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ePaper created 2015-05-14, 11:05:01 | version 1.38.0
technique _ monolithic posterior tooth restorations I After the final firing, the crowns did not appear any different from layered restorations. On the contrary, they looked very lifelike and showed a natural internal play of colour. In the next step, the occlusal contacts were checked in the articulator and the proximal contacts on the model. Then the crowns were sent to the dental practice for place- ment. _Seating of the restorations Teeth 25, 35 and 26 were suitably prepared for thepermanentrestorations.Unfortunately,theat- tempt to save tooth 26 failed. The buccal crown wall fractured when the long-term temporary was removed.Rightfromthebeginning,wewereaware of the fact that the remaining part of this tooth might not be strong enough to withstand the treatment. At this stage, therefore, it became quite clear thatthetoothcouldnotbepreserved.Consequently, the long-term temporaries were re-seated and a newtreatmentplanwaspresentedtothepatientfor tooth 26 on the basis of a detailed analysis. A few weekslater,thepermanentall-ceramiccrownswere cemented (SpeedCEMR) on tooth 25 and tooth 35. The plan was to replace tooth 26 with an implant- supported restoration at a later date. _Conclusion The monolithic zirconium oxide crowns on tooth 25 and tooth 35 were indiscernible from the other teeth (Figs. 15 & 16). The patient reported that she was able to chew comfortably and naturally. The CAD/CAMfabricationprotocolallowedthecrowns to be cost-effectively produced. The translucent material (Zenostar Zr Translucent) that was used in this case showed a high level of light transmission. Therefore, it offered the ideal basis for reproducing the optical properties of the natural teeth. The de- scribed approach will help to satisfy the rising num- ber of cost-conscious and aesthetically discerning patients, since it offers an attractive alternative to individuallylayeredceramiccrownsandcastcrowns made of precious or non-precious metal._ Figs. 13 & 14_The stains were applied and sprayed with another coating of glaze. Fig. 15_The zirconium oxide crown on tooth 25 immediately after it was placed. Tooth 26 was provisionally restored with a PMMA crown. Fig. 16_A suitable alternative to a veneered crown and a cast crown – the full-contour zirconium oxide crown on tooth 35. It smoothly blends into the surrounding dentition. I 25CAD/CAM 2_2015 DieterKnappe,CDT KnappeZahntechnikGmbH Weinstraße14 67889Schweigen-Rechtenbach Germany dieter.knappe@orange.fr CAD/CAM_contact Fig. 13 Fig. 14 Fig. 15 Fig. 16