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February 2009 | Dental Lab Products Pressing in full
The IPS e.max all-ceramic product line includes a high-strength, lithium disilicate material suitable for pressable fabrication techniques. As such, technicians can realize true simplicity and versatility when fabricating high-strength, esthetic metal-free restorations because the lost-wax pressing techniques they’re accustomed to can be used. Additionally, the IPS e.max Press material is optimal for satisfying various case needs, including those for esthetics, function, or strength. Whether the restorations are to be placed in the anterior or posterior segment or both, the IPS e.max Press material enables laboratory ceramists to provide dentists with solutions that can be conventionally cemented or adhesively bonded. Following are the laboratory procedures for using IPS e.max Press when fabricating restorations for a full-mouth reconstruction case. Shade match and blending of the optical properties was facilitated by the highly translucent nature of the material. The material’s inherent strength of 400 MPa was optimal for use in stress-bearing areas. This case involved restoring the upper and lower arches (teeth Nos. 2 through 15 upper arch; teeth Nos. 18 through 31 lower arch). The ingot shade selected was BL1, but the final shade of the restorations would be BL2. Note: The second molars were restored with gold onlays. The clinician performed the standard preparation, impression taking, and temporization protocols. At the laboratory, models were made from the impressions. 01 Wax the case to full contour, cut-back, invest, and press (Figs. A and B). 02 Press and fit the units to the original dies. Desprue, and complete additional cut-backs (Fig. C). 03 Apply IPS e.max Ceram White Blue powder on the mesial line angle to build up the restoration. Then, apply an assortment of dentin and incisal powders to build-up the mammelons (Figs. D and E): BL1 Body Dentin and BL1 Incisal (1:1); SI Yellow and BL1 Incisal (1:1); T Blue and BL1 Incisal (1:1). 04 Fire the units according to manufacturer’s instructions (Fig. F). 05 Layer BL1 incisal powder over the entire body of the restorations to achieve depth of translucency (Fig. G). 06 Fire the restorations a second time (Fig. H). 07 Complete final contouring according to the parameters outlined by the clinician (Figs. I and J). 08 Glaze and hand-polish the entire case (Figs. K and L).
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