Pressed glass-ceramics

EFFECTS OF MICROSTRUCTURAL ANISOTROPY ON FRACTURE BEHAVIOR OF HEAT-PRESSED GLASS-CERAMICS AND GLASS-INFILTRATED ALUMINA COMPOSITES FOR DENTAL RESTORATIONS... 

Effects of Microstructural Anisotropy on Fracture Behavior of Heat-Pressed Glass-Ceramics... 

E2 Ivoclar Vivadent / IPS Empress 2 Heat-pressed, glass-ceramic with lithium disilicate, used as core material in crowns and bridges... 

Figure 4-33 Schematic diagram of a glass-ceramic crown of IPS EMPRESS leucite glass-ceramic. Pressed glass-ceramic (dentin), sintered ceramic with opal glass-ceramic (incisal), and glaze.

The pressed glass-ceramic is derived from the basic Si02-Li20 system. It contains a lithium disilicate, Li2Si20j, as main crystal phase. The most important additions are oxides, such as ZnO, P2O5, BC2O, and The... 

Figure 4-39 Flexural strength of pressed glass-ceramic IPS EMPRESS 2 in comparison to other dental materials, natural tooth, and technical ceramics (Kappert 1998). a) ISO limit, b) tooth enamei, c) tooth dentin, d), e) ieucite-based ceramics, f) iPS EMPRESS , g) feldspar ceramic, h) mica glass-ceramic, i) sintered spinei and infiltrated glass, j) sintered AlgOg and infiltrated glass, k) IPS EMPRESS 2,1) dense sintered AI2O3.

Properties of Pressed Glass-Ceramic (Lithium Disilicate) of IPS EMPRESS 2 in Comparison to IPS EMPRESS (Layering Technique) (Leucite Glass-Ceramic) ... 

Figure 4-46 Micromechanical retention of the pressed glass-ceramic IPS EMPRESS 2 created after etching in 4.5% HF gel for 20 sec.

Reprinted, with permission, from M. Schweiger, et al., Microstructure and Properties of a Pressed Glass-Ceramic Core to a Zirconia Post. Quintessence of Dental Technology 1998, Chicago Quintessence, 1998, Fig. 5. 

Schweiger M., Frank M., Cramer von Clausbruch S., Hoeland W., and Rheinberger V., "Microstructure and Properties of Pressed Glass-Ceramic Core to Zirconia Post," Quint. Dent. TechnoL, 21, 73-79.(1998). 

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