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CAD/CAM international magazine of digital dentistry

32 I I industry report _ CAD crown design thickness of 1.5 mm (Fig. 5). The minimal densifica- tion of the ceramic (0.2 vol.%) during the crystalli- sationprocessistakenintoaccountbythesoftware and adjusted accordingly. After the crown had been milled, the proximal and occlusal contacts were adjusted on the patient (Figs. 6 & 7). In this case, the white and creme ma- terials from the corresponding stain assortment (IPS e.max CAD Crystall./Stains, Ivoclar Vivadent) were sparingly applied to the cusp tips and the sunsetmaterialtothetoothneckandinthefissures. Immediately afterwards, a glaze in spray form (IPS e.max CAD Crystall./Glaze Spray) was applied to the outer surfaces of the crown. The spray was applied several times. Once the restoration had been fully coated with a white-opaque glaze layer, the crown was fired in a combined crystallisation and firing process in the Programat CS furnace (Figs. 8 & 9). Before the restoration was cemented in place, the inner surface of the crown was etched with 4.9 per cent hydrofluoric acid (IPS Ceramic Etching Gel, Ivoclar Vivadent) for 20 seconds. Subsequently it was silanised for 60 seconds (Monobond Plus, Ivoclar Vivadent). The crown lumen was filled with the self-adhesive SpeedCEM. Next, the crown was securely seated on the prepared tooth by applying even pressure (Fig. 10). The cement residue was polymerised for one second per surface (mesio-oral, disto-oral, mesio- buccal, distobuccal) with a curing light (bluephase in the low power mode, Ivoclar Vivadent) at a dis- tanceofabout5mm.Inthiscuredstate,thecement was removed with great care using a scaler and a probe. The cement was fully cured with the blue- phase in the high power mode. Subsequently, the cement margin was polished. The final inspection revealed the restoration to be in harmony with the overall situation (Figs. 11 & 12). Fig. 10_Cementation of the crown with the dual-curing, self-adhesive luting composite cement SpeedCEM. Fig. 11_Buccal view of the crown seated with a self-adhesive luting cement after the removal of excess. Fig. 12_Occlusal view of the crown seated with a self-adhesive luting cement. CAD/CAM 4_2012 Dr Andreas Bindl Station für Zahnfarbene und Computer-Restaurationen Praxis am Zürichberg Attenhoferstr.8a 8032 Zurich Switzerland andreas.bindl@bluewin.ch CAD/CAM_contact Fig. 12 Fig. 11Fig. 10