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Dental attachments fabricated using direct casting (e.g., injection molding) of materials such as plastics or wax, allowing small tolerances (i.e., semiprecision attachments), which are designed to attach partial dentures (including overlay partial dentures also known as overdentures) to receptacles that are connected to an abutment such as a tooth, abutment crown, dental implant, or tooth-root stud. These attachments are typically two-component devices that attach to each other with a lesser degree of precision than precision attachments: one component is fixed to an abutment or is supported by tissue and the second component is attached to the partial denture base. Semiprecision dental attachments may be rigid or have several degrees of resilience according to the torque transmitted to the abutment; they are available as intra- and extracoronal devices according to the fixation site. Semiprecision dental attachments usually distribute the chewing forces better and provide better cosmetic results than conventional clasp attachments. Magnetic-coupled attachments are also available; they are usually simpler and less expensive than precision attachments.
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