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  • Cement dental materials, whose main components are phosphoric acid and zinc oxide, designed to produce a mechanical interlocking effect upon hardening inside the mouth. These cements consist of a basic powder (zinc oxide), an acidic liquid (phosphoric acid), and water that are mixed together in a viscous paste immediately before use, setting to a hard mass. Zinc phosphate cements have proper thermal and chemical resistance in the oral environment; they also should be resistant to dissolution in oral fluids. Zinc phosphate cements must be placed on a dental cavity liner or sealer to avoid pulp irritation. They are used in dentists\' offices as cementing medium of inlays, crowns, bridges and orthodontic appliances (e.g., bands, brackets), as intermediate bases, or as temporary restorative materials.
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