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Dental impression materials with elastic properties, whose main component is irreversible alginate hydrocolloid, designed to make an accurate negative reproduction of a given area of the oral cavity. These dental impression materials consist of soluble alginate, reactors (e.g., calcium sulfate) which cause the alginate to gel, and retarders (e.g., sodium, potassium sulfate) which prevent gelation from occurring too rapidly. Alginate dental impression materials with fast setting time are available; dust free and/or antimicrobial alginate products are also available. These dental impression materials are supplied in powder form, either in bulk or in measured portions packed in foil envelopes, pouches, or bags. They are used in dental offices for border molding, final impressions, partial and complete denture cases, and orthodontics.
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