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A positive reproduction of the form of a tooth or tooth preparation in a suitable hard substance on which inlays or crowns may be constructed. It is usually made out of metal or dental stone. Dies are usually created in the dental laboratory by pouring the hard material into an impression; they are usually removable from within a cast. Die stone is an alpha modified derivative of calcium sulphate hemihydrate formed by boiling gypsum in a 30% aqueous solution of calcium and magnesium chloride; this produces a hard material with compact particles capable of producing a high degree of accuracy during fabrication.

Subjects: Dentistry.

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