Full-porcelain dental elements consist of dental porcelain (porcelain indicating a substantial-firing-temperature ceramic), other ceramics, sintered-glass materials, and glass-ceramics as oblique fillings and crowns or metal-free of charge "jacket crowns". These restorations are quite strong, durable and resistant to use, for the reason that the mixture of porcelain and metallic results in a stronger restoration than porcelain used alone.