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Metal-ceramic restorations include the positive features of metal (strength, durability and stability) and ceramics (esthetics). ... Atoms of silica in ceramic are bound with these oxides as a result of which a metal-tracer-ceramic compound is formed and a chemical bond is realised.
    Porcelain is used for a wide range of household and industrial products. Sialon (Silicon Aluminium Oxynitride) has high strength; resistance to thermal shock, chemical and wear resistance, and low density. These ceramics are used in non-ferrous molten metal handling, weld pins and the chemical industry.