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Glass-Ceramics for Dental Restoration

While bioactivity is required of medical prostheses or implant materials that replace hard tissue in human medicine, other properties are required of the biomaterials used in restorative dentistry. This subject must be addressed initially to facilitate the understanding of the development of these materials as well as of their applications. [Pg.277]

These desired applications determine the main requirements to be fiilfilled in the development of glass-ceramics for dental applications. The main objective is to produce a new biomaterial, the properties of which correspond to those of natural teeth. The most important properties are mechanical properties, biochemical compatibility with the oral environment, and a degree of translucency, shade, opalescence, and fluorescence similar to that of natural teeth. An abrasion resistance similar to that of natural teeth must also be achieved. The new biomaterial must demonstrate higher chemical durability than natural teeth, to prevent it from being susceptible to decay. [Pg.278]

The following glass-ceramics fiilfill the above properties. Moreover, they even possess additional properties, such as favorable working techniques, that are important for both dentists and dental technicians  [Pg.278]

These glass-ceramics represent highly specialized materials in which the different sophisticated properties mentioned have been developed. Therefore, they are highly refined tailor-made products. Furthermore, the fabrication technique has also been optimized. This measure was necessary because patients have different requirements, and dental restorations (e.g., inlay, crown, or bridge) must be suited exactly to the clinical situation. As a result, special techniques were developed that can be applied in the dental laboratory. [Pg.278]

These biomaterials are an integral part of a system used to fabricate dental restorations. The system comprises the base material, the processing techniques, the methods for characterizing the materials, and the various applications. The properties, processing techniques, and applications will be described in detail for each of the following product groups to illustrate this system. Reference is made to the development of the materials and to the relevant parts in Chapters 1, 2, and 3. [Pg.278]


Figure 2-41 SEM image (etching 10 sec, 3% HF) of the microstructure of apatite-leucite glass-ceramic for dental restorations. Heat treatment of the glass powder at SSO C/I h and 1050°C/1 h. The apatite crystals measure approximately 0.1-0.5 and 1-2 pm in diameter. The leucite crystals measure approx. 2 pm. Figure 2-41 SEM image (etching 10 sec, 3% HF) of the microstructure of apatite-leucite glass-ceramic for dental restorations. Heat treatment of the glass powder at SSO C/I h and 1050°C/1 h. The apatite crystals measure approximately 0.1-0.5 and 1-2 pm in diameter. The leucite crystals measure approx. 2 pm.
Holand W, Rheinberger V, Frank M., and Schweiger M., "Glass-Ceramics for Dental Restoration," Bioceramics, 8, 299-301 (1995b). [Pg.345]


See other pages where Glass-Ceramics for Dental Restoration is mentioned: [Pg.490]    [Pg.277]   


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