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ePaper created 2018-04-25, 08:59:39 | version 1.38.0
B2 ◊Page B1 LAB TRIBUNE Dental Tribune Middle East & Africa Edition | 2/2018 Fig. 21: The bridge on the master cast. Fig. 22: Opalescence of the Celtra® Press matrix. Fig. 23: First dentin firing. Fig. 24: The object on the zirconia firing trays. Fig. 25: Veneering after the first dentin firing. Fig. 26: Completing the anatomical shape for the sec- ond dentin firing. Fig. 27: After the second firing, in transmitted light: Excellent light dynamics. Fig. 28: Close-ups of the bridge from the vestibular aspect. to examine their relationship with the TMJ, and a bridge was designed on-screen with due regard to articu- lation and occlusal relationships, something that presented a special challenge due to the end-to-end oc- clusion (Figs. 8 and 9). Finally, the bridge framework was reduced by 0.5mm in preparation for the cut- back and layering technique, and the contours were finished (Figs. 10 and 11). The framework was milled com- pletely in Cercon® base wax for the cut-back and layering technique (Fig. 12). In the present case, we produced two bridge frameworks to test the simple sprueing technique that uses only a single sprue for the pressing procedure (Figs. 13 and 14). Celtra® Press Investment, specially devel- oped for this new pressable-ceramic system, is characterised by very low viscosity, making it easy to pour into the investment ring and assuring a precise flow around the fine details of the object (Fig. 15). After setting, a 6g Celtra® Press pellet was placed on the muffle, which was then in- troduced into the pressing furnace. Divesting after pressing proved to be very easy and was achieved simply by removing excess in- vestment compound and sandblasting. One of the main advantages of Cel- Fig. 29: Completed bridge with antagonists. www.celtra-dentsplysirona.com CEREC® CAD/CAM Solutions Designed to simply work better together Celtra® D)o (ZLS) blocks, Prime&Bond )niversal™ Adhesive, and Calibra® Ceram Cement were designed to enhance and strengthen the individ)al benefits each of them provides, res)lting in an easy-to-)se system that streamlines the restoration process. Celtra Duo (ZLS) blocks • Restoration longevity of Celtra D)o (ZLS) is ens)red when )sed with Prime&Bond )niversal Adhesive and Calibra Ceram Cement • Firing is optional: choose either fire and seat or polish and seat Prime&Bond universal Adhesive • No need to )se a self c)re activator when )sed with Calibra Ceram Cement • Low film thickness to allow passive seating of the crown Calibra Ceram Cement • One-step c)ring when )sed with Prime&Bond )niversal Adhesive • 10-second tack c)re window and 45-second gel phase ens)res an easy, no-stress clean)p tra® Press and Celtra® Press Invest- ment is that virtually no reaction layer is present on the object after sandblasting, completely eliminat- ing the acid-etching step with hy- drofluoric acid (Figs. 17 and 18). After sandblasting, the framework exhib- ited a perfect surface without any re- action layer; all details of the objects had been reproduced meticulously (Fig. 19). No finishing was required beyond cutting off the sprue. The initial fit of the framework was excellent (Figs. 20 and 21). The out- standing aesthetic properties mani- fested themselves when transmit- ting light through the Celtra® matrix on the cast (Fig. 22). The framework was veneered with dentins and enamels in two firing cycles (Figs. 23 to 27). Both the fit of the bridge and its aesthetic appearance were as im- pressive on the master cast as they appeared intraorally during the try- in (Figs. 28 to 30). Both the patient and attending dentist were amazed at the result. Summary The case presented here describes the rehabilitation of an aesthetically compromised mandibular anterior tooth that had been lost to periodon- tal disease, with a delicate bridge design. This had become necessary because the patient had rejected im- plantological treatment followed by a single-crown restoration. The inherent challenge in the situ- ation was to create a restoration of excellent aesthetic quality while at the same time ensuring sufficient strength to guarantee a stable result for many years. This balancing act was successfully achieved with the new pressable-ceramic system Cel- tra® Press, because this zirconia-rein- forced lithium silicate offers excep- tional material properties not found in conventional lithium disilicates. This new material with its clear trans- lucence combines superior aesthet- ics with a strength that nevertheless exceeds 500 MPa — a value that no other lithium silicate can top. The result of the treatment was thrilling for the dentist and the patient alike. For more information on how the Celtra® Press System can benefit your lab, please contact your local Dentsply Sirona representative.