Incisal glass-ceramic materials

The Transpa material heightens the transmission properties of the dental product. These materials are either applied with the incisal material or layered on the incisal glass-ceramic. The Effect materials of IPS d.SIGN are opal glass-ceramics that produce an opalescent appearance (see Section 2.4.6). 

The most important properties of the dentin and incisal materials are shown in Table 4-19. The coefficient of linear thermal expansion plays an important role in the optimal joining of ious types of apatite-leucite glass-ceramics and the Zr02-rich opaquer, which are applied to the different metals. Therefore, CTE of the opaquer has been included as a comparative value in Table 4-19. A comparison of CTE of glass-ceramics and of the opaquer with that of metals clearly shows that the application of the glass-ceramic to the metal framework systematically builds up compressive strain. As a result, the finished dental product demonstrates surface tension and a controlled increase in strength, ensuring retention on the substructure. 

Some dental technicians choose to apply an additional veneer to the shoulder region of dental crowns and bridges. As a result, metal is no longer visible in the gingival region. Thus the metal is optimally masked. This tedmique requires that the shoulder material from the additional assortment of glass-ceramics be applied prior to the sintering of dentin and incisal materials. 

In terms of quantity, the incisal and dentin materials comprise the largest part of the apatite-leucite glass-ceramics of the IPS d.SIGN system. Their microstructure and properties are described in Section 2.4.6. The main applications of these glass-ceramics include dental crowns and multi-unit bridges. 

Apart from the dentin and incisal materials, the IPS d.SIGN system includes further glass-ceramics of the apatite-leucite type as well as special glasses. The additional assortment of materials comprises base-kit, deep-dentin-kit, margin kit, impulse kit (with Effect and Transpa), gingiva kit, essence kit, stains kit (with glaze), and add-on materials. These system... 

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