Dental Tribune Asia Pacific Edition No.10, 2017

Dental Tribune Asia Paciﬁc Edition | 10/2017 TRENDS & APPLICATIONS 13 7 8 9 10a 10b 11a 11b 12a 12b Fig. 7: Preparing for the wash bake. Both the gingival and the tooth areas were covered with the relevant materials.—Fig. 8: Selection of the required dentine materials (IPS e.max Ceram).— Fig. 9: The framework prepared for the first build-up layer.—Figs. 10 a & b: The ceramic build-up was based on the specified layering diagram.—Figs. 11 a & b: The framework before and after the first dentine bake. Figs. 12 a & b: The veneered prosthetic gingiva. A 3-D design was fabricated and various materials of different colours were used. short drying time, it can be fired (Fig. 6). e.max Ceram Transpa clear wash bake was carried out. The furnace settings have to The recommended firing pro- be modified: gramme for the wash bake: Start temp. Drying time Start temp. Drying time 403 °C 8 min 403 °C 8 min prepared framework according to the layering diagram (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. Temp. increase End temp. Temp. increase End temp. 25 °C/min 960 °C 25 °C/min 750 °C The recommended firing pro- gramme for the first dentine bake: Holding time 1 min Vacuum 450–959 °C Holding time 1 min Vacuum 450–749 °C Wasf bake Owing to the low thermal con- ductivity of zirconium dioxide, the wash bake is indispensable. The veneering ceramic sinters di- rectly on to the framework sur- face, and a homogeneous bond to the fired ZirLiner is achieved. First, a wash bake was carried out in the pink aesthetic zone. The restora- tion was placed on to a firing tray and then fired (Fig. 7). Then the IPS Individual build-up of tfe wfite aestfetics The basic tooth shade for this restoration was A2. In order to achieve a unique and charac- teristic result, we individual- ised the ceramic materials and used other effects, such as Deep Dentin and Impulse, Intensive and opalescent materials (Fig. 8). We built up the ceramic on the Fig. 13: Situation after the first gingiva 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 ultra- sound water bath or using a steam cleaner. The shape was then completed using ceramic and a second dentine bake was carried out. The firing parame- ters were based on the first den- tine bake. Individual build-up of tfe pink aestfetics There are 13 IPS e.max Ceram shades available for the prosthetic gingiva design. With this variety, it is possible to al- most playfully recreate the gingiva. The system’s shade guide aids in finding the cor- rect shade. A natural reproduc- tion is based on the anatomical prerequisites. For example, the keratinised gingiva is recreated with light pink materials, as the blood circulation is natu- rally less in this area, whereas the mucogingival area is imi- tated using more intensive ma- terials (Fig. 12). With some skill, a 3-D gin- giva design is produced and then the bridge is fired. Again, the firing parameters are ad- justed and the temperature is lowered slightly. The presented case was also produced in this manner. The recommended firing pro- gramme for the first gingiva bake: Start temp. Drying time 403 °C 8 min Temp. increase End temp. 25 °C/min 745 °C Holding time 1 min Vacuum 450–744 °C For the second gingiva bake, the shape was completed and the furnace temperature lowered again by 5 °C (Fig. 13). After this bake, the restoration had a dis- tinct 3-D shape and a very natural appearance. The teeth had a good depth of colour and a warm trans- lucency. 13

Dental Tribune Asia Pacific Edition No.10, 2017

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