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ePaper created 2018-02-16, 11:17:41 | version 1.38.0
restoration of the edentulous maxilla case report | Fig. 12a Fig. 12b The furnace settings have to be modified: Individual build-up of the white aesthetics Start temp. Drying time 403 °C 8 min Temp. increase End temp. 25 °C/min 960 °C Holding time 1 min Vacuum 450–959 °C Wash bake Owing to the low thermal conductivity of zirco- nium dioxide, the wash bake is indispensable. The veneering ceramic sinters directly on to the frame- work surface, and a homogeneous bond to the fired ZirLiner is achieved. First, a wash bake was carried out in the pink aesthetic zone. The restoration was placed on to a firing tray and then fired (Fig. 7). Then the IPS e.max Ceram Transpa clear wash bake was carried out. The recommended firing programme for the wash bake: Start temp. Drying time 403 °C 8 min Temp. increase End temp. 25 °C/min 750 °C Holding time 1 min Vacuum 450–749 °C The basic tooth shade for this restoration was A2. In order to achieve a unique and characteristic result, we individualised the ceramic materials and used other ef- fects, such as Deep Dentin and Impulse, Intensive and opalescent materials (Fig. 8). We built up the ceramic on the prepared framework according to the layering dia- gram (Fig. 9), using Build-up Liquids to mix the IPS e.max Ceram. We worked as closely as possible to the final tooth shape (Figs. 10 & 11) and then fired the restoration. The recommended firing programme for the first dentine bake: Start temp. Drying time 403 °C 8 min Temp. increase End temp. 25 °C/min 450–749 °C Holding time 1 min Vacuum 450–749 °C After firing, the bridge was trimmed and cleaned. This is ideally carried out in an ultrasound water bath or using a steam cleaner. The shape was then com- pleted using ceramic and a second dentine bake was carried out. The firing parameters were based on the first dentine bake. Individual build-up of the pink aesthetics There are 13 IPS e.max Ceram shades available for the prosthetic gingiva design. With this variety, it is Fig. 13 Figs. 12a & b: The veneered pros- thetic gingiva. A 3-D design was fabricated and various materials of different colours were used. Fig. 13: Situation after the first gingiva bake. CAD/CAM 4 2017 23