CDEN0210

I 15 special _ implants I cosmeticdentistry 2_2010 tory screws are inserted into the implant ana- logues (Figs. 5a & b). The cast is blocked out with periphery wax to act as formwork for the construction of the device (Figs. 6a–c). The wax should extend for at least one tooth on either side of the prosthesis. If no tooth is present distal to the prosthesis, then additional teeth are covered anteriorly to maximise stability of the device. The wax should also block out the full dimensions of the pros- thesis. I like to construct the mesial aspect of the device to be sufficiently wide and robust for a finger or thumb to be readily placed on this areaforstabilisingthedeviceduringpreparation of the access holes. The model and the screws are lubricated with either petrolatum or a water-based lubri- cant. Auto-polymerising or light-curing resin is adapted to the cast to cover the adjacent occlusal surfaces and encompass the screws in the implant analogues (Figs. 7a & b). I prefer to use GC pattern resin and in the later stage of polymerisation, I remove the screws be- fore they potentially become locked in the resin. Oncethematerialsets,itistrimmedandpolished (Figs. 8a & b) then checked for stability on the model. Additional material can be added if re- quired. If a stone model of the prosthesis is available, it is convenient to confirm the stability of the device and to assess that there is no contact between the prosthesis and the device (Fig. 9). The intaglio surface is adjusted as required to ensure appropriate adaptation. Fig. 7bFig. 7a Fig. 5a Fig. 5b Fig. 5c Fig. 6a Fig. 6b Fig. 6c