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ePaper created 2018-02-16, 11:17:41 | version 1.38.0
| case report restoration of the edentulous maxilla rial has a crystal structure similar to that of natural dentition and allows a speci fically adjustable combi- nation of translucency, brightness and opalescence. The framework (Zenostar T) is an ideal base for the ceramic veneer. The defined cut-back enables the framework to be veneered efficiently. The reduced tooth shape allows the veneering ceramic to be ap- plied in an even thickness. This ensures that the lay- ered ceramic is heated uniformly during firing. For the fabrication of the prosthetic gingiva, we chose IPS e.max Ceram Gingiva materials, with which we achieved a gingival area with a lifelike appearance. The materials were applied and fired in a similar man- ner to the dentine and enamel materials. Liner bake First, the ZirLiner bake was carried out using the IPS e.max Ceram ZirLiner, a material with multiple functions. On the one hand, the ZirLiner creates a strong bond between the veneer and the framework. On the other hand, it gives the restoration depth of shade and fluorescence. We do not recommend omit- ting the ZirLiner, as this can increase the risk of cracks and delamination. Before the ZirLiner is applied, the framework must be free from dust and dirt. Contam- ination must be avoided. The IPS e.max Ceram Liner should cover the framework completely; we recom- mend applying the material in uneven layers. After a short drying time, it can be fired (Fig. 6). Fig. 9 Fig. 9: The framework prepared for the first build-up layer. delamination. The exact fit of the restoration justifies the long firing time. It should be noted that the programmes must be adjusted accordingly before the ZirLiner bake (IPS e.max Ceram ZirLiner, Ivoclar Vivadent): · · long heating-up time long cooling-down time Figs. 10a & b: The ceramic build-up was based on the specified layering diagram. Figs. 11a & b: The framework Ceramic system and framework before and after the first dentine bake. Our preferred veneering material (IPS e.max Ceram) consists of low-fusing nano-fluorapatite. The mate- Fig. 10a Fig. 10b Fig. 11a Fig. 11b 22 CAD/CAM 4 2017