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Potassium (sodium) alginate + calcium sulphate dihydrate + water → calcium alginate + potassium (sodium) sulphate. Sodium phosphate is added as a retarder which preferentially reacts with calcium ions to delay the set of the material. Alginate has a mixing time of 45–60 secs, a working time of 45 secs (fast set) and 75 secs (regular set).
Sodium alginate is used as an impression-making material in dentistry, prosthetics, lifecasting, and for creating positives for small-scale casting. [citation needed] Sodium alginate is used in reactive dye printing and as a thickener for reactive dyes in textile screen-printing.
A variety of materials can be used for both the molding and casting stages of the lifecasting process. For moulding, alginate and plaster bandages are the most popular materials. Different alginate formulas are available with different setting times and working properties. Choosing the correct formula can make the job much easier.
The practice of moulage, or the depiction of human anatomy and different diseases taken from directly casting from the body using (in the early period) gelatine moulds, later alginate or silicone moulds, used wax as its primary material (later to be replaced by latex and rubber). Some moulages were directly cast from the bodies of diseased ...
A tooth mold is obtained by filling the alginate negative [15] with buff stone, then the buff stone is used to fit the grill to the unique set of teeth. [14] However, for inexpensive novelty grills, a jeweler may make an impression by having the wearer bite into dental putty or wax softened in water, or the wearer may do this themselves.
Originally to fabricate an oral application, an alginate impression or a wax registration is used to fit the teeth with the mold. With new advances, doctors can take a scan of the dental arches to correctly and quickly make a mold out of silicone for the patient. This allows for better accuracy and more acute customization of the mold in the ...