Cast partial denture consists of a metal framework for retention, combined with tissue coloured acrylic and replacement teeth. Partial dentures are used when one or more natural teeth remain in the upper or lower jaw. There are three basic types namely precision attachment partial and semi-precision attachment partial. Precision attachment partial is a removable partial denture that is retained by intra-coronal, extra-coronal or stud attachments. This type of precision prosthesis can be tooth supported, tooth and tissue supported, tooth and implant supported or implant and tissue supported. Precision attachment partials are designed in conjunction with new crowns or implants when esthetic expectations, improved retention and stability are required. A precision attachment partial is retained with metal to metal mechanical interlocking parts that are machined or milled to extremely high tolerances. Semi-precision attachment partial is also retained in the mouth with mechanical interlocking parts. The components consist of a semi-rigid metal to metal or other semi-resilient material. These plastic patterns may be cast into the alloy of one's choice. A removable partial denture (RPD) is a denture for a partially edentulous patient who desires to have replacement teeth for functional or aesthetic reasons and who cannot have a bridge (a fixed partial denture) for any number of reasons, such as a lack of required teeth to serve as support for a bridge (i.e. distal abutments) or financial limitations. This type of prosthesis is referred to as a removable partial denture because patients can remove and reinsert it when required without professional help. Conversely, a "fixed" prosthesis can and should be removed only by a dental professional.
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