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CAD/CAM - international magazine of digital dentistry

I technique _ monolithic posterior tooth restorations _Finishing: brush infiltration In the brush technique, the milled structures (crowns) are infiltrated with a colouring liquid (Zenostar Color Zr, Wieland Dental). In this process, the restorations acquire a lifelike appearance, showing a tooth-like progression of shade, already before the sintering procedure. All the A-D shades can be reproduced with these colouring solutions. Five additional characterization stains are available. In the case at hand, the bar joints were removed from the milled crowns 26, 25 and 35 by grinding, and the surfaces were smoothed (Figs. 9a & b). Sub- sequently, the colouring liquid was selectively brushedonthecusptips,aroundthemarginsandin deep fissures (Figs. 10a to 11b). The charm of this colourless liquid lies in the fact that it can be made visible. For this purpose a drop of colour concentrate (Zenostar VisualiZr, Wieland Dental) is added to the solution. As a re- sult, the individual liquids can be easily distin- guishedfromeachotherwhentheyarebrushedon the restoration. The colouring material is com- posed of organic pigments which fire without leaving any significant residue. Next, the restora- tions were sintered at 1,450°C (Zenotec Fire P1, Wieland Dental). After the sintering process, the crowns appeared lifelike and showed a warm and natural glow due to the reddish zirconium oxide used. Only a few minor adjustments had to be made on the basis of the inspection on the model. As a result, this approach not only ensures savings in terms of time and money, but it also heightens quality assurance. At this stage—before the staining materials were applied—the zirconium oxide crowns were polished and the surfaces were smoothed (Fig. 12). This effectively counteracted the common con- cern of abrasion. Before the crowns were fired, a glaze (Zenostar Magic Glaze, Wieland Dental) was sprayed on theirsurfacesinordertoestablishanevenbasefor the application of the staining materials. Stains in paste form (Zenostar Art Module Pastes, Wieland Dental)wereusedtocharacterizetherestorations. The pastes had to be mixed to a soft, smooth con- sistency before they could be applied. The cervical and incisal areas of the restorations were individ- ualized with the stains (Fig. 13). A film of glaze was sprayed on the restorations (Fig. 14) before they were fired. The combination of the stains and the lightly fluorescent spray glaze produced a three- dimensional effect. Figs. 11a & b_Brush infiltration: The colouring liquid is applied on the cusp tips and in the fissures. Fig. 12_The occlusal surfaces are polished before the stains are applied. 24 I CAD/CAM 2_2015 Fig. 11a Fig. 11b Fig. 12

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