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Dental porcelain consists mainly of silica (silicon dioxide, SiO2), potassium, and sodium feldspar. Some of the newer porcelains contain aluminium oxide (alumina), zirconium oxide (zirconia), or magnesium aluminium oxide (spinelle) as the main components. Porcelain can be classified according to fusion temperature: high fusing (1300°C), used for the manufacture of denture teeth; medium fusing (1101–1300°C), used for porcelain jacket crowns and inlays; low fusing (850–1100°C), used for metal ceramic and porcelain jacket crowns, inlays, and veneers; and ultra-low fusing (<850°C), used for titanium and titanium alloy crowns.

Subjects: Dentistry.

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