- pletelynatural.Nonetheless,wedecidedtouseavery efficient fabrication method in which monolithic restorations are produced with translucent zirco- nium oxide (Zenostar Zr Translucent). Three options are available for fabricating monolithic restorations with this approach: Figs. 1 & 2_Manual waxing up of the crowns. Team players: efficiency and aesthetics Full-contour posterior restorations made with translucent zirconium oxide Author_ Dieter Knappe, Germany 20 I CAD/CAM 2_2015 Fig. 1 Fig. 2

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