This article describes the preparation, impression taking, digital design, and cementation processes involved in the fabrication and placement of an IPS e.max CAD LT posterior crown restoration. Self-adhesive cementation materials can be used, and the new self-adhesive composite cement SpeedCEM (Ivoclar Vivadent, Amherst, NY) is particularly suitable for lithium disilicate restorations. Due to the high strength of the restoration, adhesive cementation using a separate dentin conditioner is not indicated as long as the ceramic thickness remains 1.5 mm or greater. The high translucency (HT) form is ideal for inlay and partial crown restorations. IPS e.max CAD is available in a low translucency (LT) version suitable for the fabrication of crowns and implant-retained restorations. Because stains and glaze are applied prior to the crystallization process, subsequent polishing is unnecessary. After a 20-minute crystallization/firing process, the material achieves its final physical state and obtains its excellent mechanical and esthetic properties. Available to dentists for several years, this ceramic is milled to the desired shape while still in its metasilicate or “blue” state (i.e., approximately 130 MPa). IPS e.max® CAD (Ivoclar Vivadent, Amherst, NY) is a lithium disilicate glass-ceramic that demonstrates a flexural strength of 360 MPa.
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