Techceram Process Work at TCC TTC receives the sectioned, die relieved model. 1. The model is put through contract review, assessed for undercuts and blocked out if necessary. 2. Tooth coloured die spacer is applied if required. 3. The model is duplicated with Techsil Silicone liquid in a plastic casting ring former and spray refractory model is cast. 4. The base layer is manufactured by "Flame Spraying" specialist grade alumina powder onto the spray refractory model. The base layer is sprayed to a thickness of 0.5 mm. 5. The spray refractory is removed using glass bead blasting to leave the alumina shell together with over-spray which forms a support base during sintering. A specialist colouring glass is applied as a slurry. A choice of 10 shades are available to complement Vita™ Classical and 3D shade guides. The base layer is then sintered at 1170°C for 60 min to yield a translucent, coloured, high strength base layer. Due to the nature of the microstructure the inner fitting surface is still rough, hence optimising the bond between base layer and cement. 6. Excess glass is removed using alumina grit blasting. 7. The over spray used as a support during sintering is removed using a medium plus profiler. The base layer is trimmed using a fine plus profiler, to just inside the margin, to allow a porcelain margin to be formed which can interface with the gingival tissue. Use of a margin porcelain is not necessary. The fit of the base layer is checked on the die supplied. The plus profilers act to prevent build up of heat and also prevent chipping, which can occur with bonded diamond burs. 8. Contract review is completed. The base layer together with the original die are dispatched to the Laboratory in a presentation box.