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Development Situation of Press Lithium disilicate

The casting lithium disilicate developed in recent years has brought great benefits to dentists and patients. As we all know, the purpose of tooth restoration is to use a material that is consistent with enamel in shape, color and physical properties to repair tooth defects. Protect the prepared tooth tissue.

Although the early tooth restoration materials can restore the function ideally, it is impossible to meet the requirements of aesthetics, physical properties and biological properties at the same time. Ceramic materials have been used in dentistry for nearly 200 years because their color is similar to natural teeth, but special skills are required to restore their shape in operation, and in order to overcome their brittleness, modern tooth restorations have combined metals to increase their strength. However, when the metal is covered with an opaque layer, it will cause scattering and reflection of light, which often appears too bright compared with the adjacent teeth of the natural dentition; on the other hand, the composite resin material can achieve good aesthetic effects, but it‘s Both color stability and abrasion resistance were poor.

Glass ceramics were first invented by the Coming Glass Company in the late 1950s. This kind of glass-ceramic is formed in the state of glass melting to obtain the prototype of the desired product, and then the glass body is subjected to microcrystallization heat treatment, that is, by controlling a certain temperature and its change, crystal nuclei appear inside the glass body, and Further crystallization, and finally part or all of the product is transformed from a glass phase to a crystalline phase, so glass ceramics are also called glass-ceramics. The composition of this glass-ceramic is similar to ordinary ceramics, and has the properties of ceramics, such as good biocompatibility, stable physical and chemical properties, etc., but its strength is more than twice that of ordinary ceramics, several times or even dozens of times higher than ordinary glass In particular, this material overcomes the brittleness of ordinary ceramics and glass. Since then, many scholars have devoted themselves to introducing this material into the field of oral restoration. In 1968, Macculloch and other scholars first applied glass ceramics to the dental field. They used a kind of glass to make inlays and crowns with casting technology combined with microcrystallization heat treatment. Since then, there have been many reports about the application of glass-ceramic materials in crown restoration. In 1984, Coming Glass Company and Dentsply Dental Equipment Company launched a castable ceramic based on eight silicon mica called Dicor. Dicor casting ceramics adopts the lost wax casting technology, which can accurately reflect the shape of the tooth body. The restoration has good suitability, easy to adjust the shape, beautiful and natural color, and good biocompatibility.

Japan also began to study the restoration of dental ceramic materials by casting in the late 1970s. In 1984, Toshio Jui and others reported the use of mica-based glass ceramics to make posterior inlays, full crowns, and anterior tooth veneers; in 1985, the Hobo and Ky-ocera bioceramics group developed a castable phosphorite named CeraPearl Stone glass ceramics whose composition is very similar to natural enamel. Domestic scholars started research on dental casting glass ceramics in the mid-1980s. Shi Shujun, Lu Anxian, etc. developed casting glass ceramic materials similar to Dicor, and relied on Dicor's supporting equipment to make oral restorations. Zhao Yunfeng and others have developed Plat casting ceramics and its supporting materials and equipment. At present, there are two main types of dental casting ceramics: one is mica-based casting ceramics represented by Dicor, the glass body contains more SiO2 before crystallization, and the product after crystallization is mica; the other is phosphoric acid represented by CeraPearl. Calcium crystal glass-ceramic has more vitreous body before crystallization, which belongs to phosphate glass, and the product after crystallization is apatite crystal.

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