Pressing glass

A. R. Boccaccini, S. Atiq and R. W. Grimes, Hot-Pressed Glass Matrix Composites Containing Pyrochlore Phase Particles for Nuclear Waste Encapsulation, Adv. Eng. Mat. 5, 501-508 (2003). 

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... 

In cavity-compression molding the cold powder or mold material is placed under pressure in a heated mold. The process is also called hot pressing. Glass-fiber-reinforced, unsaturated polyester resins are processed by the heated-cavity-compression molding method. The vulcanization of rubber can also be carried out using this method. High-fidelity records are pressed out of the thermoplasts PVC or poly(ethylene-co-vinyl acetate), while cheaper records are injection molded. 

Glass is efficiently bonded with UV-aerobic acrylics, and replaces epoxies, anaerobics, or heat-fusing techniques. A manufacturer of pressed glass stemware required an adhesive that would resist repeated exposures to detergent and water while providing a faster cure rate than an epoxy bonding process. A transparent UV acrylic was developed that cured a 2-mil gap completely in 2.5 seconds under a 250-watt mercury lamp. It did not discolor on aging and was moisture resistant (Fig. 2). 

Button. Part of a piece of pressed glass designed to produce a hole when knocked out also sometimes called a... 

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) ... 

Wear characteristics are a particularly important property of dental materials, as these materials should not damage natural teeth. Some dental ceramics have been shown to be highly abrasive to antagonist natural tooth structure. Sorensen et al. (1999) examined this issue in the course of a six-month clinical study. Eight three-unit premolar bridges (of pressed glass-... 

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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