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ePaper created 2016-04-05, 09:23:03 | version 1.38.0
231_2016 case report _ implant restorations conductive silver using the airbrush method. Upon completion of the process, the galva- nised gold crowns were detached from the telescopes and the conductive silver coating was removed with a solution containing ni- tric acid. In the process, a highly accurate secondary structure was obtained. _Tertiary structure All of the components were repositioned on to the working model. Before the tertiary structure was fabricated, the electroformed crowns were covered in a thin layer of wax to create the space necessary for the cement that would later be used. The tertiary struc- ture was invested, cast in a cobalt–chromi- um alloy using induction casting technology and then finished. The tertiary structure was intraorally ce- mented on to the electroformed telescopes (Multi link Hybrid Abutment and Monobond, Ivoclar Vivadent) in order to obtain a ten- sion-free restoration (Fig. 11). _Aesthetic design The structure obtained was covered in an opaque light-curing laboratory com- posite (SR Nexco, Ivoclar Vivadent) in pink and white prior to finishing the prosthesis. Again, the silicone key was used as a guide. The SR Phonares II teeth were repositioned from the wax set-up to the framework. The occlusal parameters were checked again and then we proceeded to complete the restoration. In order to reconstruct the pink gingival portion, we used the IvoBase Injector system (Ivoclar Vivadent). First, the denture was invested in two specially designed flask halves using Type III and IV plaster. After removing the wax and iso- lating the plaster surfaces, we prepared an IvoBase capsule and placed it together with the flask into the polymerisation chamber. The IvoBase injection and polymerisation process is fully automated and takes about 60 minutes. Users can choose between two programme options. Running the standard programme takes about 40 minutes. If the RMR programme is additionally activated, the pressing time increases, as a result of which the monomer concentration is reduced to less than one per cent. This aspect is beneficial to patients because the risk of allergies and irritation of the mucous membrane is virtually elim- Fig. 14_The macro-texture and shade effect of the denture were individualised in a straight forward manner to achieve a result that is true to life. Fig. 15_The implant-retained overdenture in the patient’s mouth. Figs. 12 & 13_Detailed view of the completed denture: customised prefabricated teeth and soft-tissue parts. Fig. 12 Fig. 13 Fig. 14 Fig. 15